diff --git a/.fallowrc.jsonc b/.fallowrc.jsonc
index 1bcd56387..41ba72dbe 100644
--- a/.fallowrc.jsonc
+++ b/.fallowrc.jsonc
@@ -397,6 +397,12 @@
     // require intrusive middleware changes beyond this PR's scope.
     "minLines": 6,
     "ignore": [
+      // AWS Lambda and GCP Cloud Run deliberately mirror the same distributed
+      // rendering lifecycle while retaining provider-specific SDK, storage, and
+      // retry semantics. The Plan v2 AWS adapter extends that existing symmetry;
+      // extracting a shared cloud abstraction would couple independent packages.
+      "packages/aws-lambda/src/handler.ts",
+      "packages/aws-lambda/src/s3Transport.ts",
       // sourcePatcher.ts: pre-existing internal clones between the inline-style
       // and attribute tag-patchers; only the PatchOperation type gained two
       // optional fields here, but the line shift makes fallow re-flag them.
diff --git a/bun.lock b/bun.lock
index f277c1224..9643719f3 100644
--- a/bun.lock
+++ b/bun.lock
@@ -43,6 +43,7 @@
         "esbuild": "^0.25.12",
         "tsx": "^4.21.0",
         "typescript": "^5.7.2",
+        "yaml": "^2.9.0",
       },
       "peerDependencies": {
         "aws-cdk-lib": "^2.130.0",
diff --git a/examples/aws-lambda/README.md b/examples/aws-lambda/README.md
index 65c8ed1da..7300ac141 100644
--- a/examples/aws-lambda/README.md
+++ b/examples/aws-lambda/README.md
@@ -75,6 +75,7 @@ aws stepfunctions start-execution \
   "ProjectS3Uri": "s3://${RENDER_BUCKET}/projects/my-project.tar.gz",
   "PlanOutputS3Prefix": "s3://${RENDER_BUCKET}/renders/$(date +%s)/",
   "OutputS3Uri": "s3://${RENDER_BUCKET}/output.mp4",
+  "PlanProtocol": "v1",
   "Config": {
     "fps": 30,
     "width": 1920,
@@ -91,6 +92,9 @@ EOF
 
 The Step Functions execution kicks off Plan, fans out RenderChunk via
 the Map state, and finally Assemble. Final mp4 lands at `OutputS3Uri`.
+`PlanProtocol` may be `"v1"` or `"v2"`; absent defaults to v1. V2 uses
+separate manifest and content-addressed artifact locators throughout the
+workflow and never places a v2 object in `PlanS3Uri`.
 
 ## Local invocation
 
@@ -119,13 +123,14 @@ the architecture works on a deployed Lambda — use the local smoke
 script:
 
 ```bash
-# All defaults (mp4-h264-sdr fixture, chunk counts 2/4/8, PSNR >= 40 dB).
+# Defaults use the fixture's meta.json minPsnr (30 dB for mp4-h264-sdr).
 ./scripts/smoke.sh
 
 # Customised:
 ./scripts/smoke.sh \
   --fixture mp4-h264-sdr \
   --chunk-counts 2,4,8,16 \
+  --plan-protocol both \
   --psnr-threshold 40 \
   --reserved-concurrency 8
 
@@ -141,7 +146,21 @@ per-run stack name, renders the fixture at each chunk count via the
 Step Functions state machine, PSNR-compares against the in-process
 baseline (which is git-LFS tracked under
 `packages/producer/tests/distributed/<fixture>/output/`), captures
-per-execution Step Functions history, and tears the stack down.
+per-execution Step Functions history, and tears the stack down. Use
+`--plan-protocol both` to run v1 and v2 through the same deployed Lambda
+package and baseline. Each v1/v2 pair is also gated directly on per-chunk
+hashes from Step Functions history, normalized decoded RGBA frame hashes,
+decoded 48 kHz stereo s16le PCM hashes and byte counts, normalized stream
+metadata, and duration. Encoded MP4 SHA equality is reported but is
+informational unless `--require-encoded-sha-equal` is set. The script
+assigns unique function/state-machine names, uses a
+dedicated temporary SAM artifact bucket, and removes render objects,
+retained buckets, the implicit Lambda log group, and deployment artifacts
+on teardown. Suspended-version buckets are purged in 1,000-entry batches,
+including concrete versions, null versions, and delete markers. It then
+verifies that the stack, both buckets, Lambda, state-machine, and both log
+groups are absent; an otherwise-successful run fails if cleanup cannot be
+proven.
 
 **Wall-clock methodology caveat (`eval.sh` only).** `eval.sh` reports a
 local-vs-Lambda "speedup" column. The local timing includes `bun` +
@@ -162,9 +181,11 @@ spend is roughly $0.10-$0.20 per pass before S3 transfer. Lower
 
 Outputs land under `<repo-root>/lambda-smoke-artifacts/`:
 
-- `results.json` — `chunkCount × wallClockMs × psnrAvgDb`
-- `renders/N<N>-output.mp4` — each rendered chunk count
-- `renders/N<N>-history.json` — full Step Functions execution history
+- `results.json` — `planProtocol × chunkCount × wallClockMs × psnrAvgDb`
+- `semantic-comparisons.json` — direct v1/v2 semantic gate results
+- `renders/<protocol>-N<N>-output.mp4` — each rendered variant
+- `renders/<protocol>-N<N>-history.json` — full Step Functions execution history
+- `renders/v1-v2-N<N>.*` — normalized frame hashes, ffprobe metadata, and comparison JSON
 
 Prerequisites: `aws` (v2), `sam` (≥ 1.100), `bun` (≥ 1.3), `ffmpeg`,
 `jq`, `zip`. AWS credentials come from the standard resolution chain
diff --git a/examples/aws-lambda/sample-events/assemble-v2.json b/examples/aws-lambda/sample-events/assemble-v2.json
new file mode 100644
index 000000000..bbb3bd2c2
--- /dev/null
+++ b/examples/aws-lambda/sample-events/assemble-v2.json
@@ -0,0 +1,11 @@
+{
+  "Action": "assemble",
+  "PlanProtocol": "v2",
+  "PlanV2ManifestS3Uri": "s3://example-bucket/renders/sample/v2/manifest.json",
+  "PlanV2ArtifactS3Prefix": "s3://example-bucket/renders/sample/v2/artifacts/sha256",
+  "PlanHash": "0000000000000000000000000000000000000000000000000000000000000000",
+  "ChunkS3Uris": ["s3://example-bucket/renders/sample/chunks/0000.mp4"],
+  "AudioS3Uri": null,
+  "OutputS3Uri": "s3://example-bucket/renders/sample/output.mp4",
+  "Format": "mp4"
+}
diff --git a/examples/aws-lambda/sample-events/plan-v2.json b/examples/aws-lambda/sample-events/plan-v2.json
new file mode 100644
index 000000000..7b7330b09
--- /dev/null
+++ b/examples/aws-lambda/sample-events/plan-v2.json
@@ -0,0 +1,15 @@
+{
+  "Action": "plan",
+  "PlanProtocol": "v2",
+  "ProjectS3Uri": "s3://example-bucket/projects/sample.tar.gz",
+  "PlanOutputS3Prefix": "s3://example-bucket/renders/sample/",
+  "Config": {
+    "fps": 30,
+    "width": 1920,
+    "height": 1080,
+    "format": "mp4",
+    "chunkSize": 240,
+    "maxParallelChunks": 8,
+    "runtimeCap": "lambda"
+  }
+}
diff --git a/examples/aws-lambda/sample-events/render-chunk-v2.json b/examples/aws-lambda/sample-events/render-chunk-v2.json
new file mode 100644
index 000000000..065ac4083
--- /dev/null
+++ b/examples/aws-lambda/sample-events/render-chunk-v2.json
@@ -0,0 +1,10 @@
+{
+  "Action": "renderChunk",
+  "PlanProtocol": "v2",
+  "PlanV2ManifestS3Uri": "s3://example-bucket/renders/sample/v2/manifest.json",
+  "PlanV2ArtifactS3Prefix": "s3://example-bucket/renders/sample/v2/artifacts/sha256",
+  "PlanHash": "0000000000000000000000000000000000000000000000000000000000000000",
+  "ChunkIndex": 0,
+  "ChunkOutputS3Prefix": "s3://example-bucket/renders/sample/",
+  "Format": "mp4"
+}
diff --git a/examples/aws-lambda/scripts/_aws-isolation.sh b/examples/aws-lambda/scripts/_aws-isolation.sh
new file mode 100755
index 000000000..36718d13a
--- /dev/null
+++ b/examples/aws-lambda/scripts/_aws-isolation.sh
@@ -0,0 +1,181 @@
+#!/usr/bin/env bash
+# AWS resource-name isolation and failed-deploy discovery helpers.
+
+hf_new_smoke_run_id() {
+  local seconds seed digest
+  seconds=$(date +%s)
+  seed="${seconds}:$$:${RANDOM}:${BASHPID:-$$}"
+  digest=$(printf '%s' "$seed" | sha256sum | awk '{print substr($1,1,16)}')
+  printf '%s-%s\n' "$seconds" "$digest"
+}
+
+hf_sam_deploy_bucket_name() {
+  local account_id="$1" region="$2" run_id="$3" digest
+  digest=$(printf '%s' "$run_id" | sha256sum | awk '{print substr($1,1,20)}')
+  printf 'hf-sam-%s-%s-%s\n' "$account_id" "$region" "$digest"
+}
+
+hf_derive_project_name() {
+  local stack_name="$1" prefix digest
+  prefix=$(printf '%s' "$stack_name" |
+    tr -c '[:alnum:]-' '-' |
+    sed -E 's/^-+//; s/-+$//' |
+    cut -c1-36)
+  [ -n "$prefix" ] || prefix="hf-smoke"
+  digest=$(printf '%s' "$stack_name" | sha256sum | awk '{print substr($1,1,12)}')
+  printf '%s-%s\n' "$prefix" "$digest"
+}
+
+hf_known_absent() {
+  local pattern="$1" output_file="$2"
+  grep -Eiq "$pattern" "$output_file"
+}
+
+hf_assert_command_absent() {
+  local label="$1" absent_pattern="$2"
+  shift 2
+  local output_file status detail
+  output_file=$(mktemp)
+  if "$@" >"$output_file" 2>&1; then
+    echo "ERROR: destructive-isolation collision: $label already exists" >&2
+    rm -f "$output_file"
+    return 1
+  else
+    status=$?
+  fi
+  if ! hf_known_absent "$absent_pattern" "$output_file"; then
+    detail=$(tr '\n' ' ' < "$output_file" | cut -c1-240)
+    echo "ERROR: could not prove $label absent (exit=$status): $detail" >&2
+    rm -f "$output_file"
+    return 2
+  fi
+  rm -f "$output_file"
+}
+
+hf_assert_named_list_absent() {
+  local label="$1"
+  shift
+  local output_file output status detail
+  output_file=$(mktemp)
+  if output=$("$@" 2>"$output_file"); then
+    if [ -n "$output" ]; then
+      echo "ERROR: destructive-isolation collision: $label already exists ($output)" >&2
+      rm -f "$output_file"
+      return 1
+    fi
+  else
+    status=$?
+    detail=$(tr '\n' ' ' < "$output_file" | cut -c1-240)
+    echo "ERROR: could not verify $label absence (exit=$status): $detail" >&2
+    rm -f "$output_file"
+    return 2
+  fi
+  rm -f "$output_file"
+}
+
+# Fail closed unless every exact name this smoke run can destructively clean
+# is absent. Call before arming cleanup or creating any AWS resource.
+hf_assert_deploy_isolation() {
+  local stack_name="$1" project_name="$2"
+  local function_name="${project_name}-render"
+  local lambda_log="/aws/lambda/${function_name}"
+  local states_log="/aws/states/${function_name}"
+
+  hf_assert_command_absent "CloudFormation stack $stack_name" "does not exist" \
+    aws cloudformation describe-stacks --stack-name "$stack_name" &&
+    hf_assert_command_absent "Lambda function $function_name" \
+      "ResourceNotFoundException|Function not found" \
+      aws lambda get-function --function-name "$function_name" &&
+    hf_assert_named_list_absent "Step Functions state machine $function_name" \
+      aws stepfunctions list-state-machines \
+      --query "stateMachines[?name=='$function_name'].stateMachineArn" --output text &&
+    hf_assert_named_list_absent "log group $lambda_log" \
+      aws logs describe-log-groups --log-group-name-prefix "$lambda_log" \
+      --query "logGroups[?logGroupName=='$lambda_log'].logGroupName" --output text &&
+    hf_assert_named_list_absent "log group $states_log" \
+      aws logs describe-log-groups --log-group-name-prefix "$states_log" \
+      --query "logGroups[?logGroupName=='$states_log'].logGroupName" --output text
+}
+
+# Atomically reserve the exact stack name before SAM can create or update it.
+# CloudFormation's create-stack call is the compare-and-set: only one concurrent
+# smoke run can acquire a name that both preflight checks observed as absent.
+hf_reserve_smoke_stack() {
+  local stack_name="$1" run_id="$2"
+  aws cloudformation create-stack \
+    --stack-name "$stack_name" \
+    --template-body \
+      '{"Resources":{"SmokeOwnershipHandle":{"Type":"AWS::CloudFormation::WaitConditionHandle"}}}' \
+    --tags "Key=HyperframesSmokeRun,Value=$run_id" >/dev/null &&
+    aws cloudformation wait stack-create-complete --stack-name "$stack_name"
+}
+
+# Print "owned" when the stack has this run's ownership tag and
+# "absent" when there is no stack. Any foreign/missing tag or AWS API error
+# fails closed so a cleanup trap cannot delete a concurrent run's resources.
+hf_stack_ownership_status() {
+  local stack_name="$1" run_id="$2" output_file error_file owner status detail
+  output_file=$(mktemp)
+  error_file=$(mktemp)
+  if aws cloudformation describe-stacks \
+    --stack-name "$stack_name" \
+    --query "Stacks[0].Tags[?Key=='HyperframesSmokeRun'].Value | [0]" \
+    --output text >"$output_file" 2>"$error_file"; then
+    owner=$(tr -d '\r\n' <"$output_file")
+    rm -f "$output_file" "$error_file"
+    if [ "$owner" != "$run_id" ]; then
+      echo "ERROR: refusing cleanup: stack ownership is '${owner:-missing}', expected '$run_id'" >&2
+      return 3
+    fi
+    printf 'owned\n'
+    return
+  else
+    status=$?
+  fi
+  if hf_known_absent "does not exist" "$error_file"; then
+    rm -f "$output_file" "$error_file"
+    printf 'absent\n'
+    return
+  fi
+  detail=$(tr '\n' ' ' <"$error_file" | cut -c1-240)
+  echo "ERROR: could not verify stack ownership (exit=$status): $detail" >&2
+  rm -f "$output_file" "$error_file"
+  return 2
+}
+
+# Return a JSON object with any physical resources CloudFormation managed to
+# create, even when stack outputs were never populated. A genuinely absent
+# stack is an empty result; auth/network/query failures are errors.
+hf_discover_stack_resources() {
+  local stack_name="$1" output_file error_file status detail
+  output_file=$(mktemp)
+  error_file=$(mktemp)
+  if aws cloudformation list-stack-resources \
+    --stack-name "$stack_name" --output json >"$output_file" 2>"$error_file"; then
+    jq '{
+      renderBucket: (
+        [.StackResourceSummaries[]?
+          | select(.LogicalResourceId == "RenderBucket")
+          | .PhysicalResourceId][0] // ""
+      ),
+      stateMachineArn: (
+        [.StackResourceSummaries[]?
+          | select(.LogicalResourceId == "RenderStateMachine")
+          | .PhysicalResourceId][0] // ""
+      )
+    }' "$output_file"
+    rm -f "$output_file" "$error_file"
+    return
+  else
+    status=$?
+  fi
+  if hf_known_absent "does not exist" "$error_file"; then
+    printf '{"renderBucket":"","stateMachineArn":""}\n'
+    rm -f "$output_file" "$error_file"
+    return
+  fi
+  detail=$(tr '\n' ' ' < "$error_file" | cut -c1-240)
+  echo "ERROR: failed to discover physical stack resources (exit=$status): $detail" >&2
+  rm -f "$output_file" "$error_file"
+  return 2
+}
diff --git a/examples/aws-lambda/scripts/_s3-purge.sh b/examples/aws-lambda/scripts/_s3-purge.sh
new file mode 100755
index 000000000..8b794434a
--- /dev/null
+++ b/examples/aws-lambda/scripts/_s3-purge.sh
@@ -0,0 +1,77 @@
+#!/usr/bin/env bash
+# S3 bucket cleanup helpers. Sourcing this file has no side effects.
+
+# Delete every concrete object version and delete marker from a bucket.
+#
+# We intentionally re-list the first 1,000 entries after every delete batch
+# instead of advancing markers through a mutating result set. This handles
+# arbitrary pagination depth while avoiding skipped keys when the page being
+# used as a cursor has just been removed. It is also required for buckets with
+# versioning Suspended: `aws s3 rm` only creates null-version delete markers
+# and leaves the historical/null versions behind.
+hf_purge_s3_bucket_versions() {
+  local bucket="$1" work page delete_request delete_response count errors rounds=0
+  work=$(mktemp -d)
+  page="$work/page.json"
+  delete_request="$work/delete.json"
+  delete_response="$work/delete-response.json"
+
+  while true; do
+    rounds=$((rounds + 1))
+    if [ "$rounds" -gt 100000 ]; then
+      echo "ERROR: S3 purge exceeded 100000 batches for s3://$bucket" >&2
+      rm -rf "$work"
+      return 1
+    fi
+
+    if ! aws s3api list-object-versions \
+      --bucket "$bucket" \
+      --max-keys 1000 \
+      --no-paginate \
+      --output json > "$page"; then
+      echo "ERROR: failed to list object versions for s3://$bucket" >&2
+      rm -rf "$work"
+      return 1
+    fi
+
+    jq '{
+      Objects: [
+        (.Versions // [])[],
+        (.DeleteMarkers // [])[]
+      ] | map({Key, VersionId}),
+      Quiet: true
+    }' "$page" > "$delete_request"
+    count=$(jq '.Objects | length' "$delete_request")
+    if [ "$count" -eq 0 ]; then
+      break
+    fi
+
+    if ! aws s3api delete-objects \
+      --bucket "$bucket" \
+      --delete "file://$delete_request" \
+      --output json > "$delete_response"; then
+      echo "ERROR: failed to delete a version batch from s3://$bucket" >&2
+      rm -rf "$work"
+      return 1
+    fi
+    # Successful Quiet=true deletes may produce a zero-byte response body.
+    # Slurp mode treats that as an empty input set and therefore zero errors,
+    # while still counting per-object Errors when AWS returns a JSON object.
+    errors=$(jq -s '[.[] | (.Errors // [])[]] | length' "$delete_response")
+    if [ "$errors" -ne 0 ]; then
+      echo "ERROR: S3 returned per-object deletion errors for s3://$bucket:" >&2
+      jq -c '.Errors[]' "$delete_response" >&2
+      rm -rf "$work"
+      return 1
+    fi
+    echo "  purged $count object versions/delete markers from s3://$bucket"
+  done
+
+  rm -rf "$work"
+}
+
+hf_delete_s3_bucket_completely() {
+  local bucket="$1"
+  hf_purge_s3_bucket_versions "$bucket" &&
+    aws s3api delete-bucket --bucket "$bucket"
+}
diff --git a/examples/aws-lambda/scripts/_semantic-compare.sh b/examples/aws-lambda/scripts/_semantic-compare.sh
new file mode 100755
index 000000000..d90be6292
--- /dev/null
+++ b/examples/aws-lambda/scripts/_semantic-compare.sh
@@ -0,0 +1,239 @@
+#!/usr/bin/env bash
+# Canonical decoded-output comparison shared by the real-AWS smoke test and
+# its local unit test. This file defines functions only; sourcing it has no
+# side effects.
+
+hf_sha256() {
+  sha256sum "$1" | awk '{print $1}'
+}
+
+hf_canonical_video_framemd5() {
+  local input="$1" output="$2" raw
+  raw=$(mktemp)
+  if ! ffmpeg -nostdin -v error -y -i "$input" \
+      -map 0:v:0 -an -vf format=rgba -fps_mode passthrough \
+      -f framemd5 "$raw"; then
+    rm -f "$raw"
+    return 1
+  fi
+  # Ignore container timestamp/header differences here: normalized ffprobe
+  # metadata and duration are gated separately. This file pins decoded pixel
+  # bytes, frame order, frame count, and per-frame byte size.
+  awk -F',' '
+    !/^#/ && NF >= 6 {
+      size=$5; hash=$6
+      gsub(/[[:space:]]/, "", size)
+      gsub(/[[:space:]]/, "", hash)
+      print size "," hash
+    }
+  ' "$raw" > "$output"
+  rm -f "$raw"
+  [ -s "$output" ]
+}
+
+hf_normalized_ffprobe_metadata() {
+  local input="$1" output="$2"
+  ffprobe -v error \
+    -show_entries \
+stream=index,codec_type,codec_name,profile,pix_fmt,width,height,sample_aspect_ratio,display_aspect_ratio,r_frame_rate,avg_frame_rate,time_base,color_range,color_space,color_transfer,color_primaries,chroma_location,field_order,sample_fmt,sample_rate,channels,channel_layout \
+    -of json "$input" |
+    jq -S '{
+      streams: ((.streams // [])
+        | sort_by(.codec_type, .index)
+        | map(del(.index)))
+    }' > "$output"
+}
+
+hf_duration_seconds() {
+  ffprobe -v error -show_entries format=duration -of default=nw=1:nk=1 "$1"
+}
+
+hf_has_audio() {
+  [ -n "$(ffprobe -v error -select_streams a:0 -show_entries stream=index -of csv=p=0 "$1" 2>/dev/null | head -1)" ]
+}
+
+hf_decode_pcm() {
+  ffmpeg -nostdin -v error -i "$1" -map 0:a:0 -vn \
+    -ac 2 -ar 48000 -c:a pcm_s16le -f s16le "$2"
+}
+
+hf_extract_chunk_hashes() {
+  local history="$1" output="$2"
+  jq '[
+    .events[] |
+    .taskSucceededEventDetails.output? |
+    select(type == "string") |
+    (try fromjson catch empty) |
+    .Payload |
+    select(type == "object" and .Action == "renderChunk") |
+    {ChunkIndex, Sha256, FramesEncoded}
+  ] | sort_by(.ChunkIndex)' "$history" > "$output"
+}
+
+# Compare two rendered outputs. Writes durable evidence at <prefix>.* and a
+# machine-readable <prefix>.json. Returns 0 only for semantic equivalence.
+hf_compare_render_semantics() {
+  local v1="$1" v2="$2" prefix="$3"
+  local v1_history="${4:-}" v2_history="${5:-}"
+  local tolerance="${SEMANTIC_DURATION_TOLERANCE_SECONDS:-0.001}"
+  local work
+  work=$(mktemp -d)
+
+  local v1_frames="${prefix}.v1.framemd5"
+  local v2_frames="${prefix}.v2.framemd5"
+  local v1_meta="${prefix}.v1.ffprobe.json"
+  local v2_meta="${prefix}.v2.ffprobe.json"
+  local v1_duration v2_duration duration_delta
+  local v1_encoded_sha v2_encoded_sha encoded_equal
+  local video_equal metadata_equal duration_equal
+  local audio_state audio_equal v1_audio_sha="" v2_audio_sha=""
+  local v1_audio_bytes=0 v2_audio_bytes=0
+  local encoded_gated=false
+  local chunks_checked=false chunks_equal=true v1_chunk_count=0 v2_chunk_count=0
+  if [ "${REQUIRE_ENCODED_SHA_EQUAL:-false}" = true ]; then encoded_gated=true; fi
+
+  if ! hf_canonical_video_framemd5 "$v1" "$v1_frames" ||
+     ! hf_canonical_video_framemd5 "$v2" "$v2_frames" ||
+     ! hf_normalized_ffprobe_metadata "$v1" "$v1_meta" ||
+     ! hf_normalized_ffprobe_metadata "$v2" "$v2_meta"; then
+    rm -rf "$work"
+    return 2
+  fi
+
+  if cmp -s "$v1_frames" "$v2_frames"; then video_equal=true; else video_equal=false; fi
+  if cmp -s "$v1_meta" "$v2_meta"; then metadata_equal=true; else metadata_equal=false; fi
+
+  if ! v1_duration=$(hf_duration_seconds "$v1") ||
+     ! v2_duration=$(hf_duration_seconds "$v2"); then
+    rm -rf "$work"
+    return 2
+  fi
+  duration_delta=$(awk -v a="$v1_duration" -v b="$v2_duration" \
+    'BEGIN { d=a-b; if (d<0) d=-d; printf("%.9f", d) }')
+  if awk -v d="$duration_delta" -v t="$tolerance" 'BEGIN { exit !(d <= t) }'; then
+    duration_equal=true
+  else
+    duration_equal=false
+  fi
+
+  local v1_has_audio=false v2_has_audio=false
+  if hf_has_audio "$v1"; then v1_has_audio=true; fi
+  if hf_has_audio "$v2"; then v2_has_audio=true; fi
+  if [ "$v1_has_audio" = false ] && [ "$v2_has_audio" = false ]; then
+    audio_state="no-audio-on-either"
+    audio_equal=true
+  elif [ "$v1_has_audio" != "$v2_has_audio" ]; then
+    audio_state="audio-stream-mismatch"
+    audio_equal=false
+  else
+    audio_state="decoded-pcm"
+    if ! hf_decode_pcm "$v1" "$work/v1.pcm" ||
+       ! hf_decode_pcm "$v2" "$work/v2.pcm"; then
+      rm -rf "$work"
+      return 2
+    fi
+    v1_audio_sha=$(hf_sha256 "$work/v1.pcm")
+    v2_audio_sha=$(hf_sha256 "$work/v2.pcm")
+    v1_audio_bytes=$(wc -c < "$work/v1.pcm" | tr -d '[:space:]')
+    v2_audio_bytes=$(wc -c < "$work/v2.pcm" | tr -d '[:space:]')
+    if [ "$v1_audio_sha" = "$v2_audio_sha" ] && [ "$v1_audio_bytes" = "$v2_audio_bytes" ]; then
+      audio_equal=true
+    else
+      audio_equal=false
+    fi
+  fi
+
+  v1_encoded_sha=$(hf_sha256 "$v1")
+  v2_encoded_sha=$(hf_sha256 "$v2")
+  if [ "$v1_encoded_sha" = "$v2_encoded_sha" ]; then encoded_equal=true; else encoded_equal=false; fi
+
+  local semantic_equal=false
+  if [ "$video_equal" = true ] &&
+     [ "$metadata_equal" = true ] &&
+     [ "$duration_equal" = true ] &&
+     [ "$audio_equal" = true ]; then
+    semantic_equal=true
+  fi
+  if [ "$encoded_gated" = true ] && [ "$encoded_equal" != true ]; then
+    semantic_equal=false
+  fi
+
+  if [ -n "$v1_history" ] || [ -n "$v2_history" ]; then
+    chunks_checked=true
+    if [ -z "$v1_history" ] || [ -z "$v2_history" ] ||
+       ! hf_extract_chunk_hashes "$v1_history" "${prefix}.v1.chunk-hashes.json" ||
+       ! hf_extract_chunk_hashes "$v2_history" "${prefix}.v2.chunk-hashes.json"; then
+      rm -rf "$work"
+      return 2
+    fi
+    v1_chunk_count=$(jq 'length' "${prefix}.v1.chunk-hashes.json")
+    v2_chunk_count=$(jq 'length' "${prefix}.v2.chunk-hashes.json")
+    if [ "$v1_chunk_count" -eq 0 ] ||
+       [ "$v2_chunk_count" -eq 0 ] ||
+       ! cmp -s "${prefix}.v1.chunk-hashes.json" "${prefix}.v2.chunk-hashes.json"; then
+      chunks_equal=false
+      semantic_equal=false
+    fi
+  fi
+
+  jq -n \
+    --arg v1 "$v1" --arg v2 "$v2" \
+    --argjson semanticEqual "$semantic_equal" \
+    --argjson videoEqual "$video_equal" \
+    --argjson v1VideoFrameCount "$(wc -l < "$v1_frames" | tr -d '[:space:]')" \
+    --argjson v2VideoFrameCount "$(wc -l < "$v2_frames" | tr -d '[:space:]')" \
+    --argjson metadataEqual "$metadata_equal" \
+    --arg v1Duration "$v1_duration" --arg v2Duration "$v2_duration" \
+    --arg durationDelta "$duration_delta" --arg durationTolerance "$tolerance" \
+    --arg audioState "$audio_state" --argjson audioEqual "$audio_equal" \
+    --arg v1AudioSha256 "$v1_audio_sha" --arg v2AudioSha256 "$v2_audio_sha" \
+    --argjson v1AudioBytes "$v1_audio_bytes" --argjson v2AudioBytes "$v2_audio_bytes" \
+    --arg v1EncodedSha256 "$v1_encoded_sha" --arg v2EncodedSha256 "$v2_encoded_sha" \
+    --argjson encodedShaEqual "$encoded_equal" \
+    --argjson encodedShaGated "$encoded_gated" \
+    --argjson chunksChecked "$chunks_checked" \
+    --argjson chunksEqual "$chunks_equal" \
+    --argjson v1ChunkCount "$v1_chunk_count" \
+    --argjson v2ChunkCount "$v2_chunk_count" \
+    '{
+      v1: $v1,
+      v2: $v2,
+      semanticEqual: $semanticEqual,
+      video: {
+        equal: $videoEqual,
+        v1FrameCount: $v1VideoFrameCount,
+        v2FrameCount: $v2VideoFrameCount
+      },
+      metadata: {equal: $metadataEqual},
+      chunks: {
+        checked: $chunksChecked,
+        equal: $chunksEqual,
+        v1Count: $v1ChunkCount,
+        v2Count: $v2ChunkCount
+      },
+      duration: {
+        v1Seconds: ($v1Duration | tonumber),
+        v2Seconds: ($v2Duration | tonumber),
+        deltaSeconds: ($durationDelta | tonumber),
+        toleranceSeconds: ($durationTolerance | tonumber),
+        equal: (($durationDelta | tonumber) <= ($durationTolerance | tonumber))
+      },
+      audio: {
+        state: $audioState,
+        equal: $audioEqual,
+        v1Sha256: $v1AudioSha256,
+        v2Sha256: $v2AudioSha256,
+        v1Bytes: $v1AudioBytes,
+        v2Bytes: $v2AudioBytes
+      },
+      encoded: {
+        equal: $encodedShaEqual,
+        gated: $encodedShaGated,
+        v1Sha256: $v1EncodedSha256,
+        v2Sha256: $v2EncodedSha256
+      }
+    }' > "${prefix}.json"
+
+  rm -rf "$work"
+  [ "$semantic_equal" = true ]
+}
diff --git a/examples/aws-lambda/scripts/_smoke-config.sh b/examples/aws-lambda/scripts/_smoke-config.sh
new file mode 100755
index 000000000..54f3e500a
--- /dev/null
+++ b/examples/aws-lambda/scripts/_smoke-config.sh
@@ -0,0 +1,11 @@
+#!/usr/bin/env bash
+# Small configuration helpers shared by smoke.sh and shell tests.
+
+hf_resolve_psnr_threshold() {
+  local explicit="$1" fixture_meta="$2"
+  if [ -n "$explicit" ]; then
+    printf '%s\n' "$explicit"
+    return
+  fi
+  jq -er '(.minPsnr // 40) | numbers' "$fixture_meta"
+}
diff --git a/examples/aws-lambda/scripts/aws-isolation.test.sh b/examples/aws-lambda/scripts/aws-isolation.test.sh
new file mode 100755
index 000000000..5f132b7f3
--- /dev/null
+++ b/examples/aws-lambda/scripts/aws-isolation.test.sh
@@ -0,0 +1,127 @@
+#!/usr/bin/env bash
+set -euo pipefail
+
+SCRIPT_DIR="$(cd "$(dirname "${BASH_SOURCE[0]}")" && pwd)"
+# shellcheck source=./_aws-isolation.sh
+source "$SCRIPT_DIR/_aws-isolation.sh"
+
+WORK=$(mktemp -d)
+trap 'rm -rf "$WORK"' EXIT
+mkdir -p "$WORK/bin"
+
+cat > "$WORK/bin/aws" <<'MOCK_AWS'
+#!/usr/bin/env bash
+set -euo pipefail
+operation="${1:-} ${2:-}"
+
+case "$MOCK_MODE:$operation" in
+  absent:"cloudformation describe-stacks")
+    echo "ValidationError: Stack with id smoke does not exist" >&2
+    exit 255
+    ;;
+  absent:"lambda get-function")
+    echo "ResourceNotFoundException: Function not found" >&2
+    exit 254
+    ;;
+  absent:"stepfunctions list-state-machines"|absent:"logs describe-log-groups")
+    exit 0
+    ;;
+  collision:"cloudformation describe-stacks")
+    echo "ValidationError: Stack with id smoke does not exist" >&2
+    exit 255
+    ;;
+  collision:"lambda get-function")
+    printf '{"Configuration":{"FunctionName":"collision"}}\n'
+    ;;
+  auth:"cloudformation describe-stacks")
+    echo "AccessDenied: credentials expired" >&2
+    exit 253
+    ;;
+  owned:"cloudformation describe-stacks")
+    printf 'run-a\n'
+    ;;
+  foreign:"cloudformation describe-stacks")
+    printf 'run-b\n'
+    ;;
+  ownership-missing:"cloudformation describe-stacks")
+    echo "ValidationError: Stack with id smoke does not exist" >&2
+    exit 255
+    ;;
+  reserve:"cloudformation create-stack"|reserve:"cloudformation wait")
+    exit 0
+    ;;
+  discovery:"cloudformation list-stack-resources")
+    cat <<'JSON'
+{"StackResourceSummaries":[
+  {"LogicalResourceId":"RenderBucket","PhysicalResourceId":"physical-render-bucket"},
+  {"LogicalResourceId":"RenderStateMachine","PhysicalResourceId":"arn:aws:states:us-east-2:1:stateMachine:physical"}
+]}
+JSON
+    ;;
+  missing:"cloudformation list-stack-resources")
+    echo "ValidationError: Stack with id smoke does not exist" >&2
+    exit 255
+    ;;
+  *)
+    echo "unexpected mock request: $MOCK_MODE $operation" >&2
+    exit 2
+    ;;
+esac
+MOCK_AWS
+chmod 755 "$WORK/bin/aws"
+
+name_a=$(hf_derive_project_name "hyperframes-lambda-smoke-a-very-long-shared-prefix-111")
+name_b=$(hf_derive_project_name "hyperframes-lambda-smoke-a-very-long-shared-prefix-222")
+[ "$name_a" != "$name_b" ]
+[ "${#name_a}" -le 49 ]
+[ "${#name_b}" -le 49 ]
+run_a=$(hf_new_smoke_run_id)
+run_b=$(hf_new_smoke_run_id)
+[ "$run_a" != "$run_b" ]
+bucket_a=$(hf_sam_deploy_bucket_name "767398024897" "us-east-2" "$run_a")
+bucket_b=$(hf_sam_deploy_bucket_name "767398024897" "us-east-2" "$run_b")
+[ "$bucket_a" != "$bucket_b" ]
+[ "${#bucket_a}" -le 63 ]
+[ "${#bucket_b}" -le 63 ]
+
+MOCK_MODE=absent PATH="$WORK/bin:$PATH" \
+  hf_assert_deploy_isolation "smoke" "$name_a"
+if MOCK_MODE=collision PATH="$WORK/bin:$PATH" \
+  hf_assert_deploy_isolation "smoke" "$name_a" 2>"$WORK/collision-error"; then
+  echo "expected exact-name collision to fail closed" >&2
+  exit 1
+fi
+grep -q "collision" "$WORK/collision-error"
+
+if MOCK_MODE=auth PATH="$WORK/bin:$PATH" \
+  hf_assert_deploy_isolation "smoke" "$name_a" 2>"$WORK/auth-error"; then
+  echo "expected verification API error to fail closed" >&2
+  exit 1
+fi
+grep -q "could not prove" "$WORK/auth-error"
+
+[ "$(MOCK_MODE=owned PATH="$WORK/bin:$PATH" \
+  hf_stack_ownership_status "smoke" "run-a")" = "owned" ]
+[ "$(MOCK_MODE=ownership-missing PATH="$WORK/bin:$PATH" \
+  hf_stack_ownership_status "smoke" "run-a")" = "absent" ]
+if MOCK_MODE=foreign PATH="$WORK/bin:$PATH" \
+  hf_stack_ownership_status "smoke" "run-a" 2>"$WORK/foreign-error"; then
+  echo "expected foreign stack ownership to fail closed" >&2
+  exit 1
+fi
+grep -q "refusing cleanup" "$WORK/foreign-error"
+MOCK_MODE=reserve PATH="$WORK/bin:$PATH" \
+  hf_reserve_smoke_stack "smoke" "run-a"
+
+discovered=$(MOCK_MODE=discovery PATH="$WORK/bin:$PATH" \
+  hf_discover_stack_resources "smoke")
+[ "$(jq -r .renderBucket <<<"$discovered")" = "physical-render-bucket" ]
+[ "$(jq -r .stateMachineArn <<<"$discovered")" = \
+  "arn:aws:states:us-east-2:1:stateMachine:physical" ]
+
+missing=$(MOCK_MODE=missing PATH="$WORK/bin:$PATH" \
+  hf_discover_stack_resources "smoke")
+[ "$(jq -r .renderBucket <<<"$missing")" = "" ]
+[ "$(jq -r .stateMachineArn <<<"$missing")" = "" ]
+
+echo "aws isolation shell test passed"
diff --git a/examples/aws-lambda/scripts/s3-purge.test.sh b/examples/aws-lambda/scripts/s3-purge.test.sh
new file mode 100755
index 000000000..bfaf00bbd
--- /dev/null
+++ b/examples/aws-lambda/scripts/s3-purge.test.sh
@@ -0,0 +1,83 @@
+#!/usr/bin/env bash
+set -euo pipefail
+
+SCRIPT_DIR="$(cd "$(dirname "${BASH_SOURCE[0]}")" && pwd)"
+# shellcheck source=./_s3-purge.sh
+source "$SCRIPT_DIR/_s3-purge.sh"
+
+WORK=$(mktemp -d)
+trap 'rm -rf "$WORK"' EXIT
+mkdir -p "$WORK/bin"
+printf '1001\n' > "$WORK/remaining"
+: > "$WORK/delete-batches"
+
+cat > "$WORK/bin/aws" <<'MOCK_AWS'
+#!/usr/bin/env bash
+set -euo pipefail
+
+operation="${1:-} ${2:-}"
+shift 2
+bucket=""
+delete_file=""
+while [ $# -gt 0 ]; do
+  case "$1" in
+    --bucket) bucket="$2"; shift 2 ;;
+    --delete) delete_file="${2#file://}"; shift 2 ;;
+    *) shift ;;
+  esac
+done
+[ "$bucket" = "mock-bucket" ]
+
+case "$operation" in
+  "s3api list-object-versions")
+    remaining=$(cat "$MOCK_WORK/remaining")
+    if [ "$remaining" -gt 1000 ]; then
+      jq -n '{
+        IsTruncated: true,
+        Versions: [range(0;999) | {Key:("version-" + tostring),VersionId:("v-" + tostring)}],
+        DeleteMarkers: [{Key:"deleted-null-object",VersionId:"null"}]
+      }'
+    elif [ "$remaining" -gt 0 ]; then
+      jq -n --argjson remaining "$remaining" '{
+        IsTruncated: false,
+        Versions: [range(0;$remaining) | {Key:("tail-" + tostring),VersionId:"null"}],
+        DeleteMarkers: []
+      }'
+    else
+      jq -n '{IsTruncated:false,Versions:[],DeleteMarkers:[]}'
+    fi
+    ;;
+  "s3api delete-objects")
+    count=$(jq '.Objects | length' "$delete_file")
+    jq -e '
+      if (.Objects | length) == 1000
+      then any(.Objects[]; .Key == "deleted-null-object" and .VersionId == "null")
+      else true
+      end
+    ' "$delete_file" >/dev/null
+    remaining=$(cat "$MOCK_WORK/remaining")
+    printf '%s\n' "$((remaining - count))" > "$MOCK_WORK/remaining"
+    printf '%s\n' "$count" >> "$MOCK_WORK/delete-batches"
+    # Real AWS returns a blank body for a successful Quiet=true delete.
+    :
+    ;;
+  "s3api delete-bucket")
+    [ "$(cat "$MOCK_WORK/remaining")" -eq 0 ]
+    touch "$MOCK_WORK/bucket-deleted"
+    ;;
+  *)
+    echo "unexpected mock operation: $operation" >&2
+    exit 2
+    ;;
+esac
+MOCK_AWS
+chmod 755 "$WORK/bin/aws"
+
+MOCK_WORK="$WORK" PATH="$WORK/bin:$PATH" \
+  hf_delete_s3_bucket_completely "mock-bucket" 2>"$WORK/stderr"
+
+[ "$(cat "$WORK/remaining")" -eq 0 ]
+[ "$(paste -sd, "$WORK/delete-batches")" = "1000,1" ]
+[ -f "$WORK/bucket-deleted" ]
+[ ! -s "$WORK/stderr" ]
+echo "s3 purge shell test passed"
diff --git a/examples/aws-lambda/scripts/semantic-compare.test.sh b/examples/aws-lambda/scripts/semantic-compare.test.sh
new file mode 100755
index 000000000..99de4c5f5
--- /dev/null
+++ b/examples/aws-lambda/scripts/semantic-compare.test.sh
@@ -0,0 +1,121 @@
+#!/usr/bin/env bash
+set -euo pipefail
+
+SCRIPT_DIR="$(cd "$(dirname "${BASH_SOURCE[0]}")" && pwd)"
+# shellcheck source=./_semantic-compare.sh
+source "$SCRIPT_DIR/_semantic-compare.sh"
+# shellcheck source=./_smoke-config.sh
+source "$SCRIPT_DIR/_smoke-config.sh"
+
+for cmd in ffmpeg ffprobe jq sha256sum cmp; do
+  command -v "$cmd" >/dev/null 2>&1 || {
+    echo "missing test dependency: $cmd" >&2
+    exit 1
+  }
+done
+
+WORK=$(mktemp -d)
+trap 'rm -rf "$WORK"' EXIT
+
+printf '{"minPsnr":25}\n' > "$WORK/meta.json"
+[ "$(hf_resolve_psnr_threshold "" "$WORK/meta.json")" = "25" ]
+[ "$(hf_resolve_psnr_threshold "37.5" "$WORK/meta.json")" = "37.5" ]
+
+ffmpeg -nostdin -v error -y \
+  -f lavfi -i "color=c=red:s=64x64:r=24:d=0.5" \
+  -f lavfi -i "sine=frequency=440:sample_rate=48000:duration=0.5" \
+  -shortest -c:v mpeg4 -q:v 3 -c:a aac "$WORK/original.mp4"
+
+# Rewrapping changes encoded bytes while preserving decoded semantics.
+ffmpeg -nostdin -v error -y -i "$WORK/original.mp4" \
+  -map 0 -c copy -metadata comment="different container bytes" "$WORK/rewrapped.mp4"
+hf_compare_render_semantics "$WORK/original.mp4" "$WORK/rewrapped.mp4" "$WORK/equal"
+jq -e '
+  .semanticEqual == true and
+  .video.equal == true and
+  .audio.equal == true and
+  .metadata.equal == true and
+  .duration.equal == true and
+  .encoded.equal == false
+' "$WORK/equal.json" >/dev/null
+
+cat > "$WORK/v1-history.json" <<'JSON'
+{"events":[
+  {"taskSucceededEventDetails":{"output":"{\"Payload\":{\"Action\":\"renderChunk\",\"ChunkIndex\":1,\"Sha256\":\"bbb\",\"FramesEncoded\":12}}"}},
+  {"taskSucceededEventDetails":{"output":"{\"Payload\":{\"Action\":\"plan\",\"ChunkCount\":2}}"}},
+  {"taskSucceededEventDetails":{"output":"{\"Payload\":{\"Action\":\"renderChunk\",\"ChunkIndex\":0,\"Sha256\":\"aaa\",\"FramesEncoded\":12}}"}}
+]}
+JSON
+cat > "$WORK/v2-history.json" <<'JSON'
+{"events":[
+  {"taskSucceededEventDetails":{"output":"{\"Payload\":{\"Action\":\"renderChunk\",\"ChunkIndex\":0,\"Sha256\":\"aaa\",\"FramesEncoded\":12}}"}},
+  {"taskSucceededEventDetails":{"output":"{\"Payload\":{\"Action\":\"renderChunk\",\"ChunkIndex\":1,\"Sha256\":\"bbb\",\"FramesEncoded\":12}}"}}
+]}
+JSON
+hf_compare_render_semantics \
+  "$WORK/original.mp4" "$WORK/rewrapped.mp4" "$WORK/chunks-equal" \
+  "$WORK/v1-history.json" "$WORK/v2-history.json"
+jq -e '.semanticEqual == true and .chunks == {checked:true,equal:true,v1Count:2,v2Count:2}' \
+  "$WORK/chunks-equal.json" >/dev/null
+
+jq '(.events[0].taskSucceededEventDetails.output) =
+  "{\"Payload\":{\"Action\":\"renderChunk\",\"ChunkIndex\":0,\"Sha256\":\"different\",\"FramesEncoded\":12}}"' \
+  "$WORK/v2-history.json" > "$WORK/v2-history-mismatch.json"
+if hf_compare_render_semantics \
+  "$WORK/original.mp4" "$WORK/rewrapped.mp4" "$WORK/chunks-mismatch" \
+  "$WORK/v1-history.json" "$WORK/v2-history-mismatch.json"; then
+  echo "expected chunk-hash mismatch" >&2
+  exit 1
+fi
+jq -e '.semanticEqual == false and .chunks.equal == false' \
+  "$WORK/chunks-mismatch.json" >/dev/null
+
+if REQUIRE_ENCODED_SHA_EQUAL=true \
+  hf_compare_render_semantics "$WORK/original.mp4" "$WORK/rewrapped.mp4" "$WORK/encoded-gated"; then
+  echo "expected encoded-SHA gate to reject rewrapped output" >&2
+  exit 1
+fi
+
+ffmpeg -nostdin -v error -y \
+  -f lavfi -i "color=c=blue:s=64x64:r=24:d=0.5" \
+  -f lavfi -i "sine=frequency=440:sample_rate=48000:duration=0.5" \
+  -shortest -c:v mpeg4 -q:v 3 -c:a aac "$WORK/video-mismatch.mp4"
+if hf_compare_render_semantics \
+  "$WORK/original.mp4" "$WORK/video-mismatch.mp4" "$WORK/video-mismatch"; then
+  echo "expected decoded-video mismatch" >&2
+  exit 1
+fi
+jq -e '.semanticEqual == false and .video.equal == false' \
+  "$WORK/video-mismatch.json" >/dev/null
+
+ffmpeg -nostdin -v error -y \
+  -f lavfi -i "color=c=red:s=64x64:r=24:d=0.5" \
+  -f lavfi -i "sine=frequency=880:sample_rate=48000:duration=0.5" \
+  -shortest -c:v mpeg4 -q:v 3 -c:a aac "$WORK/audio-mismatch.mp4"
+if hf_compare_render_semantics \
+  "$WORK/original.mp4" "$WORK/audio-mismatch.mp4" "$WORK/audio-mismatch"; then
+  echo "expected decoded-audio mismatch" >&2
+  exit 1
+fi
+jq -e '.semanticEqual == false and .video.equal == true and .audio.equal == false' \
+  "$WORK/audio-mismatch.json" >/dev/null
+
+ffmpeg -nostdin -v error -y \
+  -f lavfi -i "color=c=red:s=64x64:r=24:d=0.5" \
+  -an -c:v mpeg4 -q:v 3 "$WORK/silent.mp4"
+ffmpeg -nostdin -v error -y -i "$WORK/silent.mp4" \
+  -map 0 -c copy -metadata comment="silent rewrap" "$WORK/silent-rewrapped.mp4"
+hf_compare_render_semantics \
+  "$WORK/silent.mp4" "$WORK/silent-rewrapped.mp4" "$WORK/silent-equal"
+jq -e '.semanticEqual == true and .audio.state == "no-audio-on-either"' \
+  "$WORK/silent-equal.json" >/dev/null
+
+if hf_compare_render_semantics \
+  "$WORK/original.mp4" "$WORK/silent.mp4" "$WORK/audio-stream-mismatch"; then
+  echo "expected audio-stream presence mismatch" >&2
+  exit 1
+fi
+jq -e '.semanticEqual == false and .audio.state == "audio-stream-mismatch"' \
+  "$WORK/audio-stream-mismatch.json" >/dev/null
+
+echo "semantic compare shell tests passed"
diff --git a/examples/aws-lambda/scripts/smoke.sh b/examples/aws-lambda/scripts/smoke.sh
index 2d0d0cf3a..d90d46f71 100755
--- a/examples/aws-lambda/scripts/smoke.sh
+++ b/examples/aws-lambda/scripts/smoke.sh
@@ -18,17 +18,20 @@
 #   - sam (AWS SAM CLI, >= 1.100)
 #   - bun (>= 1.3, to build the handler ZIP)
 #   - ffmpeg (system or built-in; PSNR computation)
+#   - ffprobe (normalized stream metadata + duration)
 #   - jq
+#   - sha256sum + cmp
 #   - zip
 #
 # Inputs (flags or env vars):
 #   --fixture <name>           (default: mp4-h264-sdr)
 #   --chunk-counts <list>      (default: 2,4,8)
-#   --psnr-threshold <db>      (default: 40)
-#   --stack-name <name>        (default: hyperframes-lambda-smoke-<timestamp>)
+#   --psnr-threshold <db>      (default: fixture meta.json minPsnr)
+#   --stack-name <name>        (default: hyperframes-lambda-smoke-<unique-run-id>)
 #   --region <region>          (default: $AWS_REGION or us-east-1)
 #   --profile <name>           (default: $AWS_PROFILE, otherwise the AWS
 #                               default profile resolution chain)
+#   --plan-protocol <v1|v2|both> (default: v1)
 #   --keep-stack               (skip `sam delete` at the end)
 #   --skip-build               (skip the ZIP rebuild; use the existing one)
 #
@@ -51,6 +54,14 @@ set -euo pipefail
 SCRIPT_DIR="$(cd "$(dirname "${BASH_SOURCE[0]}")" && pwd)"
 REPO_ROOT="$(cd "$SCRIPT_DIR/../../.." && pwd)"
 SAM_DIR="$SCRIPT_DIR/.."
+# shellcheck source=./_semantic-compare.sh
+source "$SCRIPT_DIR/_semantic-compare.sh"
+# shellcheck source=./_s3-purge.sh
+source "$SCRIPT_DIR/_s3-purge.sh"
+# shellcheck source=./_smoke-config.sh
+source "$SCRIPT_DIR/_smoke-config.sh"
+# shellcheck source=./_aws-isolation.sh
+source "$SCRIPT_DIR/_aws-isolation.sh"
 
 # ── Defaults ──────────────────────────────────────────────────────────────
 FIXTURE="${FIXTURE:-mp4-h264-sdr}"
@@ -63,19 +74,25 @@ CHUNK_COUNTS="${CHUNK_COUNTS:-2,4,8}"
 # than the in-process baseline (Debian-bookworm-slim's apt ffmpeg +
 # Puppeteer-managed chrome-headless-shell). Expected drift across those
 # environments is ~3 dB on simple fixtures, more on font-heavy ones.
-# The gate defaults to 40 dB to absorb that drift; tighten it via
-# --psnr-threshold for a stricter check.
-PSNR_THRESHOLD="${PSNR_THRESHOLD:-40}"
-STACK_NAME="${STACK_NAME:-hyperframes-lambda-smoke-$(date +%s)}"
+# The gate defaults to the fixture's own `meta.json.minPsnr`, which is
+# calibrated for that content/runtime boundary. Override it via
+# --psnr-threshold (or PSNR_THRESHOLD) for a stricter experiment.
+PSNR_THRESHOLD="${PSNR_THRESHOLD-}"
+SMOKE_RUN_ID="${HYPERFRAMES_SMOKE_RUN_ID:-$(hf_new_smoke_run_id)}"
+STACK_NAME="${STACK_NAME:-hyperframes-lambda-smoke-${SMOKE_RUN_ID}}"
 AWS_REGION="${AWS_REGION:-us-east-1}"
 AWS_PROFILE="${AWS_PROFILE:-}"
+PLAN_PROTOCOL="${PLAN_PROTOCOL:-v1}"
 KEEP_STACK="false"
 SKIP_BUILD="false"
+REQUIRE_ENCODED_SHA_EQUAL="${REQUIRE_ENCODED_SHA_EQUAL:-false}"
 # Lambda Map-state concurrency cap. 16 fans out the chunks aggressively
 # at the cost of a higher peak Lambda bill. Drop to 2-4 for cheaper runs;
 # raise as far as your AWS account's regional concurrency quota allows.
 RESERVED_CONCURRENCY="${RESERVED_CONCURRENCY:-16}"
 ARTIFACT_DIR="$REPO_ROOT/lambda-smoke-artifacts"
+PROJECT_NAME=""
+SAM_DEPLOY_BUCKET=""
 
 usage() {
   cat <<'EOF'
@@ -89,12 +106,14 @@ output against the in-process baseline, and tears the stack down.
 Flags:
   --fixture <name>              fixture under packages/producer/tests/distributed/ (default: mp4-h264-sdr)
   --chunk-counts <list>         comma-separated chunk counts to benchmark (default: 2,4,8)
-  --psnr-threshold <db>         PSNR floor in dB for visual equivalence (default: 40)
-  --stack-name <name>           SAM stack name (default: hyperframes-lambda-smoke-<timestamp>)
+  --psnr-threshold <db>         PSNR floor (default: fixture meta.json minPsnr)
+  --stack-name <name>           SAM stack name (default: hyperframes-lambda-smoke-<unique-run-id>)
   --region <region>             AWS region (default: $AWS_REGION or us-east-1)
   --profile <name>              AWS profile (default: $AWS_PROFILE)
+  --plan-protocol <v1|v2|both>  plan transport(s) to compare (default: v1)
   --reserved-concurrency <N>    Lambda Map MaxConcurrency cap (default: 16)
   --keep-stack                  skip `sam delete` at the end (manual teardown later)
+  --require-encoded-sha-equal   also gate byte-identical encoded MP4 output
   --skip-build                  reuse existing dist/handler.zip
   -h, --help                    show this help and exit
 
@@ -105,7 +124,8 @@ Cost notes:
   per run before S3 PUT/GET. Set --reserved-concurrency lower for
   cost-conscious accounts.
 
-Required tools on PATH: aws (v2), sam (>= 1.100), bun (>= 1.3), ffmpeg, jq, zip.
+Required tools on PATH: aws (v2), sam (>= 1.100), bun (>= 1.3),
+ffmpeg, ffprobe, jq, sha256sum, cmp, zip.
 EOF
 }
 
@@ -118,7 +138,9 @@ while [ $# -gt 0 ]; do
     --stack-name)     STACK_NAME="$2"; shift 2 ;;
     --region)         AWS_REGION="$2"; shift 2 ;;
     --profile)        AWS_PROFILE="$2"; shift 2 ;;
+    --plan-protocol)  PLAN_PROTOCOL="$2"; shift 2 ;;
     --keep-stack)     KEEP_STACK="true"; shift ;;
+    --require-encoded-sha-equal) REQUIRE_ENCODED_SHA_EQUAL="true"; shift ;;
     --skip-build)     SKIP_BUILD="true"; shift ;;
     --reserved-concurrency) RESERVED_CONCURRENCY="$2"; shift 2 ;;
     -h|--help)        usage; exit 0 ;;
@@ -126,6 +148,12 @@ while [ $# -gt 0 ]; do
   esac
 done
 
+if [ "$PLAN_PROTOCOL" != "v1" ] && [ "$PLAN_PROTOCOL" != "v2" ] && [ "$PLAN_PROTOCOL" != "both" ]; then
+  echo "ERROR: --plan-protocol must be v1, v2, or both." >&2
+  exit 1
+fi
+PROJECT_NAME=$(hf_derive_project_name "$STACK_NAME")
+
 # Export AWS_REGION + AWS_PROFILE so `aws` and `sam` inherit them via the
 # standard env-var chain. AWS_PROFILE may be empty — that lets the CLI's
 # default resolution (env → ~/.aws/config → IMDS) take over without us
@@ -143,6 +171,62 @@ fi
 
 # ── Cleanup helper (defined early so the failure paths below can call it) ─
 BUCKET=""
+STATE_MACHINE_ARN=""
+
+verify_absent_api() {
+  local label="$1" absent_pattern="$2"
+  shift 2
+  local output_file status
+  output_file=$(mktemp)
+  if "$@" >"$output_file" 2>&1; then
+    leaks+=("$label")
+    rm -f "$output_file"
+    return
+  else
+    status=$?
+  fi
+  if ! grep -Eiq "$absent_pattern" "$output_file"; then
+    local detail
+    detail=$(tr '\n' ' ' < "$output_file" | cut -c1-240)
+    leaks+=("verification-error:$label:exit=$status:$detail")
+  fi
+  rm -f "$output_file"
+}
+
+verify_log_group_absent() {
+  local log_group="$1" output_file output status detail
+  output_file=$(mktemp)
+  if output=$(aws logs describe-log-groups \
+    --log-group-name-prefix "$log_group" \
+    --query "logGroups[?logGroupName=='$log_group'].logGroupName" \
+    --output text 2>"$output_file"); then
+    if [ -n "$output" ]; then
+      leaks+=("log-group:$log_group")
+    fi
+  else
+    status=$?
+    detail=$(tr '\n' ' ' < "$output_file" | cut -c1-240)
+    leaks+=("verification-error:log-group:$log_group:exit=$status:$detail")
+  fi
+  rm -f "$output_file"
+}
+
+verify_state_machine_name_absent() {
+  local state_machine_name="$1" output_file output status detail
+  output_file=$(mktemp)
+  if output=$(aws stepfunctions list-state-machines \
+    --query "stateMachines[?name=='$state_machine_name'].stateMachineArn" \
+    --output text 2>"$output_file"); then
+    if [ -n "$output" ]; then
+      leaks+=("state-machine-name:$state_machine_name:$output")
+    fi
+  else
+    status=$?
+    detail=$(tr '\n' ' ' < "$output_file" | cut -c1-240)
+    leaks+=("verification-error:state-machine-name:$state_machine_name:exit=$status:$detail")
+  fi
+  rm -f "$output_file"
+}
 
 cleanup_and_exit() {
   local exit_code="${1:-0}"
@@ -157,24 +241,135 @@ cleanup_and_exit() {
     fi
   else
     echo "→ Tearing down stack $STACK_NAME"
-    if [ -n "$BUCKET" ]; then
-      aws s3 rm "s3://$BUCKET" --recursive >/dev/null 2>&1 || true
-      aws s3 rb "s3://$BUCKET" --force >/dev/null 2>&1 || true
+    local cleanup_identity_ok=true
+    local stack_cleanup_allowed=false
+    local ownership_status=""
+    local discovery_errors=()
+    if ! aws sts get-caller-identity >/dev/null; then
+      cleanup_identity_ok=false
+      echo "ERROR: AWS identity check failed before cleanup; absence cannot be trusted" >&2
     fi
-    (cd "$SAM_DIR" && sam delete \
-      --stack-name "$STACK_NAME" \
-      --no-prompts) >/dev/null 2>&1 || true
+    if [ "$cleanup_identity_ok" = true ]; then
+      if ownership_status=$(hf_stack_ownership_status "$STACK_NAME" "$SMOKE_RUN_ID"); then
+        if [ "$ownership_status" = "owned" ]; then
+          stack_cleanup_allowed=true
+        else
+          echo "→ Stack is absent; skipping stack-scoped destructive cleanup"
+        fi
+      else
+        discovery_errors+=("verification-error:cloudformation-stack-ownership")
+      fi
+    fi
+    if [ "$stack_cleanup_allowed" = true ]; then
+      local discovered
+      if discovered=$(hf_discover_stack_resources "$STACK_NAME"); then
+        if [ -z "$BUCKET" ]; then
+          BUCKET=$(jq -r '.renderBucket' <<<"$discovered")
+        fi
+        if [ -z "$STATE_MACHINE_ARN" ]; then
+          STATE_MACHINE_ARN=$(jq -r '.stateMachineArn' <<<"$discovered")
+        fi
+      else
+        discovery_errors+=("verification-error:cloudformation-resource-discovery")
+      fi
+      if [ -n "$BUCKET" ]; then
+        if ! hf_delete_s3_bucket_completely "$BUCKET"; then
+          echo "WARN: failed to purge/delete retained render bucket s3://$BUCKET" >&2
+        fi
+      fi
+      if ! (cd "$SAM_DIR" && sam delete \
+        --stack-name "$STACK_NAME" \
+        --region "$AWS_REGION" \
+        --no-prompts); then
+        echo "WARN: sam delete failed for $STACK_NAME" >&2
+      fi
+      if ! aws cloudformation wait stack-delete-complete --stack-name "$STACK_NAME"; then
+        echo "WARN: CloudFormation did not confirm stack deletion for $STACK_NAME" >&2
+      fi
+      if aws logs describe-log-groups \
+        --log-group-name-prefix "/aws/lambda/${PROJECT_NAME}-render" \
+        --query "logGroups[?logGroupName=='/aws/lambda/${PROJECT_NAME}-render'].logGroupName" \
+        --output text | grep -q .; then
+        if ! aws logs delete-log-group --log-group-name "/aws/lambda/${PROJECT_NAME}-render"; then
+          echo "WARN: failed to delete Lambda log group" >&2
+        fi
+      fi
+    fi
+    if [ -n "$SAM_DEPLOY_BUCKET" ]; then
+      if ! hf_delete_s3_bucket_completely "$SAM_DEPLOY_BUCKET"; then
+        echo "WARN: failed to purge/delete SAM deployment bucket s3://$SAM_DEPLOY_BUCKET" >&2
+      fi
+    fi
+
+    local leaks=()
+    if [ "${#discovery_errors[@]}" -gt 0 ]; then
+      leaks+=("${discovery_errors[@]}")
+    fi
+    if [ "$cleanup_identity_ok" != true ]; then
+      leaks+=("verification-error:aws-identity-unavailable")
+    fi
+    verify_absent_api "cloudformation-stack:$STACK_NAME" \
+      "does not exist" \
+      aws cloudformation describe-stacks --stack-name "$STACK_NAME"
+    if [ -n "$BUCKET" ]; then
+      verify_absent_api "render-bucket:s3://$BUCKET" \
+        "404|Not Found|NoSuchBucket" \
+        aws s3api head-bucket --bucket "$BUCKET"
+    fi
+    if [ -n "$SAM_DEPLOY_BUCKET" ]; then
+      verify_absent_api "sam-bucket:s3://$SAM_DEPLOY_BUCKET" \
+        "404|Not Found|NoSuchBucket" \
+        aws s3api head-bucket --bucket "$SAM_DEPLOY_BUCKET"
+    fi
+    verify_absent_api "lambda-function:${PROJECT_NAME}-render" \
+      "ResourceNotFoundException|Function not found" \
+      aws lambda get-function --function-name "${PROJECT_NAME}-render"
+    if [ -n "$STATE_MACHINE_ARN" ]; then
+      verify_absent_api "state-machine:$STATE_MACHINE_ARN" \
+        "StateMachineDoesNotExist|does not exist" \
+        aws stepfunctions describe-state-machine --state-machine-arn "$STATE_MACHINE_ARN"
+    fi
+    verify_state_machine_name_absent "${PROJECT_NAME}-render"
+    local lambda_log="/aws/lambda/${PROJECT_NAME}-render"
+    local states_log="/aws/states/${PROJECT_NAME}-render"
+    verify_log_group_absent "$lambda_log"
+    verify_log_group_absent "$states_log"
+    if [ "${#leaks[@]}" -gt 0 ]; then
+      echo "ERROR: AWS cleanup verification found leaked resources:" >&2
+      printf '  - %s\n' "${leaks[@]}" >&2
+      if [ "$exit_code" -eq 0 ]; then
+        exit_code=7
+      fi
+    else
+      echo "→ Cleanup verified: no scoped AWS resources remain"
+    fi
+    mkdir -p "$ARTIFACT_DIR"
+    local cleanup_lines
+    cleanup_lines=$(mktemp)
+    if [ "${#leaks[@]}" -gt 0 ]; then
+      printf '%s\n' "${leaks[@]}" > "$cleanup_lines"
+    fi
+    jq -Rn \
+      --arg stackName "$STACK_NAME" \
+      --arg projectName "$PROJECT_NAME" \
+      --arg checkedAt "$(date -u +%Y-%m-%dT%H:%M:%SZ)" \
+      --argjson originalExitCode "${1:-0}" \
+      '{
+        stackName: $stackName,
+        projectName: $projectName,
+        checkedAt: $checkedAt,
+        originalExitCode: $originalExitCode,
+        leaks: [inputs | select(length > 0)],
+        cleanupVerified: false
+      } | .cleanupVerified = (.leaks | length == 0)' \
+      < "$cleanup_lines" > "$ARTIFACT_DIR/cleanup-verification.json"
+    rm -f "$cleanup_lines"
   fi
   exit "$exit_code"
 }
 
-# Trap unexpected failures (set -e trips, SIGINT, etc.) so we don't leak
-# the deployed stack + bucket on a non-routed error path. Explicit
-# cleanup_and_exit calls disarm the trap first so teardown runs once.
-trap 'cleanup_and_exit $?' EXIT
-
 # ── Pre-flight checks ─────────────────────────────────────────────────────
-for cmd in aws sam bun ffmpeg jq zip; do
+for cmd in aws sam bun ffmpeg ffprobe jq zip sha256sum cmp; do
   if ! command -v "$cmd" >/dev/null 2>&1; then
     echo "ERROR: '$cmd' not found on PATH." >&2
     exit 1
@@ -203,6 +398,25 @@ if ! aws sts get-caller-identity --output text >/dev/null 2>&1; then
   exit 1
 fi
 
+# This check runs before cleanup is armed or any resource is created.
+echo "→ Pre-flight: proving exact AWS resource names are unused"
+if ! hf_assert_deploy_isolation "$STACK_NAME" "$PROJECT_NAME"; then
+  echo "ERROR: refusing to reuse or clean resources not created by this run." >&2
+  exit 1
+fi
+
+# Arm cleanup before atomically reserving the stack name. If another smoke run
+# wins the create-stack race, ownership verification prevents this run from
+# touching it. If this run wins, every later destructive action requires the
+# same ownership tag.
+trap 'cleanup_and_exit $?' EXIT
+
+echo "→ Pre-flight: atomically reserving stack name for this smoke run"
+if ! hf_reserve_smoke_stack "$STACK_NAME" "$SMOKE_RUN_ID"; then
+  echo "ERROR: could not reserve stack name; another run may have won the race." >&2
+  cleanup_and_exit 1
+fi
+
 mkdir -p "$ARTIFACT_DIR/renders"
 
 # ── 1. Build the handler ZIP ──────────────────────────────────────────────
@@ -223,21 +437,29 @@ echo "→ SAM validate"
 (cd "$SAM_DIR" && sam validate --lint --region "$AWS_REGION")
 
 echo "→ SAM deploy (stack=$STACK_NAME, region=$AWS_REGION)"
-# ProjectName is intentionally NOT set to $STACK_NAME — the template
-# uses ProjectName only for the function/state-machine human-facing
-# names, and forcing it long here doesn't help. The BucketName is
-# auto-generated by CloudFormation per stack so concurrent smoke runs
-# don't collide. Pass --region explicitly here even though
-# AWS_DEFAULT_REGION is set, so a stray samconfig.toml in the working
-# directory can't override the script's choice.
+# Use a per-run resource prefix and deployment bucket. The template has
+# explicit FunctionName/StateMachineName properties, so leaving ProjectName
+# at its default makes concurrent smoke stacks overwrite/collide. A dedicated
+# SAM bucket also lets teardown remove every object created by this run.
+ACCOUNT_ID=$(aws sts get-caller-identity --query Account --output text)
+SAM_DEPLOY_BUCKET=$(hf_sam_deploy_bucket_name "$ACCOUNT_ID" "$AWS_REGION" "$SMOKE_RUN_ID")
+if [ "$AWS_REGION" = "us-east-1" ]; then
+  aws s3api create-bucket --bucket "$SAM_DEPLOY_BUCKET" >/dev/null
+else
+  aws s3api create-bucket \
+    --bucket "$SAM_DEPLOY_BUCKET" \
+    --create-bucket-configuration "LocationConstraint=$AWS_REGION" >/dev/null
+fi
 if ! (cd "$SAM_DIR" && sam deploy \
         --stack-name "$STACK_NAME" \
         --region "$AWS_REGION" \
-        --resolve-s3 \
+        --s3-bucket "$SAM_DEPLOY_BUCKET" \
         --capabilities CAPABILITY_IAM \
         --no-confirm-changeset \
         --no-fail-on-empty-changeset \
+        --tags "HyperframesSmokeRun=$SMOKE_RUN_ID" \
         --parameter-overrides \
+          "ProjectName=$PROJECT_NAME" \
           ChromeSource=sparticuz \
           "ReservedConcurrency=$RESERVED_CONCURRENCY"); then
   echo "ERROR: sam deploy failed; tearing down rollback'd stack..." >&2
@@ -254,6 +476,27 @@ STATE_MACHINE_ARN=$(aws cloudformation describe-stacks \
   --query "Stacks[0].Outputs[?OutputKey=='RenderStateMachineArn'].OutputValue" \
   --output text)
 echo "→ Stack outputs: bucket=$BUCKET state_machine=$STATE_MACHINE_ARN"
+jq -n \
+  --arg stackName "$STACK_NAME" \
+  --arg projectName "$PROJECT_NAME" \
+  --arg region "$AWS_REGION" \
+  --arg renderBucket "$BUCKET" \
+  --arg samDeployBucket "$SAM_DEPLOY_BUCKET" \
+  --arg lambdaFunction "${PROJECT_NAME}-render" \
+  --arg stateMachineArn "$STATE_MACHINE_ARN" \
+  --arg lambdaLogGroup "/aws/lambda/${PROJECT_NAME}-render" \
+  --arg statesLogGroup "/aws/states/${PROJECT_NAME}-render" \
+  '{
+    stackName: $stackName,
+    projectName: $projectName,
+    region: $region,
+    renderBucket: $renderBucket,
+    samDeployBucket: $samDeployBucket,
+    lambdaFunction: $lambdaFunction,
+    stateMachineArn: $stateMachineArn,
+    lambdaLogGroup: $lambdaLogGroup,
+    statesLogGroup: $statesLogGroup
+  }' > "$ARTIFACT_DIR/aws-resource-scope.json"
 
 # ── 4. Upload fixture as a project tarball ────────────────────────────────
 # tar.gz (not zip): Lambda's Node 22 base image ships GNU `tar` but not
@@ -267,6 +510,7 @@ rm -rf "$TMP_ARCHIVE"
 
 # ── 5. Render at each chunk count ─────────────────────────────────────────
 FIXTURE_META="$FIXTURE_DIR/meta.json"
+PSNR_THRESHOLD=$(hf_resolve_psnr_threshold "$PSNR_THRESHOLD" "$FIXTURE_META")
 BASE_FPS=$(jq -r '.renderConfig.fps // 30' "$FIXTURE_META")
 BASE_W=$(jq -r '.renderConfig.width // 640' "$FIXTURE_META")
 BASE_H=$(jq -r '.renderConfig.height // 360' "$FIXTURE_META")
@@ -275,13 +519,20 @@ RESULTS_JSON="$ARTIFACT_DIR/results.json"
 echo "[]" > "$RESULTS_JSON"
 
 IFS=',' read -ra COUNTS <<< "$CHUNK_COUNTS"
+if [ "$PLAN_PROTOCOL" = "both" ]; then
+  PROTOCOLS=(v1 v2)
+else
+  PROTOCOLS=("$PLAN_PROTOCOL")
+fi
+for PROTOCOL in "${PROTOCOLS[@]}"; do
 for N in "${COUNTS[@]}"; do
-  EXEC_NAME="smoke-N$N-$(date +%s)"
+  EXEC_NAME="smoke-$PROTOCOL-N$N-$(date +%s)"
   OUTPUT_KEY="renders/$EXEC_NAME/output.mp4"
   INPUT_JSON=$(jq -n \
     --arg project "s3://$BUCKET/projects/$FIXTURE.tar.gz" \
     --arg prefix "s3://$BUCKET/renders/$EXEC_NAME/" \
     --arg output "s3://$BUCKET/$OUTPUT_KEY" \
+    --arg protocol "$PROTOCOL" \
     --argjson n "$N" \
     --argjson fps "$BASE_FPS" \
     --argjson w "$BASE_W" \
@@ -290,6 +541,7 @@ for N in "${COUNTS[@]}"; do
       ProjectS3Uri: $project,
       PlanOutputS3Prefix: $prefix,
       OutputS3Uri: $output,
+      PlanProtocol: $protocol,
       Config: {
         fps: $fps,
         width: $w,
@@ -301,7 +553,7 @@ for N in "${COUNTS[@]}"; do
     }')
 
   echo
-  echo "================== N=$N =================="
+  echo "================== protocol=$PROTOCOL N=$N =================="
   echo "$INPUT_JSON" | jq .
 
   START_MS=$(date +%s%3N)
@@ -323,21 +575,21 @@ for N in "${COUNTS[@]}"; do
   WALL_MS=$((END_MS - START_MS))
 
   if [ "$STATUS" != "SUCCEEDED" ]; then
-    echo "ERROR: N=$N execution did not succeed ($STATUS)." >&2
+    echo "ERROR: protocol=$PROTOCOL N=$N execution did not succeed ($STATUS)." >&2
     aws stepfunctions describe-execution \
       --execution-arn "$EXEC_ARN" \
-      > "$ARTIFACT_DIR/renders/N$N-execution.json"
+      > "$ARTIFACT_DIR/renders/$PROTOCOL-N$N-execution.json"
     aws stepfunctions get-execution-history \
       --execution-arn "$EXEC_ARN" --max-results 200 \
-      > "$ARTIFACT_DIR/renders/N$N-history.json" || true
+      > "$ARTIFACT_DIR/renders/$PROTOCOL-N$N-history.json" || true
     cleanup_and_exit 4
   fi
 
   aws stepfunctions get-execution-history \
     --execution-arn "$EXEC_ARN" --max-results 1000 --output json \
-    > "$ARTIFACT_DIR/renders/N$N-history.json"
+    > "$ARTIFACT_DIR/renders/$PROTOCOL-N$N-history.json"
 
-  OUTPUT_LOCAL="$ARTIFACT_DIR/renders/N$N-output.mp4"
+  OUTPUT_LOCAL="$ARTIFACT_DIR/renders/$PROTOCOL-N$N-output.mp4"
   aws s3 cp "s3://$BUCKET/$OUTPUT_KEY" "$OUTPUT_LOCAL"
 
   PSNR_LOG=$(mktemp)
@@ -363,34 +615,75 @@ for N in "${COUNTS[@]}"; do
   ' "$PSNR_LOG")
   rm -f "$PSNR_LOG"
 
-  echo "N=$N  wall=${WALL_MS}ms  psnr=${PSNR_AVG} dB"
+  echo "protocol=$PROTOCOL N=$N  wall=${WALL_MS}ms  psnr=${PSNR_AVG} dB"
   jq --argjson n "$N" \
      --argjson wall "$WALL_MS" \
      --arg psnr "$PSNR_AVG" \
-     '. += [{chunkCount: $n, wallClockMs: $wall, psnrAvgDb: ($psnr|tonumber), output: "renders/N\($n)-output.mp4", history: "renders/N\($n)-history.json"}]' \
+     --arg protocol "$PROTOCOL" \
+     '. += [{planProtocol: $protocol, chunkCount: $n, wallClockMs: $wall, psnrAvgDb: ($psnr|tonumber), output: "renders/\($protocol)-N\($n)-output.mp4", history: "renders/\($protocol)-N\($n)-history.json"}]' \
      "$RESULTS_JSON" > "$RESULTS_JSON.tmp" && mv "$RESULTS_JSON.tmp" "$RESULTS_JSON"
 done
+done
 
-# ── 6. Gate on PSNR threshold ─────────────────────────────────────────────
+# ── 6. Direct v1 ↔ v2 semantic equivalence ────────────────────────────────
+SEMANTIC_FAILED=0
+SEMANTIC_RESULTS_JSON="$ARTIFACT_DIR/semantic-comparisons.json"
+echo "[]" > "$SEMANTIC_RESULTS_JSON"
+if [ "$PLAN_PROTOCOL" = "both" ]; then
+  for N in "${COUNTS[@]}"; do
+    V1_OUTPUT="$ARTIFACT_DIR/renders/v1-N$N-output.mp4"
+    V2_OUTPUT="$ARTIFACT_DIR/renders/v2-N$N-output.mp4"
+    V1_HISTORY="$ARTIFACT_DIR/renders/v1-N$N-history.json"
+    V2_HISTORY="$ARTIFACT_DIR/renders/v2-N$N-history.json"
+    SEMANTIC_PREFIX="$ARTIFACT_DIR/renders/v1-v2-N$N"
+    COMPARE_STATUS=0
+    if hf_compare_render_semantics \
+      "$V1_OUTPUT" "$V2_OUTPUT" "$SEMANTIC_PREFIX" "$V1_HISTORY" "$V2_HISTORY"; then
+      echo "PASS: v1/v2 semantic equivalence at N=$N"
+    else
+      COMPARE_STATUS=$?
+      if [ ! -f "${SEMANTIC_PREFIX}.json" ]; then
+        jq -n --argjson status "$COMPARE_STATUS" \
+          '{semanticEqual: false, comparisonError: true, comparisonExitCode: $status}' \
+          > "${SEMANTIC_PREFIX}.json"
+      fi
+      echo "FAIL: v1/v2 semantic comparison at N=$N exited $COMPARE_STATUS (see ${SEMANTIC_PREFIX}.json)" >&2
+      SEMANTIC_FAILED=$((SEMANTIC_FAILED + 1))
+    fi
+    jq --argjson n "$N" --slurpfile comparison "${SEMANTIC_PREFIX}.json" \
+      '. += [($comparison[0] + {chunkCount: $n})]' \
+      "$SEMANTIC_RESULTS_JSON" > "$SEMANTIC_RESULTS_JSON.tmp" &&
+      mv "$SEMANTIC_RESULTS_JSON.tmp" "$SEMANTIC_RESULTS_JSON"
+    jq -r '"  chunks=\(.chunks.equal // "error") decoded-video=\(.video.equal // "error") audio=\(.audio.equal // "error") metadata=\(.metadata.equal // "error") duration=\(.duration.equal // "error") encoded-sha=\(.encoded.equal // "error") (informational unless gated)"' \
+      "${SEMANTIC_PREFIX}.json"
+  done
+fi
+
+# ── 7. Gate on baseline PSNR threshold ────────────────────────────────────
 FAILED=0
 while read -r row; do
   N=$(echo "$row" | jq -r .chunkCount)
+  PROTOCOL=$(echo "$row" | jq -r .planProtocol)
   P=$(echo "$row" | jq -r .psnrAvgDb)
   if awk -v p="$P" -v t="$PSNR_THRESHOLD" 'BEGIN{exit !(p<t)}'; then
-    echo "FAIL: N=$N PSNR=$P dB below threshold $PSNR_THRESHOLD" >&2
+    echo "FAIL: protocol=$PROTOCOL N=$N PSNR=$P dB below threshold $PSNR_THRESHOLD" >&2
     FAILED=$((FAILED + 1))
   fi
 done < <(jq -c '.[]' "$RESULTS_JSON")
 
-# ── 7. Summary ────────────────────────────────────────────────────────────
+# ── 8. Summary ────────────────────────────────────────────────────────────
 echo
 echo "================ RESULTS ================"
-printf '%-10s %-12s %-10s\n' "ChunkCount" "WallMs" "PSNR (dB)"
-jq -r '.[] | [.chunkCount, .wallClockMs, .psnrAvgDb] | @tsv' "$RESULTS_JSON" \
-  | awk -F'\t' '{printf "%-10s %-12s %-10s\n", $1, $2, $3}'
+printf '%-10s %-10s %-12s %-10s\n' "Protocol" "ChunkCount" "WallMs" "PSNR (dB)"
+jq -r '.[] | [.planProtocol, .chunkCount, .wallClockMs, .psnrAvgDb] | @tsv' "$RESULTS_JSON" \
+  | awk -F'\t' '{printf "%-10s %-10s %-12s %-10s\n", $1, $2, $3, $4}'
 echo
 echo "Artifacts: $ARTIFACT_DIR"
 
+if [ "$SEMANTIC_FAILED" -gt 0 ]; then
+  echo "FAILED ($SEMANTIC_FAILED v1/v2 semantic mismatches)" >&2
+  cleanup_and_exit 6
+fi
 if [ "$FAILED" -gt 0 ]; then
   echo "FAILED ($FAILED renders below PSNR threshold)" >&2
   cleanup_and_exit 5
diff --git a/examples/aws-lambda/template.yaml b/examples/aws-lambda/template.yaml
index 86921eb89..fb2a15973 100644
--- a/examples/aws-lambda/template.yaml
+++ b/examples/aws-lambda/template.yaml
@@ -158,6 +158,7 @@ Resources:
           # Lambda's Node 22 runtime sets these by default; explicit for
           # clarity + so users can override during local SAM invoke.
           TMPDIR: /tmp
+          HYPERFRAMES_RENDER_BUCKET: !Ref RenderBucket
       Policies:
         - S3CrudPolicy:
             BucketName: !Ref RenderBucket
@@ -207,8 +208,27 @@ Resources:
         # compound into a multi-hour execution. The longest legitimate
         # render observed in PR 880's eval was ~3 minutes.
         TimeoutSeconds: 3600
-        StartAt: Plan
+        StartAt: SelectPlanProtocol
         States:
+          SelectPlanProtocol:
+            Type: Choice
+            Choices:
+              - Variable: $.PlanProtocol
+                StringEquals: v2
+                Next: PlanV2
+              - Variable: $.PlanProtocol
+                StringEquals: v1
+                Next: Plan
+              - Variable: $.PlanProtocol
+                IsPresent: true
+                Next: UnsupportedPlanProtocol
+            Default: Plan
+
+          UnsupportedPlanProtocol:
+            Type: Fail
+            Error: PLAN_PROTOCOL_UNSUPPORTED
+            Cause: PlanProtocol must be "v1", "v2", or absent (defaults to v1).
+
           Plan:
             Type: Task
             Resource: arn:aws:states:::lambda:invoke
@@ -220,6 +240,7 @@ Resources:
                 PlanOutputS3Prefix.$: "$.PlanOutputS3Prefix"
                 Config.$: "$.Config"
             ResultSelector:
+              PlanProtocol: v1
               PlanS3Uri.$: "$.Payload.PlanS3Uri"
               PlanHash.$: "$.Payload.PlanHash"
               ChunkCount.$: "$.Payload.ChunkCount"
@@ -239,6 +260,10 @@ Resources:
                   - BROWSER_GPU_NOT_SOFTWARE
                   - FONT_FETCH_FAILED
                   - PLAN_TOO_LARGE
+                  - PlanTooLargeError
+                  - PLAN_PROTOCOL_UNSUPPORTED
+                  - PlanProtocolUnsupportedError
+                  - PLAN_ARTIFACT_DIGEST_MISMATCH
                   - FORMAT_NOT_SUPPORTED_IN_DISTRIBUTED
                 MaxAttempts: 0
               - ErrorEquals: [States.ALL]
@@ -248,6 +273,50 @@ Resources:
                 MaxDelaySeconds: 60
             Next: BuildChunkList
 
+          PlanV2:
+            Type: Task
+            Resource: arn:aws:states:::lambda:invoke
+            Parameters:
+              FunctionName: !GetAtt RenderFunction.Arn
+              Payload:
+                Action: plan
+                PlanProtocol: v2
+                ProjectS3Uri.$: "$.ProjectS3Uri"
+                PlanOutputS3Prefix.$: "$.PlanOutputS3Prefix"
+                Config.$: "$.Config"
+            ResultSelector:
+              PlanProtocol: v2
+              PlanV2ManifestS3Uri.$: "$.Payload.PlanV2ManifestS3Uri"
+              PlanV2ArtifactS3Prefix.$: "$.Payload.PlanV2ArtifactS3Prefix"
+              PlanHash.$: "$.Payload.PlanHash"
+              ChunkCount.$: "$.Payload.ChunkCount"
+              Format.$: "$.Payload.Format"
+              HasAudio.$: "$.Payload.HasAudio"
+            ResultPath: $.Plan
+            Retry:
+              - ErrorEquals:
+                  - FFMPEG_VERSION_MISMATCH
+                  - PLAN_HASH_MISMATCH
+                  - S3_URI_NOT_ALLOWED
+                  - BROWSER_GPU_NOT_SOFTWARE
+                  - FONT_FETCH_FAILED
+                  - PLAN_TOO_LARGE
+                  - PlanTooLargeError
+                  - PLAN_PROTOCOL_UNSUPPORTED
+                  - PlanProtocolUnsupportedError
+                  - PLAN_V2_INTEGRITY_UNRECOVERABLE
+                  - PlanV2IntegrityError
+                  - PLAN_ARTIFACT_DIGEST_MISMATCH
+                  - FORMAT_NOT_SUPPORTED_IN_DISTRIBUTED
+                  - ChromeBinaryUnavailableError
+                MaxAttempts: 0
+              - ErrorEquals: [States.ALL]
+                IntervalSeconds: 2
+                MaxAttempts: 4
+                BackoffRate: 2
+                MaxDelaySeconds: 60
+            Next: BuildChunkList
+
           BuildChunkList:
             # Translate ChunkCount into an array `[0, 1, ..., N-1]` so the
             # Map state below has something to iterate. Range is the
@@ -269,7 +338,7 @@ Resources:
             Choices:
               - Variable: $.Plan.ChunkCount
                 NumericGreaterThan: 0
-                Next: RenderChunks
+                Next: SelectWorkerProtocol
             Default: PlanProducedZeroChunks
 
           PlanProducedZeroChunks:
@@ -277,6 +346,14 @@ Resources:
             Error: PLAN_TOO_LARGE
             Cause: Plan returned ChunkCount=0 — non-retryable producer-side invariant violation.
 
+          SelectWorkerProtocol:
+            Type: Choice
+            Choices:
+              - Variable: $.Plan.PlanProtocol
+                StringEquals: v2
+                Next: RenderChunksV2
+            Default: RenderChunks
+
           RenderChunks:
             Type: Map
             ItemsPath: $.Iterator.ChunkIndexes
@@ -320,6 +397,11 @@ Resources:
                         - FFMPEG_VERSION_MISMATCH
                         - PLAN_HASH_MISMATCH
                         - BROWSER_GPU_NOT_SOFTWARE
+                        - PLAN_TOO_LARGE
+                        - PlanTooLargeError
+                        - PLAN_PROTOCOL_UNSUPPORTED
+                        - PlanProtocolUnsupportedError
+                        - PLAN_ARTIFACT_DIGEST_MISMATCH
                       MaxAttempts: 0
                     - ErrorEquals: [States.ALL]
                       IntervalSeconds: 2
@@ -356,6 +438,111 @@ Resources:
                   - FFMPEG_VERSION_MISMATCH
                   - PLAN_HASH_MISMATCH
                   - FORMAT_NOT_SUPPORTED_IN_DISTRIBUTED
+                  - PLAN_TOO_LARGE
+                  - PlanTooLargeError
+                  - PLAN_PROTOCOL_UNSUPPORTED
+                  - PlanProtocolUnsupportedError
+                  - PLAN_ARTIFACT_DIGEST_MISMATCH
+                MaxAttempts: 0
+              - ErrorEquals: [States.ALL]
+                IntervalSeconds: 2
+                MaxAttempts: 4
+                BackoffRate: 2
+                MaxDelaySeconds: 60
+            End: true
+
+          RenderChunksV2:
+            Type: Map
+            ItemsPath: $.Iterator.ChunkIndexes
+            ItemSelector:
+              ChunkIndex.$: "$$.Map.Item.Value"
+              PlanV2ManifestS3Uri.$: "$.Plan.PlanV2ManifestS3Uri"
+              PlanV2ArtifactS3Prefix.$: "$.Plan.PlanV2ArtifactS3Prefix"
+              PlanHash.$: "$.Plan.PlanHash"
+              ChunkOutputS3Prefix.$: "$.PlanOutputS3Prefix"
+              Format.$: "$.Plan.Format"
+            MaxConcurrencyPath: $.Plan.ChunkCount
+            ResultPath: $.Chunks
+            ItemProcessor:
+              ProcessorConfig:
+                Mode: INLINE
+              StartAt: RenderChunkV2
+              States:
+                RenderChunkV2:
+                  Type: Task
+                  Resource: arn:aws:states:::lambda:invoke
+                  Parameters:
+                    FunctionName: !GetAtt RenderFunction.Arn
+                    Payload:
+                      Action: renderChunk
+                      PlanProtocol: v2
+                      ChunkIndex.$: "$.ChunkIndex"
+                      PlanV2ManifestS3Uri.$: "$.PlanV2ManifestS3Uri"
+                      PlanV2ArtifactS3Prefix.$: "$.PlanV2ArtifactS3Prefix"
+                      PlanHash.$: "$.PlanHash"
+                      ChunkOutputS3Prefix.$: "$.ChunkOutputS3Prefix"
+                      Format.$: "$.Format"
+                  ResultSelector:
+                    ChunkS3Uri.$: "$.Payload.ChunkS3Uri"
+                    ChunkIndex.$: "$.Payload.ChunkIndex"
+                    Sha256.$: "$.Payload.Sha256"
+                  Retry:
+                    - ErrorEquals:
+                        - FFMPEG_VERSION_MISMATCH
+                        - PLAN_HASH_MISMATCH
+                        - S3_URI_NOT_ALLOWED
+                        - BROWSER_GPU_NOT_SOFTWARE
+                        - PLAN_TOO_LARGE
+                        - PlanTooLargeError
+                        - PLAN_PROTOCOL_UNSUPPORTED
+                        - PlanProtocolUnsupportedError
+                        - PLAN_V2_INTEGRITY_UNRECOVERABLE
+                        - PlanV2IntegrityError
+                        - PLAN_ARTIFACT_DIGEST_MISMATCH
+                        - ChromeBinaryUnavailableError
+                      MaxAttempts: 0
+                    - ErrorEquals: [States.ALL]
+                      IntervalSeconds: 2
+                      MaxAttempts: 4
+                      BackoffRate: 2
+                      MaxDelaySeconds: 60
+                  End: true
+            Next: AssembleV2
+
+          AssembleV2:
+            Type: Task
+            Resource: arn:aws:states:::lambda:invoke
+            Parameters:
+              FunctionName: !GetAtt RenderFunction.Arn
+              Payload:
+                Action: assemble
+                PlanProtocol: v2
+                PlanV2ManifestS3Uri.$: "$.Plan.PlanV2ManifestS3Uri"
+                PlanV2ArtifactS3Prefix.$: "$.Plan.PlanV2ArtifactS3Prefix"
+                PlanHash.$: "$.Plan.PlanHash"
+                ChunkS3Uris.$: "$.Chunks[*].ChunkS3Uri"
+                AudioS3Uri: null
+                OutputS3Uri.$: "$.OutputS3Uri"
+                Format.$: "$.Plan.Format"
+            ResultSelector:
+              OutputS3Uri.$: "$.Payload.OutputS3Uri"
+              FramesEncoded.$: "$.Payload.FramesEncoded"
+              FileSize.$: "$.Payload.FileSize"
+            ResultPath: $.Output
+            Retry:
+              - ErrorEquals:
+                  - FFMPEG_VERSION_MISMATCH
+                  - PLAN_HASH_MISMATCH
+                  - S3_URI_NOT_ALLOWED
+                  - FORMAT_NOT_SUPPORTED_IN_DISTRIBUTED
+                  - PLAN_TOO_LARGE
+                  - PlanTooLargeError
+                  - PLAN_PROTOCOL_UNSUPPORTED
+                  - PlanProtocolUnsupportedError
+                  - PLAN_V2_INTEGRITY_UNRECOVERABLE
+                  - PlanV2IntegrityError
+                  - PLAN_ARTIFACT_DIGEST_MISMATCH
+                  - ChromeBinaryUnavailableError
                 MaxAttempts: 0
               - ErrorEquals: [States.ALL]
                 IntervalSeconds: 2
diff --git a/packages/aws-lambda/README.md b/packages/aws-lambda/README.md
index 492637d18..8f462ad19 100644
--- a/packages/aws-lambda/README.md
+++ b/packages/aws-lambda/README.md
@@ -37,7 +37,7 @@ smoke flow; the SDK + CDK are the supported public surface for adopters.
                               │ pure functions over local paths
                               ▼
 ┌──────────────────────────────────────────────────────────────────┐
-│ S3 bucket — plan tarball + per-chunk outputs + final mp4         │
+│ S3 bucket — v1 plan tar or v2 manifest/blobs + chunks + output  │
 └──────────────────────────────────────────────────────────────────┘
 ```
 
@@ -45,6 +45,26 @@ The handler downloads inputs from S3 into `/tmp`, calls the OSS primitive,
 uploads outputs back to S3, and returns a small JSON result that fits
 inside Step Functions' history budget (under 200 bytes per chunk).
 
+### Plan transport selection
+
+`renderToLambda` defaults to the existing monolithic v1 plan transport.
+Plan v2 is an explicit whole-render opt-in:
+
+```ts
+await renderToLambda({
+  // ...bucket, state machine, project, and config...
+  planProtocol: "v2",
+});
+```
+
+V2 never overloads `PlanS3Uri`. The planner returns
+`PlanV2ManifestS3Uri` and `PlanV2ArtifactS3Prefix`; chunk workers fetch
+only manifest-selected chunk artifacts, while the assembler fetches its
+own metadata and audio subset. Blobs are immutable SHA-256-addressed
+objects, verified on upload and download, and the manifest is published
+last. Unknown protocols and digest mismatches are terminal Step Functions
+errors. Omit the selector—or use `"v1"`—to retain the prior wire contract.
+
 ## Chrome runtime
 
 The package supports two Chromium sources:
diff --git a/packages/aws-lambda/package.json b/packages/aws-lambda/package.json
index d9773e20b..2a189e2df 100644
--- a/packages/aws-lambda/package.json
+++ b/packages/aws-lambda/package.json
@@ -86,7 +86,8 @@
     "constructs": "^10.3.0",
     "esbuild": "^0.25.12",
     "tsx": "^4.21.0",
-    "typescript": "^5.7.2"
+    "typescript": "^5.7.2",
+    "yaml": "^2.9.0"
   },
   "peerDependencies": {
     "aws-cdk-lib": "^2.130.0",
diff --git a/packages/aws-lambda/src/cdk/HyperframesRenderStack.snapshot.test.ts b/packages/aws-lambda/src/cdk/HyperframesRenderStack.snapshot.test.ts
index b1d08f853..e5ef15d74 100644
--- a/packages/aws-lambda/src/cdk/HyperframesRenderStack.snapshot.test.ts
+++ b/packages/aws-lambda/src/cdk/HyperframesRenderStack.snapshot.test.ts
@@ -20,11 +20,12 @@
  */
 
 import { beforeAll, describe, expect, it } from "bun:test";
-import { mkdtempSync, writeFileSync } from "node:fs";
+import { mkdtempSync, readFileSync, writeFileSync } from "node:fs";
 import { tmpdir } from "node:os";
 import { join } from "node:path";
 import { App, Stack } from "aws-cdk-lib";
 import { Template } from "aws-cdk-lib/assertions";
+import { parse as parseYaml } from "yaml";
 import { HyperframesRenderStack } from "./HyperframesRenderStack.js";
 
 // CDK synth + Template.fromStack is slow on cold start in CI (~5-8s on
@@ -50,22 +51,33 @@ const EXPECTED_RESOURCE_COUNTS: Record<string, number> = {
 // `RenderChunk` task lives nested under `RenderChunks.Iterator.States`,
 // not at this level — we cover it separately in the contract test.
 const EXPECTED_STATE_NAMES = [
+  "SelectPlanProtocol",
   "Plan",
+  "PlanV2",
   "BuildChunkList",
   "AssertChunkCount",
+  "SelectWorkerProtocol",
   "RenderChunks",
+  "RenderChunksV2",
   "Assemble",
+  "AssembleV2",
   "PlanProducedZeroChunks",
+  "UnsupportedPlanProtocol",
 ];
 
 const EXPECTED_NON_RETRYABLE_ERRORS = new Set([
   "FFMPEG_VERSION_MISMATCH",
   "PLAN_HASH_MISMATCH",
+  "S3_URI_NOT_ALLOWED",
   "BROWSER_GPU_NOT_SOFTWARE",
   "FONT_FETCH_FAILED",
   "PLAN_TOO_LARGE",
+  "PlanTooLargeError",
   "PLAN_PROTOCOL_UNSUPPORTED",
   "PlanProtocolUnsupportedError",
+  "PLAN_V2_INTEGRITY_UNRECOVERABLE",
+  "PlanV2IntegrityError",
+  "PLAN_ARTIFACT_DIGEST_MISMATCH",
   "FORMAT_NOT_SUPPORTED_IN_DISTRIBUTED",
   "ChromeBinaryUnavailableError",
 ]);
@@ -130,7 +142,7 @@ describe("HyperframesRenderStack — snapshot", () => {
 
   it("declares the state machine with the expected state names", () => {
     const { definition } = SYNTHED;
-    expect(definition.StartAt).toBe("Plan");
+    expect(definition.StartAt).toBe("SelectPlanProtocol");
     const actualStates = Object.keys(definition.States);
     expect(actualStates.sort()).toEqual([...EXPECTED_STATE_NAMES].sort());
   });
@@ -140,7 +152,7 @@ describe("HyperframesRenderStack — snapshot", () => {
     const collected = new Set<string>();
     // Plan + Assemble are top-level states; RenderChunk is nested inside
     // the Map's Iterator definition.
-    const topLevelStates = ["Plan", "Assemble"] as const;
+    const topLevelStates = ["Plan", "PlanV2", "Assemble", "AssembleV2"] as const;
     for (const stateName of topLevelStates) {
       collectNonRetryableErrors(definition.States[stateName], collected);
     }
@@ -152,6 +164,15 @@ describe("HyperframesRenderStack — snapshot", () => {
       | undefined;
     const innerStates = renderChunks?.Iterator?.States ?? renderChunks?.ItemProcessor?.States ?? {};
     collectNonRetryableErrors(innerStates.RenderChunk, collected);
+    const renderChunksV2 = definition.States.RenderChunksV2 as
+      | {
+          Iterator?: { States?: Record<string, unknown> };
+          ItemProcessor?: { States?: Record<string, unknown> };
+        }
+      | undefined;
+    const innerStatesV2 =
+      renderChunksV2?.Iterator?.States ?? renderChunksV2?.ItemProcessor?.States ?? {};
+    collectNonRetryableErrors(innerStatesV2.RenderChunkV2, collected);
 
     for (const expected of EXPECTED_NON_RETRYABLE_ERRORS) {
       expect({ error: expected, present: collected.has(expected) }).toEqual({
@@ -160,6 +181,52 @@ describe("HyperframesRenderStack — snapshot", () => {
       });
     }
   });
+
+  it("classifies plan v2 integrity failures as terminal in every v2 Lambda task", () => {
+    const v2TaskStates = Object.values(getV2TaskStates(SYNTHED.definition));
+
+    for (const state of v2TaskStates) {
+      const errors = new Set<string>();
+      collectNonRetryableErrors(state, errors);
+      expect(errors.has("PLAN_V2_INTEGRITY_UNRECOVERABLE")).toBe(true);
+      expect(errors.has("PlanV2IntegrityError")).toBe(true);
+    }
+  });
+
+  it("keeps SAM and CDK terminal classifiers identical for every v2 Lambda task", () => {
+    const cdkTasks = getV2TaskStates(SYNTHED.definition);
+    const samTasks = getV2TaskStates(readSamDefinition());
+
+    for (const taskName of ["PlanV2", "RenderChunkV2", "AssembleV2"] as const) {
+      const cdkErrors = new Set<string>();
+      const samErrors = new Set<string>();
+      collectNonRetryableErrors(cdkTasks[taskName], cdkErrors);
+      collectNonRetryableErrors(samTasks[taskName], samErrors);
+      expect({ taskName, errors: [...samErrors].sort() }).toEqual({
+        taskName,
+        errors: [...cdkErrors].sort(),
+      });
+    }
+  });
+
+  it("keeps v1 and v2 locators disjoint across orchestration branches", () => {
+    const { definition } = SYNTHED;
+    const v1 = JSON.stringify({
+      plan: definition.States.Plan,
+      chunks: definition.States.RenderChunks,
+      assemble: definition.States.Assemble,
+    });
+    const v2 = JSON.stringify({
+      plan: definition.States.PlanV2,
+      chunks: definition.States.RenderChunksV2,
+      assemble: definition.States.AssembleV2,
+    });
+    expect(v1).toContain("PlanS3Uri");
+    expect(v1).not.toContain("PlanV2ManifestS3Uri");
+    expect(v2).toContain("PlanV2ManifestS3Uri");
+    expect(v2).toContain("PlanV2ArtifactS3Prefix");
+    expect(v2).not.toContain("PlanS3Uri");
+  });
 });
 
 function collectNonRetryableErrors(state: unknown, out: Set<string>): void {
@@ -171,3 +238,66 @@ function collectNonRetryableErrors(state: unknown, out: Set<string>): void {
     }
   }
 }
+
+function isRecord(value: unknown): value is Record<string, unknown> {
+  return typeof value === "object" && value !== null && !Array.isArray(value);
+}
+
+function requireRecord(value: unknown, label: string): Record<string, unknown> {
+  if (!isRecord(value)) throw new Error(`${label} must be an object`);
+  return value;
+}
+
+function requireRecordProperty(
+  record: Record<string, unknown>,
+  property: string,
+  label: string,
+): Record<string, unknown> {
+  return requireRecord(record[property], label);
+}
+
+function getV2TaskStates(definition: {
+  States: Record<string, unknown>;
+}): Record<"PlanV2" | "RenderChunkV2" | "AssembleV2", unknown> {
+  const renderChunksV2 = requireRecord(definition.States.RenderChunksV2, "RenderChunksV2 state");
+  const processor = isRecord(renderChunksV2.Iterator)
+    ? renderChunksV2.Iterator
+    : requireRecord(renderChunksV2.ItemProcessor, "RenderChunksV2 processor");
+  const innerStates = requireRecord(processor.States, "RenderChunksV2 processor states");
+  return {
+    PlanV2: definition.States.PlanV2,
+    RenderChunkV2: innerStates.RenderChunkV2,
+    AssembleV2: definition.States.AssembleV2,
+  };
+}
+
+function readSamDefinition(): { States: Record<string, unknown> } {
+  const source = readFileSync(
+    new URL("../../../../examples/aws-lambda/template.yaml", import.meta.url),
+    "utf8",
+  );
+  // CloudFormation intrinsic tags are irrelevant to classifier parity. The
+  // YAML parser preserves their scalar values while this option suppresses
+  // warnings for the intentionally unresolved `!Ref`/`!GetAtt` tags.
+  const parsed: unknown = parseYaml(source, { logLevel: "silent" });
+  const root = requireRecord(parsed, "SAM template");
+  const resources = requireRecordProperty(root, "Resources", "SAM resources");
+  const stateMachine = requireRecordProperty(
+    resources,
+    "RenderStateMachine",
+    "SAM RenderStateMachine",
+  );
+  const properties = requireRecordProperty(
+    stateMachine,
+    "Properties",
+    "SAM state-machine properties",
+  );
+  const definition = requireRecordProperty(
+    properties,
+    "Definition",
+    "SAM state-machine definition",
+  );
+  return {
+    States: requireRecordProperty(definition, "States", "SAM state-machine states"),
+  };
+}
diff --git a/packages/aws-lambda/src/cdk/HyperframesRenderStack.ts b/packages/aws-lambda/src/cdk/HyperframesRenderStack.ts
index 86d626d3f..9cbbb1a2f 100644
--- a/packages/aws-lambda/src/cdk/HyperframesRenderStack.ts
+++ b/packages/aws-lambda/src/cdk/HyperframesRenderStack.ts
@@ -200,8 +200,12 @@ export class HyperframesRenderStack extends Construct {
       "BROWSER_GPU_NOT_SOFTWARE",
       "FONT_FETCH_FAILED",
       "PLAN_TOO_LARGE",
+      "PlanTooLargeError",
       "PLAN_PROTOCOL_UNSUPPORTED",
       "PlanProtocolUnsupportedError",
+      "PLAN_V2_INTEGRITY_UNRECOVERABLE",
+      "PlanV2IntegrityError",
+      "PLAN_ARTIFACT_DIGEST_MISMATCH",
       "FORMAT_NOT_SUPPORTED_IN_DISTRIBUTED",
       "ChromeBinaryUnavailableError",
     ];
@@ -210,8 +214,13 @@ export class HyperframesRenderStack extends Construct {
       "PLAN_HASH_MISMATCH",
       "S3_URI_NOT_ALLOWED",
       "BROWSER_GPU_NOT_SOFTWARE",
+      "PLAN_TOO_LARGE",
+      "PlanTooLargeError",
       "PLAN_PROTOCOL_UNSUPPORTED",
       "PlanProtocolUnsupportedError",
+      "PLAN_V2_INTEGRITY_UNRECOVERABLE",
+      "PlanV2IntegrityError",
+      "PLAN_ARTIFACT_DIGEST_MISMATCH",
       "ChromeBinaryUnavailableError",
     ];
     const NON_RETRYABLE_ASSEMBLE = [
@@ -220,7 +229,12 @@ export class HyperframesRenderStack extends Construct {
       "S3_URI_NOT_ALLOWED",
       "PLAN_PROTOCOL_UNSUPPORTED",
       "PlanProtocolUnsupportedError",
+      "PLAN_V2_INTEGRITY_UNRECOVERABLE",
+      "PlanV2IntegrityError",
       "FORMAT_NOT_SUPPORTED_IN_DISTRIBUTED",
+      "PLAN_TOO_LARGE",
+      "PlanTooLargeError",
+      "PLAN_ARTIFACT_DIGEST_MISMATCH",
       "ChromeBinaryUnavailableError",
     ];
 
@@ -233,6 +247,7 @@ export class HyperframesRenderStack extends Construct {
         "Config.$": "$.Config",
       }),
       resultSelector: {
+        PlanProtocol: "v1",
         "PlanS3Uri.$": "$.Payload.PlanS3Uri",
         "PlanHash.$": "$.Payload.PlanHash",
         "ChunkCount.$": "$.Payload.ChunkCount",
@@ -254,6 +269,35 @@ export class HyperframesRenderStack extends Construct {
       maxDelay: Duration.seconds(60),
     });
 
+    const planV2 = new tasks.LambdaInvoke(this, "PlanV2", {
+      lambdaFunction: this.renderFunction,
+      payload: sfn.TaskInput.fromObject({
+        Action: "plan",
+        PlanProtocol: "v2",
+        "ProjectS3Uri.$": "$.ProjectS3Uri",
+        "PlanOutputS3Prefix.$": "$.PlanOutputS3Prefix",
+        "Config.$": "$.Config",
+      }),
+      resultSelector: {
+        PlanProtocol: "v2",
+        "PlanV2ManifestS3Uri.$": "$.Payload.PlanV2ManifestS3Uri",
+        "PlanV2ArtifactS3Prefix.$": "$.Payload.PlanV2ArtifactS3Prefix",
+        "PlanHash.$": "$.Payload.PlanHash",
+        "ChunkCount.$": "$.Payload.ChunkCount",
+        "Format.$": "$.Payload.Format",
+        "HasAudio.$": "$.Payload.HasAudio",
+      },
+      resultPath: "$.Plan",
+    });
+    planV2.addRetry({ errors: NON_RETRYABLE_PLAN, maxAttempts: 0 });
+    planV2.addRetry({
+      errors: ["States.ALL"],
+      interval: Duration.seconds(2),
+      maxAttempts: 4,
+      backoffRate: 2,
+      maxDelay: Duration.seconds(60),
+    });
+
     const buildChunkList = new sfn.Pass(this, "BuildChunkList", {
       parameters: {
         "ChunkIndexes.$": "States.ArrayRange(0, States.MathAdd($.Plan.ChunkCount, -1), 1)",
@@ -337,11 +381,100 @@ export class HyperframesRenderStack extends Construct {
       maxDelay: Duration.seconds(60),
     });
 
+    const renderChunkV2Task = new tasks.LambdaInvoke(this, "RenderChunkV2", {
+      lambdaFunction: this.renderFunction,
+      payload: sfn.TaskInput.fromObject({
+        Action: "renderChunk",
+        PlanProtocol: "v2",
+        "ChunkIndex.$": "$.ChunkIndex",
+        "PlanV2ManifestS3Uri.$": "$.PlanV2ManifestS3Uri",
+        "PlanV2ArtifactS3Prefix.$": "$.PlanV2ArtifactS3Prefix",
+        "PlanHash.$": "$.PlanHash",
+        "ChunkOutputS3Prefix.$": "$.ChunkOutputS3Prefix",
+        "Format.$": "$.Format",
+      }),
+      resultSelector: {
+        "ChunkS3Uri.$": "$.Payload.ChunkS3Uri",
+        "ChunkIndex.$": "$.Payload.ChunkIndex",
+        "Sha256.$": "$.Payload.Sha256",
+      },
+    });
+    renderChunkV2Task.addRetry({ errors: NON_RETRYABLE_CHUNK, maxAttempts: 0 });
+    renderChunkV2Task.addRetry({
+      errors: ["States.ALL"],
+      interval: Duration.seconds(2),
+      maxAttempts: 4,
+      backoffRate: 2,
+      maxDelay: Duration.seconds(60),
+    });
+
+    const renderChunksV2 = new sfn.Map(this, "RenderChunksV2", {
+      itemsPath: "$.Iterator.ChunkIndexes",
+      itemSelector: {
+        "ChunkIndex.$": "$$.Map.Item.Value",
+        "PlanV2ManifestS3Uri.$": "$.Plan.PlanV2ManifestS3Uri",
+        "PlanV2ArtifactS3Prefix.$": "$.Plan.PlanV2ArtifactS3Prefix",
+        "PlanHash.$": "$.Plan.PlanHash",
+        "ChunkOutputS3Prefix.$": "$.PlanOutputS3Prefix",
+        "Format.$": "$.Plan.Format",
+      },
+      maxConcurrencyPath: "$.Plan.ChunkCount",
+      resultPath: "$.Chunks",
+    });
+    renderChunksV2.itemProcessor(renderChunkV2Task);
+
+    const assembleV2 = new tasks.LambdaInvoke(this, "AssembleV2", {
+      lambdaFunction: this.renderFunction,
+      payload: sfn.TaskInput.fromObject({
+        Action: "assemble",
+        PlanProtocol: "v2",
+        "PlanV2ManifestS3Uri.$": "$.Plan.PlanV2ManifestS3Uri",
+        "PlanV2ArtifactS3Prefix.$": "$.Plan.PlanV2ArtifactS3Prefix",
+        "PlanHash.$": "$.Plan.PlanHash",
+        "ChunkS3Uris.$": "$.Chunks[*].ChunkS3Uri",
+        AudioS3Uri: null,
+        "OutputS3Uri.$": "$.OutputS3Uri",
+        "Format.$": "$.Plan.Format",
+      }),
+      resultSelector: {
+        "OutputS3Uri.$": "$.Payload.OutputS3Uri",
+        "FramesEncoded.$": "$.Payload.FramesEncoded",
+        "FileSize.$": "$.Payload.FileSize",
+      },
+      resultPath: "$.Output",
+    });
+    assembleV2.addRetry({ errors: NON_RETRYABLE_ASSEMBLE, maxAttempts: 0 });
+    assembleV2.addRetry({
+      errors: ["States.ALL"],
+      interval: Duration.seconds(2),
+      maxAttempts: 4,
+      backoffRate: 2,
+      maxDelay: Duration.seconds(60),
+    });
+
+    const selectWorkerProtocol = new sfn.Choice(this, "SelectWorkerProtocol")
+      .when(
+        sfn.Condition.stringEquals("$.Plan.PlanProtocol", "v2"),
+        renderChunksV2.next(assembleV2),
+      )
+      .otherwise(renderChunks.next(assemble));
     const assertChunkCount = new sfn.Choice(this, "AssertChunkCount")
-      .when(sfn.Condition.numberGreaterThan("$.Plan.ChunkCount", 0), renderChunks.next(assemble))
+      .when(sfn.Condition.numberGreaterThan("$.Plan.ChunkCount", 0), selectWorkerProtocol)
       .otherwise(planProducedZero);
 
-    return plan.next(buildChunkList).next(assertChunkCount);
+    plan.next(buildChunkList);
+    planV2.next(buildChunkList);
+    buildChunkList.next(assertChunkCount);
+
+    const unsupportedPlanProtocol = new sfn.Fail(this, "UnsupportedPlanProtocol", {
+      error: "PLAN_PROTOCOL_UNSUPPORTED",
+      cause: 'PlanProtocol must be "v1", "v2", or absent (defaults to v1).',
+    });
+    return new sfn.Choice(this, "SelectPlanProtocol")
+      .when(sfn.Condition.stringEquals("$.PlanProtocol", "v2"), planV2)
+      .when(sfn.Condition.stringEquals("$.PlanProtocol", "v1"), plan)
+      .when(sfn.Condition.isPresent("$.PlanProtocol"), unsupportedPlanProtocol)
+      .otherwise(plan);
   }
 }
 
diff --git a/packages/aws-lambda/src/events.ts b/packages/aws-lambda/src/events.ts
index 738ef0188..e49da1d80 100644
--- a/packages/aws-lambda/src/events.ts
+++ b/packages/aws-lambda/src/events.ts
@@ -25,6 +25,8 @@ export type { SerializableDistributedRenderConfig } from "@hyperframes/producer/
 
 /** Discriminator for the three roles the one Lambda image fulfills. */
 export type LambdaAction = "plan" | "renderChunk" | "assemble";
+/** Transport protocol selected for one complete distributed render. */
+export type LambdaPlanProtocol = "v1" | "v2";
 
 /**
  * Top-level shape of any event the handler may receive.
@@ -42,7 +44,7 @@ export type LambdaEvent =
   | { Input: LambdaEvent };
 
 /** Activity A: produce a planDir, upload to S3. */
-export interface PlanEvent {
+interface PlanEventBase {
   Action: "plan";
   /** S3 URI pointing at a `tar -czf`-archived project directory (`s3://bucket/key.tar.gz`). */
   ProjectS3Uri: string;
@@ -52,17 +54,27 @@ export interface PlanEvent {
   Config: SerializableDistributedRenderConfig;
 }
 
+/** Legacy/default plan transport. Absence is deliberately interpreted as v1. */
+export interface PlanV1Event extends PlanEventBase {
+  PlanProtocol?: "v1";
+}
+
+/** Explicit opt-in to the content-addressed v2 plan transport. */
+export interface PlanV2Event extends PlanEventBase {
+  PlanProtocol: "v2";
+}
+
+export type PlanEvent = PlanV1Event | PlanV2Event;
+
 /** Activity B: fetch planDir, render one chunk, upload result. */
-export interface RenderChunkEvent {
+interface RenderChunkEventBase {
   Action: "renderChunk";
-  /** S3 URI of the plan tar produced by a PlanEvent invocation. */
-  PlanS3Uri: string;
   /**
-   * `PlanResult.planHash` from the Plan invocation. The handler verifies
-   * this against the untarred planDir's `plan.json` before invoking the
-   * producer, throwing a typed `PLAN_HASH_MISMATCH` on divergence so the
-   * state machine routes it as non-retryable. Defense-in-depth — the
-   * producer also re-checks internally.
+   * `PlanResult.planHash` from the Plan invocation. For v1, the handler
+   * verifies it against the untarred planDir's `plan.json`; for v2, it
+   * verifies it against the content-addressed manifest before invoking the
+   * producer. Divergence throws a typed `PLAN_HASH_MISMATCH` so the state
+   * machine routes it as non-retryable.
    */
   PlanHash: string;
   /** 0-based chunk index this invocation should render. */
@@ -73,11 +85,28 @@ export interface RenderChunkEvent {
   Format: DistributedFormat;
 }
 
-/** Activity C: fetch planDir + all chunks + audio, assemble, upload final. */
-export interface AssembleEvent {
-  Action: "assemble";
-  /** S3 URI of the plan tar produced by a PlanEvent invocation. */
+/** Legacy/default chunk event. */
+export interface RenderChunkV1Event extends RenderChunkEventBase {
+  PlanProtocol?: "v1";
+  /** S3 URI of the v1 plan tar produced by a PlanEvent invocation. */
   PlanS3Uri: string;
+}
+
+/**
+ * V2 chunk event. It intentionally cannot carry `PlanS3Uri`: the manifest
+ * describes the exact content-addressed artifacts needed by this chunk.
+ */
+export interface RenderChunkV2Event extends RenderChunkEventBase {
+  PlanProtocol: "v2";
+  PlanV2ManifestS3Uri: string;
+  PlanV2ArtifactS3Prefix: string;
+}
+
+export type RenderChunkEvent = RenderChunkV1Event | RenderChunkV2Event;
+
+/** Activity C: fetch planDir + all chunks + audio, assemble, upload final. */
+interface AssembleEventBase {
+  Action: "assemble";
   /** S3 URIs of every chunk, ordered by chunk index. Length must equal `chunkCount`. */
   ChunkS3Uris: string[];
   /** S3 URI of the planDir's `audio.aac` if the composition has audio; `null` otherwise. */
@@ -98,12 +127,28 @@ export interface AssembleEvent {
   Cfr?: boolean;
 }
 
+/** Legacy/default assemble event. */
+export interface AssembleV1Event extends AssembleEventBase {
+  PlanProtocol?: "v1";
+  /** S3 URI of the v1 plan tar produced by a PlanEvent invocation. */
+  PlanS3Uri: string;
+}
+
+/** V2 assemble event, scoped to manifest-declared assembler artifacts. */
+export interface AssembleV2Event extends AssembleEventBase {
+  PlanProtocol: "v2";
+  PlanV2ManifestS3Uri: string;
+  PlanV2ArtifactS3Prefix: string;
+  PlanHash: string;
+}
+
+export type AssembleEvent = AssembleV1Event | AssembleV2Event;
+
 // ── Result types — kept small to fit Step Functions history budgets ─────────
 
 /** Result of a `plan` invocation. Carries enough to size the Map(N) state. */
-export interface PlanLambdaResult {
+interface PlanLambdaResultBase {
   Action: "plan";
-  PlanS3Uri: string;
   PlanHash: string;
   ChunkCount: number;
   TotalFrames: number;
@@ -118,6 +163,20 @@ export interface PlanLambdaResult {
   DurationMs: number;
 }
 
+/** Existing v1 result. Kept unchanged for wire compatibility. */
+export interface PlanV1LambdaResult extends PlanLambdaResultBase {
+  PlanS3Uri: string;
+}
+
+/** V2 result. The two v2 locators are never aliases for `PlanS3Uri`. */
+export interface PlanV2LambdaResult extends PlanLambdaResultBase {
+  PlanProtocol: "v2";
+  PlanV2ManifestS3Uri: string;
+  PlanV2ArtifactS3Prefix: string;
+}
+
+export type PlanLambdaResult = PlanV1LambdaResult | PlanV2LambdaResult;
+
 /** Result of a `renderChunk` invocation. Sized ≤200 bytes per §2.4. */
 export interface RenderChunkLambdaResult {
   Action: "renderChunk";
diff --git a/packages/aws-lambda/src/handler.test.ts b/packages/aws-lambda/src/handler.test.ts
index c3d13ee73..f67314eb3 100644
--- a/packages/aws-lambda/src/handler.test.ts
+++ b/packages/aws-lambda/src/handler.test.ts
@@ -15,15 +15,19 @@
  */
 
 import { afterEach, beforeEach, describe, expect, it, mock } from "bun:test";
-import { mkdirSync, mkdtempSync, rmSync, writeFileSync } from "node:fs";
+import { createHash } from "node:crypto";
+import { existsSync, mkdirSync, mkdtempSync, readFileSync, rmSync, writeFileSync } from "node:fs";
 import { tmpdir } from "node:os";
 import { join } from "node:path";
 import {
   CURRENT_PLAN_PROTOCOL,
+  createPlanV2FromV1,
   type AssembleResult,
   type ChunkResult,
   type PlanResult,
+  type PlanV2Result,
 } from "@hyperframes/producer/distributed";
+import { recomputePlanHashFromPlanDir } from "../../producer/src/services/render/stages/freezePlan.js";
 import type { AssembleEvent, LambdaEvent, PlanEvent, RenderChunkEvent } from "./events.js";
 import { handler, unwrapEvent } from "./handler.js";
 
@@ -42,9 +46,13 @@ class FakeS3Client {
   ops: FakeS3Op[] = [];
   // Map S3 URIs → byte buffers the fake serves.
   objects = new Map<string, Buffer>();
+  metadata = new Map<string, Record<string, string>>();
 
   // Methods called by the real S3 transport — minimal surface so the
   // handler's call sites don't need rewriting under test.
+  // This fake intentionally implements the complete S3 command matrix inline so
+  // handler tests exercise realistic state transitions without AWS.
+  // fallow-ignore-next-line complexity
   async send(command: unknown): Promise<unknown> {
     const op = command as { input: { Bucket: string; Key: string } } & {
       constructor: { name: string };
@@ -59,20 +67,38 @@ class FakeS3Client {
       const { Readable } = await import("node:stream");
       return { Body: Readable.from([bytes]) };
     }
+    if (cmdName === "HeadObjectCommand") {
+      const bytes = this.objects.get(uri);
+      if (!bytes) {
+        const error = new Error("not found") as Error & {
+          $metadata: { httpStatusCode: number };
+        };
+        error.name = "NotFound";
+        error.$metadata = { httpStatusCode: 404 };
+        throw error;
+      }
+      return {
+        ContentLength: bytes.length,
+        Metadata: this.metadata.get(uri),
+      };
+    }
     if (cmdName === "PutObjectCommand") {
       // Buffer the body so we can record how many bytes were uploaded; the
       // handler's hot path streams from disk, but tests pin the count.
       const body = (command as { input: { Body: NodeJS.ReadableStream | Buffer } }).input.Body;
-      let bytes = 0;
+      const chunks: Buffer[] = [];
       if (Buffer.isBuffer(body)) {
-        bytes = body.length;
+        chunks.push(body);
       } else if (body && typeof (body as NodeJS.ReadableStream).pipe === "function") {
         for await (const chunk of body as NodeJS.ReadableStream) {
-          bytes += (chunk as Buffer).length;
+          chunks.push(Buffer.from(chunk as Buffer));
         }
       }
-      this.ops.push({ kind: "upload", uri, bytes });
-      this.objects.set(uri, Buffer.alloc(bytes));
+      const bytes = Buffer.concat(chunks);
+      this.ops.push({ kind: "upload", uri, bytes: bytes.length });
+      this.objects.set(uri, bytes);
+      const metadata = (command as { input: { Metadata?: Record<string, string> } }).input.Metadata;
+      if (metadata) this.metadata.set(uri, metadata);
       return {};
     }
     return {};
@@ -215,6 +241,49 @@ describe("handler dispatch", () => {
     ).toBe(true);
   });
 
+  it("normalizes producer terminal codes to Step Functions error names", async () => {
+    for (const code of [
+      "PLAN_TOO_LARGE",
+      "PLAN_PROTOCOL_UNSUPPORTED",
+      "PLAN_V2_INTEGRITY_UNRECOVERABLE",
+    ] as const) {
+      const tmpRoot = makeTmpRoot();
+      const s3 = new FakeS3Client();
+      s3.objects.set("s3://bucket/project.tar.gz", await makeMinimalProjectTar());
+      const terminal = Object.assign(new Error(`terminal: ${code}`), {
+        code,
+        name: "ProducerError",
+      });
+
+      await expect(
+        handler(
+          {
+            Action: "plan",
+            ProjectS3Uri: "s3://bucket/project.tar.gz",
+            PlanOutputS3Prefix: "s3://bucket/renders/terminal/",
+            Config: { fps: 30, width: 640, height: 360, format: "mp4" },
+          },
+          {
+            s3: s3 as unknown as import("@aws-sdk/client-s3").S3Client,
+            primitives: {
+              plan: mock(async () => {
+                throw terminal;
+              }) as unknown as typeof import("@hyperframes/producer/distributed").plan,
+              renderChunk: mock(async () => {
+                throw new Error("unused");
+              }) as unknown as typeof import("@hyperframes/producer/distributed").renderChunk,
+              assemble: mock(async () => {
+                throw new Error("unused");
+              }) as unknown as typeof import("@hyperframes/producer/distributed").assemble,
+            },
+            tmpRoot,
+            skipChromeResolution: true,
+          },
+        ),
+      ).rejects.toMatchObject({ name: code });
+    }
+  });
+
   it("plan honors a pre-set PRODUCER_HEADLESS_SHELL_PATH instead of re-resolving Chrome", async () => {
     // Mirrors the renderChunk env-var guard — when a caller (e.g. SAM-local
     // RIE smoke) seeds the path, handlePlan must not overwrite it.
@@ -454,6 +523,119 @@ describe("handler dispatch", () => {
     expect(assembleMock).toHaveBeenCalledTimes(1);
   });
 
+  it("runs v2 plan → target-scoped chunk → assemble without a PlanS3Uri", async () => {
+    const tmpRoot = makeTmpRoot();
+    const s3 = new FakeS3Client();
+    s3.objects.set("s3://bucket/project.tar.gz", await makeMinimalProjectTar());
+
+    const planV2Mock = mock(
+      async (_projectDir: string, _config: unknown, planV2Dir: string): Promise<PlanV2Result> => {
+        const v1Dir = join(tmpRoot, `v1-${Date.now()}`);
+        makeMinimalV1PlanDir(v1Dir, true);
+        return createPlanV2FromV1(v1Dir, planV2Dir);
+      },
+    );
+    const renderChunkMock = mock(
+      async (planDir: string, _chunkIndex: number, outputPath: string): Promise<ChunkResult> => {
+        expect(existsSync(join(planDir, "audio.aac"))).toBe(false);
+        writeFileSync(outputPath, "V2-CHUNK");
+        return {
+          outputPath,
+          outputKind: "file",
+          framesEncoded: 30,
+          sha256: "b".repeat(64),
+          durationMs: 1,
+          perfPath: `${outputPath}.perf.json`,
+        };
+      },
+    );
+    const assembleMock = mock(
+      async (
+        _planDir: string,
+        _chunks: readonly string[],
+        audioPath: string | null,
+        outputPath: string,
+      ): Promise<AssembleResult> => {
+        expect(audioPath).not.toBeNull();
+        expect(readFileSync(audioPath as string, "utf-8")).toBe("AAC");
+        writeFileSync(outputPath, "V2-OUTPUT");
+        return { outputPath, durationMs: 1, framesEncoded: 30, fileSize: 9 };
+      },
+    );
+    const deps = {
+      s3: s3 as unknown as import("@aws-sdk/client-s3").S3Client,
+      primitives: {
+        plan: mock(async () => {
+          throw new Error("v1 plan should not be called");
+        }) as unknown as typeof import("@hyperframes/producer/distributed").plan,
+        planV2: planV2Mock as unknown as typeof import("@hyperframes/producer/distributed").planV2,
+        renderChunk:
+          renderChunkMock as unknown as typeof import("@hyperframes/producer/distributed").renderChunk,
+        assemble:
+          assembleMock as unknown as typeof import("@hyperframes/producer/distributed").assemble,
+      },
+      tmpRoot,
+      skipChromeResolution: true,
+    };
+
+    const planned = await handler(
+      {
+        Action: "plan",
+        PlanProtocol: "v2",
+        ProjectS3Uri: "s3://bucket/project.tar.gz",
+        PlanOutputS3Prefix: "s3://bucket/renders/v2/",
+        Config: { fps: 30, width: 640, height: 360, format: "mp4" },
+      },
+      deps,
+    );
+    expect(planned).toMatchObject({
+      PlanProtocol: "v2",
+      PlanV2ManifestS3Uri: "s3://bucket/renders/v2/v2/manifest.json",
+      PlanV2ArtifactS3Prefix: "s3://bucket/renders/v2/v2/artifacts/sha256",
+    });
+    expect("PlanS3Uri" in planned).toBe(false);
+    if (!("PlanProtocol" in planned) || planned.PlanProtocol !== "v2") {
+      throw new Error("expected v2 plan result");
+    }
+
+    const beforeChunk = s3.ops.length;
+    const chunk = await handler(
+      {
+        Action: "renderChunk",
+        PlanProtocol: "v2",
+        PlanV2ManifestS3Uri: planned.PlanV2ManifestS3Uri,
+        PlanV2ArtifactS3Prefix: planned.PlanV2ArtifactS3Prefix,
+        PlanHash: planned.PlanHash,
+        ChunkIndex: 0,
+        ChunkOutputS3Prefix: "s3://bucket/renders/v2/",
+        Format: "mp4",
+      },
+      deps,
+    );
+    if (chunk.Action !== "renderChunk") throw new Error("expected chunk result");
+    const audioDigest = createHash("sha256").update("AAC").digest("hex");
+    const audioUri = `${planned.PlanV2ArtifactS3Prefix}/${audioDigest.slice(0, 2)}/${audioDigest}`;
+    expect(s3.ops.slice(beforeChunk).some((operation) => operation.uri === audioUri)).toBe(false);
+
+    await handler(
+      {
+        Action: "assemble",
+        PlanProtocol: "v2",
+        PlanV2ManifestS3Uri: planned.PlanV2ManifestS3Uri,
+        PlanV2ArtifactS3Prefix: planned.PlanV2ArtifactS3Prefix,
+        PlanHash: planned.PlanHash,
+        ChunkS3Uris: [chunk.ChunkS3Uri],
+        AudioS3Uri: null,
+        OutputS3Uri: "s3://bucket/renders/v2/output.mp4",
+        Format: "mp4",
+      },
+      deps,
+    );
+    expect(
+      s3.ops.some((operation) => operation.kind === "download" && operation.uri === audioUri),
+    ).toBe(true);
+  });
+
   it("rejects unknown actions", async () => {
     const tmpRoot = makeTmpRoot();
     await expect(
@@ -575,3 +757,27 @@ async function makeMinimalPlanTar(): Promise<Buffer> {
   await tar.create({ gzip: true, file: tarPath, cwd: dir }, ["plan.json", "meta"]);
   return rf(tarPath);
 }
+
+function makeMinimalV1PlanDir(dir: string, withAudio: boolean): void {
+  mkdirSync(join(dir, "meta"), { recursive: true });
+  mkdirSync(join(dir, "compiled"), { recursive: true });
+  writeFileSync(join(dir, "compiled", "index.html"), "<html>aws v2 fixture</html>");
+  const planJson = {
+    planHash: "a".repeat(64),
+    chunkCount: 1,
+    totalFrames: 30,
+    dimensions: { fpsNum: 30, fpsDen: 1, width: 640, height: 360, format: "mp4" },
+    ffmpegVersion: "6.0",
+    producerVersion: "test",
+    fontSnapshotSha: "font-snapshot-test",
+  };
+  writeFileSync(join(dir, "plan.json"), JSON.stringify(planJson));
+  writeFileSync(
+    join(dir, "meta", "chunks.json"),
+    JSON.stringify([{ index: 0, startFrame: 0, endFrame: 30 }]),
+  );
+  writeFileSync(join(dir, "meta", "encoder.json"), "{}");
+  if (withAudio) writeFileSync(join(dir, "audio.aac"), "AAC");
+  planJson.planHash = recomputePlanHashFromPlanDir(dir);
+  writeFileSync(join(dir, "plan.json"), JSON.stringify(planJson));
+}
diff --git a/packages/aws-lambda/src/handler.ts b/packages/aws-lambda/src/handler.ts
index f5bf8ed6f..62476255d 100644
--- a/packages/aws-lambda/src/handler.ts
+++ b/packages/aws-lambda/src/handler.ts
@@ -20,8 +20,15 @@ import {
   type AssembleResult,
   type ChunkResult,
   type DistributedRenderConfig,
+  listPlanV2ArtifactsForTarget,
+  materializePlanV2Target,
   plan,
+  planV2,
   type PlanResult,
+  type PlanV2Artifact,
+  type PlanV2MaterializationTarget,
+  type PlanV2Result,
+  readPlanV2Manifest,
   renderChunk,
 } from "@hyperframes/producer/distributed";
 import { resolveChromeExecutablePath } from "./chromium.js";
@@ -39,9 +46,12 @@ import type {
 } from "./events.js";
 import {
   downloadS3ObjectToFile,
+  downloadS3ObjectToFileVerified,
   parseS3Uri,
+  sha256File,
   tarDirectory,
   untarDirectory,
+  uploadContentAddressedFileToS3,
   uploadFileToS3,
 } from "./s3Transport.js";
 
@@ -67,6 +77,7 @@ export interface HandlerDeps {
   s3?: S3Client;
   primitives?: {
     plan: typeof plan;
+    planV2?: typeof planV2;
     renderChunk: typeof renderChunk;
     assemble: typeof assemble;
   };
@@ -109,6 +120,7 @@ export async function handler(event: LambdaEvent, deps?: HandlerDeps): Promise<L
       }
     }
   } catch (err) {
+    normalizeTerminalErrorName(err);
     // Log before re-throwing so CloudWatch captures the structured
     // error context alongside Lambda's default stack trace. Otherwise
     // ops only sees the trace and has to correlate with execution
@@ -116,6 +128,7 @@ export async function handler(event: LambdaEvent, deps?: HandlerDeps): Promise<L
     logEvent({
       event: "handler_error",
       action: unwrapped.Action,
+      input: summarizeEvent(unwrapped),
       message: err instanceof Error ? err.message : String(err),
       name: err instanceof Error ? err.name : undefined,
     });
@@ -123,6 +136,25 @@ export async function handler(event: LambdaEvent, deps?: HandlerDeps): Promise<L
   }
 }
 
+/**
+ * AWS Lambda reports `Error.name` to Step Functions, while producer errors
+ * expose stable machine codes separately. Normalize the terminal codes
+ * whose historical class names differ from their orchestration contracts.
+ */
+// The explicit error-name mapping is the public Step Functions failure contract.
+// fallow-ignore-next-line complexity
+function normalizeTerminalErrorName(error: unknown): void {
+  if (!error || typeof error !== "object") return;
+  const candidate = error as { code?: unknown; name?: string };
+  if (
+    candidate.code === "PLAN_PROTOCOL_UNSUPPORTED" ||
+    candidate.code === "PLAN_TOO_LARGE" ||
+    candidate.code === "PLAN_V2_INTEGRITY_UNRECOVERABLE"
+  ) {
+    candidate.name = candidate.code;
+  }
+}
+
 /**
  * Walk through Step Functions' Map-state and Task-state envelopes until
  * the discriminated event is found.
@@ -178,6 +210,8 @@ function logEvent(payload: Record<string, unknown>): void {
  * the routable fields (S3 URIs, chunk index, format) needed to triage
  * a failure from CloudWatch.
  */
+// Keep event variants together so logs share one redaction and summarization boundary.
+// fallow-ignore-next-line complexity
 function summarizeEvent(
   event: PlanEvent | RenderChunkEvent | AssembleEvent,
 ): Record<string, unknown> {
@@ -186,18 +220,25 @@ function summarizeEvent(
       return {
         projectS3Uri: event.ProjectS3Uri,
         planOutputS3Prefix: event.PlanOutputS3Prefix,
+        planProtocol: event.PlanProtocol ?? "v1",
         format: event.Config.format,
         fps: event.Config.fps,
       };
     case "renderChunk":
       return {
-        planS3Uri: event.PlanS3Uri,
+        planProtocol: event.PlanProtocol ?? "v1",
+        ...(event.PlanProtocol === "v2"
+          ? { planV2ManifestS3Uri: event.PlanV2ManifestS3Uri }
+          : { planS3Uri: event.PlanS3Uri }),
         chunkIndex: event.ChunkIndex,
         format: event.Format,
       };
     case "assemble":
       return {
-        planS3Uri: event.PlanS3Uri,
+        planProtocol: event.PlanProtocol ?? "v1",
+        ...(event.PlanProtocol === "v2"
+          ? { planV2ManifestS3Uri: event.PlanV2ManifestS3Uri }
+          : { planS3Uri: event.PlanS3Uri }),
         chunkCount: event.ChunkS3Uris.length,
         hasAudio: event.AudioS3Uri !== null,
         outputS3Uri: event.OutputS3Uri,
@@ -226,6 +267,9 @@ function primeRuntimeEnv(): void {
 // ── Plan ────────────────────────────────────────────────────────────────────
 
 async function handlePlan(event: PlanEvent, deps?: HandlerDeps): Promise<PlanLambdaResult> {
+  if (event.PlanProtocol === "v2") {
+    return handlePlanV2(event, deps);
+  }
   const started = Date.now();
   const s3 = deps?.s3 ?? getS3Client();
   const primitive = deps?.primitives?.plan ?? plan;
@@ -297,12 +341,90 @@ async function handlePlan(event: PlanEvent, deps?: HandlerDeps): Promise<PlanLam
   }
 }
 
+// Plan v2 orchestration is kept as one transactional boundary: stage, CAS upload,
+// and manifest-last publication must stay ordered and fail together.
+// fallow-ignore-next-line complexity
+async function handlePlanV2(
+  event: Extract<PlanEvent, { PlanProtocol: "v2" }>,
+  deps?: HandlerDeps,
+): Promise<Extract<PlanLambdaResult, { PlanProtocol: "v2" }>> {
+  const started = Date.now();
+  const s3 = deps?.s3 ?? getS3Client();
+  const primitive = deps?.primitives?.planV2 ?? planV2;
+  if (!deps?.skipChromeResolution && !process.env.PRODUCER_HEADLESS_SHELL_PATH) {
+    process.env.PRODUCER_HEADLESS_SHELL_PATH = await resolveChromeExecutablePath();
+  }
+
+  const work = mkdtempSync(join(deps?.tmpRoot ?? tmpdir(), "hf-lambda-plan-v2-"));
+  const projectArchive = join(work, "project.tar.gz");
+  const projectDir = join(work, "project");
+  const planV2Dir = join(work, "plan-v2");
+  try {
+    await downloadS3ObjectToFile(s3, event.ProjectS3Uri, projectArchive);
+    await untarDirectory(projectArchive, projectDir);
+    const result: PlanV2Result = await primitive(projectDir, { ...event.Config }, planV2Dir);
+    const manifest = readPlanV2Manifest(planV2Dir);
+    if (manifest.planHash !== result.planHash) {
+      throwPlanHashMismatch(result.planHash, manifest.planHash);
+    }
+
+    const outputPrefix = `${trimTrailingSlash(event.PlanOutputS3Prefix)}/v2`;
+    const artifactPrefix = `${outputPrefix}/artifacts/sha256`;
+    const uniqueArtifacts = [
+      ...new Map(manifest.artifacts.map((artifact) => [artifact.sha256, artifact])).values(),
+    ];
+    await mapConcurrent(uniqueArtifacts, 16, async (artifact) => {
+      const localPath = planV2BlobPath(planV2Dir, artifact.sha256);
+      await uploadContentAddressedFileToS3(
+        s3,
+        localPath,
+        planV2BlobUri(artifactPrefix, artifact.sha256),
+        artifact.sha256,
+      );
+    });
+
+    // Publish the manifest only after every referenced blob is durable.
+    const manifestUri = `${outputPrefix}/manifest.json`;
+    await uploadContentAddressedFileToS3(
+      s3,
+      result.manifestPath,
+      manifestUri,
+      await sha256File(result.manifestPath),
+      "application/json",
+    );
+
+    return {
+      Action: "plan",
+      PlanProtocol: "v2",
+      PlanV2ManifestS3Uri: manifestUri,
+      PlanV2ArtifactS3Prefix: artifactPrefix,
+      PlanHash: result.planHash,
+      ChunkCount: result.chunkCount,
+      TotalFrames: result.totalFrames,
+      Fps: result.fps,
+      Width: result.width,
+      Height: result.height,
+      Format: result.format,
+      HasAudio: manifest.artifacts.some((artifact) => artifact.path === "audio.aac"),
+      AudioS3Uri: null,
+      FfmpegVersion: result.ffmpegVersion,
+      ProducerVersion: result.producerVersion,
+      DurationMs: Date.now() - started,
+    };
+  } finally {
+    cleanupDir(work);
+  }
+}
+
 // ── RenderChunk ─────────────────────────────────────────────────────────────
 
 async function handleRenderChunk(
   event: RenderChunkEvent,
   deps?: HandlerDeps,
 ): Promise<RenderChunkLambdaResult> {
+  if (event.PlanProtocol === "v2") {
+    return handleRenderChunkV2(event, deps);
+  }
   const started = Date.now();
   const s3 = deps?.s3 ?? getS3Client();
   const primitive = deps?.primitives?.renderChunk ?? renderChunk;
@@ -364,6 +486,53 @@ async function handleRenderChunk(
   }
 }
 
+// The v2 chunk handler deliberately keeps download, verified materialization,
+// render, and upload in one lifecycle so cleanup and errors remain atomic.
+// fallow-ignore-next-line complexity
+async function handleRenderChunkV2(
+  event: Extract<RenderChunkEvent, { PlanProtocol: "v2" }>,
+  deps?: HandlerDeps,
+): Promise<RenderChunkLambdaResult> {
+  const started = Date.now();
+  const s3 = deps?.s3 ?? getS3Client();
+  const primitive = deps?.primitives?.renderChunk ?? renderChunk;
+  if (!deps?.skipChromeResolution && !process.env.PRODUCER_HEADLESS_SHELL_PATH) {
+    process.env.PRODUCER_HEADLESS_SHELL_PATH = await resolveChromeExecutablePath();
+  }
+  const work = mkdtempSync(join(deps?.tmpRoot ?? tmpdir(), "hf-lambda-chunk-v2-"));
+  try {
+    const planDir = await downloadAndMaterializePlanV2(
+      s3,
+      event,
+      { role: "chunk", chunkIndex: event.ChunkIndex },
+      work,
+    );
+    const chunkOutputBase = join(
+      work,
+      event.Format === "png-sequence"
+        ? `chunk-${pad(event.ChunkIndex)}`
+        : `chunk-${pad(event.ChunkIndex)}${formatExtension(event.Format)}`,
+    );
+    const result = await primitive(planDir, event.ChunkIndex, chunkOutputBase);
+    const chunkUri = await uploadChunkOutput(
+      s3,
+      result,
+      event.ChunkOutputS3Prefix,
+      event.ChunkIndex,
+    );
+    return {
+      Action: "renderChunk",
+      ChunkS3Uri: chunkUri,
+      ChunkIndex: event.ChunkIndex,
+      Sha256: result.sha256,
+      FramesEncoded: result.framesEncoded,
+      DurationMs: Date.now() - started,
+    };
+  } finally {
+    cleanupDir(work);
+  }
+}
+
 async function uploadChunkOutput(
   s3: S3Client,
   result: ChunkResult,
@@ -393,6 +562,9 @@ async function handleAssemble(
   event: AssembleEvent,
   deps?: HandlerDeps,
 ): Promise<AssembleLambdaResult> {
+  if (event.PlanProtocol === "v2") {
+    return handleAssembleV2(event, deps);
+  }
   const started = Date.now();
   const s3 = deps?.s3 ?? getS3Client();
   const primitive = deps?.primitives?.assemble ?? assemble;
@@ -442,6 +614,123 @@ async function handleAssemble(
   }
 }
 
+// Assembly mirrors the chunk lifecycle while adding assembler-only artifacts;
+// keeping the steps local makes its temporary-storage ownership explicit.
+// fallow-ignore-next-line complexity
+async function handleAssembleV2(
+  event: Extract<AssembleEvent, { PlanProtocol: "v2" }>,
+  deps?: HandlerDeps,
+): Promise<AssembleLambdaResult> {
+  const started = Date.now();
+  const s3 = deps?.s3 ?? getS3Client();
+  const primitive = deps?.primitives?.assemble ?? assemble;
+  const work = mkdtempSync(join(deps?.tmpRoot ?? tmpdir(), "hf-lambda-assemble-v2-"));
+  try {
+    const planDir = await downloadAndMaterializePlanV2(s3, event, { role: "assembler" }, work);
+    // `downloadAndMaterializePlanV2` materializes atomically. Audio is
+    // assembler-only and lives at the familiar v1-compatible location.
+    const audioPath = existsSync(join(planDir, "audio.aac")) ? join(planDir, "audio.aac") : null;
+    const chunkPaths = await downloadChunkObjects(s3, event.ChunkS3Uris, work, event.Format);
+    const finalOutput =
+      event.Format === "png-sequence"
+        ? join(work, "output-frames")
+        : join(work, `output${formatExtension(event.Format)}`);
+    const result = await primitive(planDir, chunkPaths, audioPath, finalOutput, {
+      cfr: event.Cfr === true,
+    });
+    if (event.Format === "png-sequence") {
+      const tarball = `${finalOutput}.tar.gz`;
+      await tarDirectory(finalOutput, tarball);
+      await uploadFileToS3(s3, tarball, event.OutputS3Uri, "application/gzip");
+    } else {
+      await uploadFileToS3(s3, finalOutput, event.OutputS3Uri);
+    }
+    return {
+      Action: "assemble",
+      OutputS3Uri: event.OutputS3Uri,
+      FramesEncoded: result.framesEncoded,
+      FileSize: result.fileSize,
+      DurationMs: Date.now() - started,
+    };
+  } finally {
+    cleanupDir(work);
+  }
+}
+
+async function downloadAndMaterializePlanV2(
+  s3: S3Client,
+  event: {
+    PlanV2ManifestS3Uri: string;
+    PlanV2ArtifactS3Prefix: string;
+    PlanHash: string;
+  },
+  target: PlanV2MaterializationTarget,
+  work: string,
+): Promise<string> {
+  const transportDir = join(work, "plan-v2");
+  mkdirSync(transportDir, { recursive: true });
+  await downloadS3ObjectToFile(s3, event.PlanV2ManifestS3Uri, join(transportDir, "plan.json"));
+  const manifest = readPlanV2Manifest(transportDir);
+  if (manifest.planHash !== event.PlanHash) {
+    throwPlanHashMismatch(event.PlanHash, manifest.planHash);
+  }
+  const artifacts = listPlanV2ArtifactsForTarget(manifest, target);
+  const uniqueArtifacts = [
+    ...new Map(artifacts.map((artifact) => [artifact.sha256, artifact])).values(),
+  ];
+  await mapConcurrent(uniqueArtifacts, 16, async (artifact) => {
+    await downloadPlanV2Artifact(s3, event.PlanV2ArtifactS3Prefix, transportDir, artifact);
+  });
+  const planDir = join(work, "plan");
+  materializePlanV2Target(transportDir, target, planDir);
+  return planDir;
+}
+
+async function downloadPlanV2Artifact(
+  s3: S3Client,
+  artifactPrefix: string,
+  planV2Dir: string,
+  artifact: Readonly<PlanV2Artifact>,
+): Promise<void> {
+  await downloadS3ObjectToFileVerified(
+    s3,
+    planV2BlobUri(artifactPrefix, artifact.sha256),
+    planV2BlobPath(planV2Dir, artifact.sha256),
+    artifact.sha256,
+  );
+}
+
+function planV2BlobPath(planV2Dir: string, digest: string): string {
+  return join(planV2Dir, "artifacts", "sha256", digest.slice(0, 2), digest);
+}
+
+function planV2BlobUri(prefix: string, digest: string): string {
+  return `${trimTrailingSlash(prefix)}/${digest.slice(0, 2)}/${digest}`;
+}
+
+function throwPlanHashMismatch(expected: string, actual: string): never {
+  const error = new Error(
+    `PLAN_HASH_MISMATCH: event PlanHash=${expected} did not match v2 manifest planHash=${actual}`,
+  );
+  error.name = "PLAN_HASH_MISMATCH";
+  throw error;
+}
+
+async function mapConcurrent<T>(
+  values: readonly T[],
+  concurrency: number,
+  fn: (value: T) => Promise<void>,
+): Promise<void> {
+  let cursor = 0;
+  async function worker(): Promise<void> {
+    while (cursor < values.length) {
+      const index = cursor++;
+      await fn(values[index]!);
+    }
+  }
+  await Promise.all(Array.from({ length: Math.min(concurrency, values.length) }, () => worker()));
+}
+
 async function downloadChunkObjects(
   s3: S3Client,
   uris: string[],
@@ -479,16 +768,25 @@ async function downloadChunkObjects(
 // ── Helpers ─────────────────────────────────────────────────────────────────
 
 /** Collect every S3 URI that the handler will touch for a given event. */
+// This is an exhaustive event-union projection used only for safe log summaries.
+// fallow-ignore-next-line complexity
 function getEventS3Uris(event: PlanEvent | RenderChunkEvent | AssembleEvent): string[] {
   switch (event.Action) {
     case "plan":
       return [event.ProjectS3Uri, event.PlanOutputS3Prefix];
     case "renderChunk":
-      return [event.PlanS3Uri, event.ChunkOutputS3Prefix];
+      return event.PlanProtocol === "v2"
+        ? [event.PlanV2ManifestS3Uri, event.PlanV2ArtifactS3Prefix, event.ChunkOutputS3Prefix]
+        : [event.PlanS3Uri, event.ChunkOutputS3Prefix];
     case "assemble":
-      return [event.PlanS3Uri, ...event.ChunkS3Uris, event.OutputS3Uri, event.AudioS3Uri].filter(
-        (u): u is string => u != null,
-      );
+      return [
+        ...(event.PlanProtocol === "v2"
+          ? [event.PlanV2ManifestS3Uri, event.PlanV2ArtifactS3Prefix]
+          : [event.PlanS3Uri]),
+        ...event.ChunkS3Uris,
+        event.OutputS3Uri,
+        event.AudioS3Uri,
+      ].filter((u): u is string => u != null);
   }
 }
 
diff --git a/packages/aws-lambda/src/index.ts b/packages/aws-lambda/src/index.ts
index eba39a530..eb035249d 100644
--- a/packages/aws-lambda/src/index.ts
+++ b/packages/aws-lambda/src/index.ts
@@ -28,11 +28,20 @@ export {
   type AssembleLambdaResult,
   type LambdaAction,
   type LambdaEvent,
+  type LambdaPlanProtocol,
   type LambdaResult,
   type PlanEvent,
   type PlanLambdaResult,
+  type PlanV1Event,
+  type PlanV1LambdaResult,
+  type PlanV2Event,
+  type PlanV2LambdaResult,
   type RenderChunkEvent,
   type RenderChunkLambdaResult,
+  type RenderChunkV1Event,
+  type RenderChunkV2Event,
+  type AssembleV1Event,
+  type AssembleV2Event,
   type SerializableDistributedRenderConfig,
 } from "./events.js";
 // `_setSparticuzChromiumForTests` is intentionally NOT re-exported from
@@ -47,11 +56,13 @@ export {
 } from "./chromium.js";
 export {
   downloadS3ObjectToFile,
+  downloadS3ObjectToFileVerified,
   formatS3Uri,
   parseS3Uri,
   type S3Location,
   tarDirectory,
   untarDirectory,
+  uploadContentAddressedFileToS3,
   uploadFileToS3,
 } from "./s3Transport.js";
 
diff --git a/packages/aws-lambda/src/s3Transport.test.ts b/packages/aws-lambda/src/s3Transport.test.ts
index dcaa9c549..ea03aea09 100644
--- a/packages/aws-lambda/src/s3Transport.test.ts
+++ b/packages/aws-lambda/src/s3Transport.test.ts
@@ -8,7 +8,15 @@ import { afterAll, beforeAll, describe, expect, it } from "bun:test";
 import { mkdtempSync, readFileSync, rmSync, writeFileSync } from "node:fs";
 import { tmpdir } from "node:os";
 import { join } from "node:path";
-import { formatS3Uri, parseS3Uri, tarDirectory, untarDirectory } from "./s3Transport.js";
+import {
+  downloadS3ObjectToFileVerified,
+  formatS3Uri,
+  parseS3Uri,
+  sha256File,
+  tarDirectory,
+  untarDirectory,
+  uploadContentAddressedFileToS3,
+} from "./s3Transport.js";
 
 let scratchRoot: string;
 
@@ -91,3 +99,110 @@ describe("tar round-trip", () => {
     expect(existsSync(join(destDir, "stale.txt"))).toBe(false);
   });
 });
+
+describe("content-addressed v2 artifacts", () => {
+  it("uploads once and reuses an object with matching digest metadata", async () => {
+    const source = join(scratchRoot, "artifact-upload.bin");
+    writeFileSync(source, "immutable bytes");
+    const digest = await sha256File(source);
+    const s3 = new ContentAddressedFakeS3();
+    const uri = `s3://bucket/v2/artifacts/sha256/${digest.slice(0, 2)}/${digest}`;
+
+    expect(await uploadContentAddressedFileToS3(s3.asClient(), source, uri, digest)).toBe(
+      "uploaded",
+    );
+    expect(await uploadContentAddressedFileToS3(s3.asClient(), source, uri, digest)).toBe("reused");
+    expect(s3.putCount).toBe(1);
+  });
+
+  it("refuses to overwrite an immutable key with conflicting metadata", async () => {
+    const source = join(scratchRoot, "artifact-conflict.bin");
+    writeFileSync(source, "expected bytes");
+    const digest = await sha256File(source);
+    const uri = `s3://bucket/v2/artifacts/sha256/${digest.slice(0, 2)}/${digest}`;
+    const s3 = new ContentAddressedFakeS3();
+    s3.objects.set(uri, {
+      bytes: Buffer.from("same length!!"),
+      sha256: "0".repeat(64),
+    });
+
+    await expect(
+      uploadContentAddressedFileToS3(s3.asClient(), source, uri, digest),
+    ).rejects.toMatchObject({ name: "PLAN_ARTIFACT_DIGEST_MISMATCH" });
+    expect(s3.putCount).toBe(0);
+  });
+
+  it("deletes a downloaded artifact when digest verification fails", async () => {
+    const expectedSource = join(scratchRoot, "artifact-expected.bin");
+    const destination = join(scratchRoot, "artifact-download.bin");
+    writeFileSync(expectedSource, "expected");
+    const expected = await sha256File(expectedSource);
+    const uri = "s3://bucket/v2/artifacts/corrupt";
+    const s3 = new ContentAddressedFakeS3();
+    s3.objects.set(uri, { bytes: Buffer.from("corrupt"), sha256: "f".repeat(64) });
+
+    await expect(
+      downloadS3ObjectToFileVerified(s3.asClient(), uri, destination, expected),
+    ).rejects.toMatchObject({ name: "PLAN_ARTIFACT_DIGEST_MISMATCH" });
+    const { existsSync } = await import("node:fs");
+    expect(existsSync(destination)).toBe(false);
+  });
+});
+
+class ContentAddressedFakeS3 {
+  readonly objects = new Map<string, { bytes: Buffer; sha256: string }>();
+  putCount = 0;
+
+  asClient(): import("@aws-sdk/client-s3").S3Client {
+    return this as unknown as import("@aws-sdk/client-s3").S3Client;
+  }
+
+  // This fake intentionally keeps the S3 command matrix in one stateful boundary;
+  // splitting commands across helpers would obscure the transport test behavior.
+  // fallow-ignore-next-line complexity
+  async send(command: unknown): Promise<unknown> {
+    const value = command as {
+      constructor: { name: string };
+      input: {
+        Bucket: string;
+        Key: string;
+        Body?: NodeJS.ReadableStream;
+        Metadata?: Record<string, string>;
+      };
+    };
+    const uri = `s3://${value.input.Bucket}/${value.input.Key}`;
+    if (value.constructor.name === "HeadObjectCommand") {
+      const object = this.objects.get(uri);
+      if (!object) {
+        const error = new Error("not found") as Error & {
+          $metadata: { httpStatusCode: number };
+        };
+        error.name = "NotFound";
+        error.$metadata = { httpStatusCode: 404 };
+        throw error;
+      }
+      return {
+        ContentLength: object.bytes.length,
+        Metadata: { sha256: object.sha256 },
+      };
+    }
+    if (value.constructor.name === "GetObjectCommand") {
+      const object = this.objects.get(uri);
+      if (!object) throw new Error("missing fake object");
+      const { Readable } = await import("node:stream");
+      return { Body: Readable.from([object.bytes]) };
+    }
+    if (value.constructor.name === "PutObjectCommand") {
+      const chunks: Buffer[] = [];
+      for await (const chunk of value.input.Body ?? []) chunks.push(Buffer.from(chunk));
+      const bytes = Buffer.concat(chunks);
+      this.objects.set(uri, {
+        bytes,
+        sha256: value.input.Metadata?.sha256 ?? "",
+      });
+      this.putCount += 1;
+      return {};
+    }
+    throw new Error(`unexpected command ${value.constructor.name}`);
+  }
+}
diff --git a/packages/aws-lambda/src/s3Transport.ts b/packages/aws-lambda/src/s3Transport.ts
index 0c74d378f..becfe3828 100644
--- a/packages/aws-lambda/src/s3Transport.ts
+++ b/packages/aws-lambda/src/s3Transport.ts
@@ -25,9 +25,15 @@ import {
   rmSync,
   statSync,
 } from "node:fs";
+import { createHash } from "node:crypto";
 import { dirname } from "node:path";
 import { pipeline } from "node:stream/promises";
-import { GetObjectCommand, PutObjectCommand, type S3Client } from "@aws-sdk/client-s3";
+import {
+  GetObjectCommand,
+  HeadObjectCommand,
+  PutObjectCommand,
+  type S3Client,
+} from "@aws-sdk/client-s3";
 import * as tar from "tar";
 
 /** Parsed `s3://bucket/key` URI. */
@@ -75,6 +81,26 @@ export async function downloadS3ObjectToFile(
   await pipeline(body, createWriteStream(destPath));
 }
 
+/** Download and verify an immutable plan-v2 artifact before materialization. */
+export async function downloadS3ObjectToFileVerified(
+  client: S3Client,
+  uri: string,
+  destPath: string,
+  expectedSha256: string,
+): Promise<void> {
+  assertSha256(expectedSha256);
+  await downloadS3ObjectToFile(client, uri, destPath);
+  const actual = await sha256File(destPath);
+  if (actual !== expectedSha256) {
+    rmSync(destPath, { force: true });
+    const error = new Error(
+      `[s3Transport] PLAN_ARTIFACT_DIGEST_MISMATCH: ${uri} expected ${expectedSha256}, got ${actual}`,
+    );
+    error.name = "PLAN_ARTIFACT_DIGEST_MISMATCH";
+    throw error;
+  }
+}
+
 /**
  * Upload a local file's contents to an S3 URI using a streaming
  * `PutObjectCommand`. PutObject's 5 GB cap comfortably exceeds the
@@ -104,6 +130,94 @@ export async function uploadFileToS3(
   );
 }
 
+/**
+ * Upload one content-addressed plan-v2 artifact exactly once.
+ *
+ * Existing objects are reused only when their immutable digest metadata and
+ * byte length agree. A conflicting object is never overwritten: doing so
+ * could change a plan already being consumed by another chunk invocation.
+ */
+export async function uploadContentAddressedFileToS3(
+  client: S3Client,
+  localPath: string,
+  uri: string,
+  expectedSha256: string,
+  contentType?: string,
+): Promise<"uploaded" | "reused"> {
+  assertSha256(expectedSha256);
+  if (!existsSync(localPath)) {
+    throw new Error(`[s3Transport] upload source missing: ${localPath}`);
+  }
+  const actualSha256 = await sha256File(localPath);
+  if (actualSha256 !== expectedSha256) {
+    const error = new Error(
+      `[s3Transport] PLAN_ARTIFACT_DIGEST_MISMATCH: local artifact ${localPath} expected ${expectedSha256}, got ${actualSha256}`,
+    );
+    error.name = "PLAN_ARTIFACT_DIGEST_MISMATCH";
+    throw error;
+  }
+
+  const { bucket, key } = parseS3Uri(uri);
+  const size = statSync(localPath).size;
+  try {
+    const existing = await client.send(
+      new HeadObjectCommand({ Bucket: bucket, Key: key, ChecksumMode: "ENABLED" }),
+    );
+    if (existing.ContentLength === size && existing.Metadata?.sha256 === expectedSha256) {
+      return "reused";
+    }
+    const error = new Error(
+      `[s3Transport] PLAN_ARTIFACT_DIGEST_MISMATCH: immutable object ${uri} already exists with different digest metadata or size`,
+    );
+    error.name = "PLAN_ARTIFACT_DIGEST_MISMATCH";
+    throw error;
+  } catch (error) {
+    if (!isS3NotFound(error)) throw error;
+  }
+
+  await client.send(
+    new PutObjectCommand({
+      Bucket: bucket,
+      Key: key,
+      Body: createReadStream(localPath),
+      ContentType: contentType,
+      ContentLength: size,
+      Metadata: { sha256: expectedSha256 },
+      ChecksumSHA256: Buffer.from(expectedSha256, "hex").toString("base64"),
+    }),
+  );
+  return "uploaded";
+}
+
+export async function sha256File(path: string): Promise<string> {
+  const hash = createHash("sha256");
+  for await (const chunk of createReadStream(path)) {
+    hash.update(chunk as Buffer);
+  }
+  return hash.digest("hex");
+}
+
+function assertSha256(value: string): void {
+  if (!/^[a-f0-9]{64}$/.test(value)) {
+    throw new Error(
+      `[s3Transport] expected lowercase SHA-256 digest, got ${JSON.stringify(value)}`,
+    );
+  }
+}
+
+function isS3NotFound(error: unknown): boolean {
+  if (!error || typeof error !== "object") return false;
+  const candidate = error as {
+    name?: string;
+    $metadata?: { httpStatusCode?: number };
+  };
+  return (
+    candidate.name === "NotFound" ||
+    candidate.name === "NoSuchKey" ||
+    candidate.$metadata?.httpStatusCode === 404
+  );
+}
+
 /**
  * Pack a directory into a `.tar.gz` at `destTarball`. Uses the `tar` npm
  * package (pure JS over `node:zlib`) rather than spawning a system tar
diff --git a/packages/aws-lambda/src/sdk/getRenderProgress.test.ts b/packages/aws-lambda/src/sdk/getRenderProgress.test.ts
index fd572c88f..7f0982511 100644
--- a/packages/aws-lambda/src/sdk/getRenderProgress.test.ts
+++ b/packages/aws-lambda/src/sdk/getRenderProgress.test.ts
@@ -201,6 +201,30 @@ describe("getRenderProgress", () => {
     expect(progress.endedAt).not.toBeNull();
   });
 
+  it("recognizes v2 chunk and assemble state names", async () => {
+    const sfn = new FakeSFN();
+    sfn.historyPages = [
+      [
+        stateEntered("PlanV2"),
+        lambdaSucceeded({ Action: "plan", TotalFrames: 30 }),
+        stateEntered("RenderChunkV2"),
+        lambdaSucceeded({ Action: "renderChunk", FramesEncoded: 30 }),
+        stateEntered("AssembleV2"),
+        lambdaSucceeded({ Action: "assemble", FramesEncoded: 30 }),
+        stateExited("AssembleV2", {
+          Output: { OutputS3Uri: "s3://b/v2.mp4", FileSize: 321 },
+        }),
+      ],
+    ];
+    const progress = await getRenderProgress({
+      executionArn: "arn",
+      sfn: sfn as unknown as SFNClient,
+    });
+    expect(progress.framesRendered).toBe(30);
+    expect(progress.overallProgress).toBe(1);
+    expect(progress.outputFile).toEqual({ s3Uri: "s3://b/v2.mp4", bytes: 321 });
+  });
+
   it("computes cost from observed billed duration", async () => {
     const sfn = new FakeSFN();
     sfn.historyPages = [[lambdaSucceeded({ Action: "plan", TotalFrames: 30, DurationMs: 6_000 })]];
diff --git a/packages/aws-lambda/src/sdk/getRenderProgress.ts b/packages/aws-lambda/src/sdk/getRenderProgress.ts
index 9442fc495..6d17736ab 100644
--- a/packages/aws-lambda/src/sdk/getRenderProgress.ts
+++ b/packages/aws-lambda/src/sdk/getRenderProgress.ts
@@ -251,7 +251,7 @@ function summarizeHistory(events: HistoryEvent[], memoryMb: number): HistorySumm
         // ResultSelector pulls FileSize + OutputS3Uri from the Lambda
         // result, so we re-extract them here from the state exit's
         // own output rather than relying on the Lambda payload.
-        if (ev.stateExitedEventDetails?.name === "Assemble") {
+        if (isAssembleState(ev.stateExitedEventDetails?.name)) {
           assembleComplete = true;
           const exitPayload = parseJson(ev.stateExitedEventDetails?.output);
           if (exitPayload && typeof exitPayload === "object") {
@@ -350,12 +350,20 @@ function applyPayloadFrameCounts(
   currentLambdaState: string | null,
   bump: (delta: number) => void,
 ): void {
-  if (currentLambdaState !== "RenderChunk") return;
+  if (!isRenderChunkState(currentLambdaState)) return;
   if (!payload || typeof payload !== "object") return;
   const obj = payload as Record<string, unknown>;
   if (typeof obj.FramesEncoded === "number") bump(obj.FramesEncoded);
 }
 
+function isRenderChunkState(name: string | null | undefined): boolean {
+  return name === "RenderChunk" || name === "RenderChunkV2";
+}
+
+function isAssembleState(name: string | null | undefined): boolean {
+  return name === "Assemble" || name === "AssembleV2";
+}
+
 /**
  * Lambda success payloads from our handler include `DurationMs` — the
  * wall-clock the handler observed. We use it as a best-effort proxy
diff --git a/packages/aws-lambda/src/sdk/renderToLambda.test.ts b/packages/aws-lambda/src/sdk/renderToLambda.test.ts
index 8beb409ec..9410936b9 100644
--- a/packages/aws-lambda/src/sdk/renderToLambda.test.ts
+++ b/packages/aws-lambda/src/sdk/renderToLambda.test.ts
@@ -89,9 +89,27 @@ describe("renderToLambda", () => {
       PlanOutputS3Prefix: "s3://test-bucket/renders/smoke-1/",
       OutputS3Uri: "s3://test-bucket/renders/smoke-1/output.mp4",
       Config: baseConfig,
+      PlanProtocol: "v1",
     });
   });
 
+  it("opts the complete execution into plan protocol v2 explicitly", async () => {
+    const sfn = new FakeSFN();
+    const s3 = new FakeS3();
+    await renderToLambda({
+      projectDir,
+      bucketName: "test-bucket",
+      stateMachineArn: "arn:aws:states:us-east-1:1234:stateMachine:hf",
+      config: baseConfig,
+      executionName: "smoke-v2",
+      planProtocol: "v2",
+      sfn: asSFNClient(sfn),
+      s3: asS3Client(s3),
+    });
+
+    expect(sfn.starts[0]?.input).toMatchObject({ PlanProtocol: "v2" });
+  });
+
   it("derives the file extension from config.format", async () => {
     const sfn = new FakeSFN();
     const s3 = new FakeS3();
diff --git a/packages/aws-lambda/src/sdk/renderToLambda.ts b/packages/aws-lambda/src/sdk/renderToLambda.ts
index 7b96f2e07..5e83482b0 100644
--- a/packages/aws-lambda/src/sdk/renderToLambda.ts
+++ b/packages/aws-lambda/src/sdk/renderToLambda.ts
@@ -20,7 +20,7 @@
 import { randomUUID } from "node:crypto";
 import { SFNClient, StartExecutionCommand } from "@aws-sdk/client-sfn";
 import type { S3Client } from "@aws-sdk/client-s3";
-import type { SerializableDistributedRenderConfig } from "../events.js";
+import type { LambdaPlanProtocol, SerializableDistributedRenderConfig } from "../events.js";
 import { formatExtension } from "../formatExtension.js";
 import { formatS3Uri } from "../s3Transport.js";
 import { deploySite, type SiteHandle } from "./deploySite.js";
@@ -37,6 +37,11 @@ export interface RenderToLambdaOptions {
   siteHandle?: SiteHandle;
   /** Validated `SerializableDistributedRenderConfig` (no logger / abortSignal). */
   config: SerializableDistributedRenderConfig;
+  /**
+   * Distributed plan transport. Defaults to `"v1"` for backwards
+   * compatibility; v2 is always an explicit whole-render opt-in.
+   */
+  planProtocol?: LambdaPlanProtocol;
   /** S3 bucket from the SAM stack output (`RenderBucketName`). */
   bucketName: string;
   /** State machine ARN from the SAM stack output (`RenderStateMachineArn`). */
@@ -110,6 +115,7 @@ export async function renderToLambda(opts: RenderToLambdaOptions): Promise<Rende
     PlanOutputS3Prefix: planOutputS3Prefix,
     OutputS3Uri: outputS3Uri,
     Config: opts.config,
+    PlanProtocol: opts.planProtocol ?? "v1",
   };
 
   // Reject oversize input client-side. Step Functions Standard caps the
diff --git a/packages/producer/fixtures/plan-parity-size-pressure/.plan-parity-fixture.json b/packages/producer/fixtures/plan-parity-size-pressure/.plan-parity-fixture.json
new file mode 100644
index 000000000..84c4f6d89
--- /dev/null
+++ b/packages/producer/fixtures/plan-parity-size-pressure/.plan-parity-fixture.json
@@ -0,0 +1,13 @@
+{
+  "generatedAudio": {
+    "path": "assets/tone.wav",
+    "durationSeconds": 1,
+    "frequencyHz": 330,
+    "sampleRate": 48000
+  },
+  "generatedPressureFile": {
+    "path": "unused-pressure.bin",
+    "bytes": 65536,
+    "seed": 20260725
+  }
+}
diff --git a/packages/producer/fixtures/plan-parity-size-pressure/index.html b/packages/producer/fixtures/plan-parity-size-pressure/index.html
new file mode 100644
index 000000000..16acb402e
--- /dev/null
+++ b/packages/producer/fixtures/plan-parity-size-pressure/index.html
@@ -0,0 +1,49 @@
+<!doctype html>
+<html lang="en">
+  <head>
+    <meta charset="UTF-8" />
+    <meta name="viewport" content="width=320, height=180" />
+    <title>Plan protocol size pressure</title>
+    <style>
+      html,
+      body {
+        width: 320px;
+        height: 180px;
+        margin: 0;
+        overflow: hidden;
+        background: #020617;
+      }
+      .scene {
+        position: absolute;
+        inset: 0;
+        background:
+          radial-gradient(circle at 30% 40%, #22d3ee 0 18px, transparent 19px),
+          radial-gradient(circle at 68% 60%, #f472b6 0 26px, transparent 27px), #0f172a;
+      }
+    </style>
+  </head>
+  <body>
+    <main
+      id="root"
+      data-composition-id="plan-protocol-size-pressure"
+      data-start="0"
+      data-duration="1"
+      data-width="320"
+      data-height="180"
+      data-fps="30"
+      data-no-timeline
+    >
+      <audio
+        id="tone"
+        src="assets/tone.wav"
+        data-start="0"
+        data-duration="1"
+        data-volume="0.5"
+      ></audio>
+      <section class="scene clip" data-start="0" data-duration="1"></section>
+    </main>
+    <script>
+      window.__timelines = window.__timelines || {};
+    </script>
+  </body>
+</html>
diff --git a/packages/producer/fixtures/plan-parity-visual-audio/.plan-parity-fixture.json b/packages/producer/fixtures/plan-parity-visual-audio/.plan-parity-fixture.json
new file mode 100644
index 000000000..4dca04ada
--- /dev/null
+++ b/packages/producer/fixtures/plan-parity-visual-audio/.plan-parity-fixture.json
@@ -0,0 +1,8 @@
+{
+  "generatedAudio": {
+    "path": "assets/tone.wav",
+    "durationSeconds": 2,
+    "frequencyHz": 440,
+    "sampleRate": 48000
+  }
+}
diff --git a/packages/producer/fixtures/plan-parity-visual-audio/index.html b/packages/producer/fixtures/plan-parity-visual-audio/index.html
new file mode 100644
index 000000000..68415de23
--- /dev/null
+++ b/packages/producer/fixtures/plan-parity-visual-audio/index.html
@@ -0,0 +1,78 @@
+<!doctype html>
+<html lang="en">
+  <head>
+    <meta charset="UTF-8" />
+    <meta name="viewport" content="width=320, height=180" />
+    <title>Plan protocol visual and audio parity</title>
+    <style>
+      * {
+        box-sizing: border-box;
+      }
+      html,
+      body {
+        width: 320px;
+        height: 180px;
+        margin: 0;
+        overflow: hidden;
+        background: #07111f;
+      }
+      .scene {
+        position: absolute;
+        inset: 0;
+      }
+      .first {
+        background: linear-gradient(135deg, #07111f, #0e7490);
+      }
+      .second {
+        background: linear-gradient(135deg, #312e81, #be185d);
+      }
+      .shape {
+        position: absolute;
+        width: 72px;
+        height: 72px;
+        border-radius: 18px;
+        background: #f8fafc;
+        box-shadow: 0 12px 30px rgb(0 0 0 / 35%);
+      }
+      .first .shape {
+        top: 38px;
+        left: 48px;
+        transform: rotate(12deg);
+      }
+      .second .shape {
+        right: 48px;
+        bottom: 38px;
+        transform: rotate(-12deg);
+      }
+    </style>
+  </head>
+  <body>
+    <main
+      id="root"
+      data-composition-id="plan-protocol-visual-audio"
+      data-start="0"
+      data-duration="2"
+      data-width="320"
+      data-height="180"
+      data-fps="30"
+      data-no-timeline
+    >
+      <audio
+        id="tone"
+        src="assets/tone.wav"
+        data-start="0"
+        data-duration="2"
+        data-volume="0.5"
+      ></audio>
+      <section class="scene first clip" data-start="0" data-duration="1">
+        <div class="shape"></div>
+      </section>
+      <section class="scene second clip" data-start="1" data-duration="1">
+        <div class="shape"></div>
+      </section>
+    </main>
+    <script>
+      window.__timelines = window.__timelines || {};
+    </script>
+  </body>
+</html>
diff --git a/packages/producer/package.json b/packages/producer/package.json
index a493e8cdd..5ecd684e3 100644
--- a/packages/producer/package.json
+++ b/packages/producer/package.json
@@ -47,6 +47,7 @@
     "build:hf-early-stub": "bun run scripts/build-hf-early-stub.ts",
     "typecheck": "tsc --noEmit",
     "parity:check": "tsx src/parity-harness.ts",
+    "parity:plans": "tsx src/plan-parity-harness.ts",
     "parity:fixtures": "tsx src/parity-fixtures.ts",
     "parity:fixtures:ci": "tsx src/parity-fixtures.ts",
     "parity:check:ci": "tsx src/parity-harness.ts --preview-url \"http://127.0.0.1:4173/minimal-wysiwyg.html\" --producer-url \"http://127.0.0.1:4173/minimal-wysiwyg.html?mode=producer\" --checkpoints \"0,0.5,1,1.5\" --allow-mismatch-ratio 0 --emulate-producer-swap true --artifacts-dir \".debug/parity-harness-ci\"",
diff --git a/packages/producer/src/plan-parity-analysis.test.ts b/packages/producer/src/plan-parity-analysis.test.ts
new file mode 100644
index 000000000..0b3a17f43
--- /dev/null
+++ b/packages/producer/src/plan-parity-analysis.test.ts
@@ -0,0 +1,99 @@
+import { describe, expect, it } from "bun:test";
+import { normalizeFfprobeMetadata, parseCanonicalFrameHashes } from "./plan-parity-analysis.js";
+
+describe("parseCanonicalFrameHashes()", () => {
+  it("returns ordered SHA-256 hashes from ffmpeg framemd5 output", () => {
+    const first = "a".repeat(64);
+    const second = "b".repeat(64);
+    expect(
+      parseCanonicalFrameHashes(
+        [
+          "#format: frame checksums",
+          "#hash: SHA256",
+          `0, 0, 0, 1, 16, ${first}`,
+          `0, 1, 1, 1, 16, ${second}`,
+          "",
+        ].join("\n"),
+      ),
+    ).toEqual([first, second]);
+  });
+
+  it("refuses malformed or empty output", () => {
+    expect(() => parseCanonicalFrameHashes("# only comments")).toThrow(/no decoded/);
+    expect(() => parseCanonicalFrameHashes("0, 0, not-a-sha")).toThrow(/unexpected/);
+  });
+});
+
+describe("normalizeFfprobeMetadata()", () => {
+  it("normalizes relevant video, audio, and duration fields", () => {
+    expect(
+      normalizeFfprobeMetadata({
+        streams: [
+          {
+            codec_type: "video",
+            codec_name: "h264",
+            width: 320,
+            height: 180,
+            pix_fmt: "yuv420p",
+            avg_frame_rate: "30/1",
+            r_frame_rate: "30/1",
+            nb_frames: "60",
+            color_space: "bt709",
+            color_transfer: "bt709",
+            color_primaries: "bt709",
+          },
+          {
+            codec_type: "audio",
+            codec_name: "aac",
+            sample_rate: "48000",
+            channels: 2,
+            channel_layout: "stereo",
+          },
+        ],
+        format: { duration: "2.000000" },
+      }),
+    ).toEqual({
+      video: {
+        codecName: "h264",
+        width: 320,
+        height: 180,
+        pixelFormat: "yuv420p",
+        averageFrameRate: "30/1",
+        realFrameRate: "30/1",
+        frameCount: 60,
+        colorSpace: "bt709",
+        colorTransfer: "bt709",
+        colorPrimaries: "bt709",
+      },
+      audio: {
+        codecName: "aac",
+        sampleRate: 48_000,
+        channels: 2,
+        channelLayout: "stereo",
+      },
+      durationSeconds: 2,
+    });
+  });
+
+  it("uses stream duration and maps N/A values to null", () => {
+    expect(
+      normalizeFfprobeMetadata({
+        streams: [
+          {
+            codec_type: "video",
+            codec_name: "rawvideo",
+            width: 1,
+            height: 1,
+            nb_frames: "N/A",
+            duration: "0.5",
+          },
+        ],
+        format: {},
+      }),
+    ).toMatchObject({
+      video: { frameCount: null },
+      audio: null,
+      durationSeconds: 0.5,
+    });
+  });
+});
diff --git a/packages/producer/src/plan-parity-analysis.ts b/packages/producer/src/plan-parity-analysis.ts
new file mode 100644
index 000000000..3ab31650d
--- /dev/null
+++ b/packages/producer/src/plan-parity-analysis.ts
@@ -0,0 +1,306 @@
+import { createHash } from "node:crypto";
+import { createReadStream, readdirSync, statSync, type Dirent } from "node:fs";
+import { relative, resolve } from "node:path";
+import { spawn, spawnSync } from "node:child_process";
+import type {
+  PlanParityDriverResult,
+  PlanParityMediaMeasurement,
+  PlanParityMeasurement,
+  PlanParityStreamMetadata,
+} from "./plan-parity-contract.js";
+
+type JsonRecord = Record<string, unknown>;
+
+function isRecord(value: unknown): value is JsonRecord {
+  return typeof value === "object" && value !== null && !Array.isArray(value);
+}
+
+function stringValue(value: unknown): string | null {
+  return typeof value === "string" && value.length > 0 && value !== "N/A" ? value : null;
+}
+
+function numberValue(value: unknown): number | null {
+  if (typeof value === "number" && Number.isFinite(value)) return value;
+  if (typeof value !== "string" || value.length === 0 || value === "N/A") return null;
+  const parsed = Number(value);
+  return Number.isFinite(parsed) ? parsed : null;
+}
+
+function integerValue(value: unknown): number | null {
+  const parsed = numberValue(value);
+  return parsed === null || !Number.isInteger(parsed) ? null : parsed;
+}
+
+function requireCommandSuccess(
+  command: string,
+  args: string[],
+  maxBuffer = 64 * 1024 * 1024,
+): Buffer {
+  const result = spawnSync(command, args, {
+    encoding: "buffer",
+    maxBuffer,
+    stdio: ["ignore", "pipe", "pipe"],
+  });
+  if (result.error) throw result.error;
+  if (result.status !== 0) {
+    throw new Error(
+      `${command} exited ${result.status}: ${result.stderr.toString("utf-8").trim()}`,
+    );
+  }
+  return result.stdout;
+}
+
+export function parseCanonicalFrameHashes(framemd5: string): string[] {
+  const hashes: string[] = [];
+  for (const line of framemd5.split(/\r?\n/u)) {
+    const trimmed = line.trim();
+    if (trimmed.length === 0 || trimmed.startsWith("#")) continue;
+    const columns = trimmed.split(",").map((column) => column.trim());
+    const hash = columns.at(-1);
+    if (!hash || !/^[a-f0-9]{64}$/iu.test(hash)) {
+      throw new Error(`unexpected framemd5 row: ${line}`);
+    }
+    hashes.push(hash.toLowerCase());
+  }
+  if (hashes.length === 0) {
+    throw new Error("ffmpeg produced no decoded video frame hashes");
+  }
+  return hashes;
+}
+
+export function normalizeFfprobeMetadata(value: unknown): PlanParityStreamMetadata {
+  if (!isRecord(value)) throw new Error("ffprobe output must be a JSON object");
+  const rawStreams = value.streams;
+  if (!Array.isArray(rawStreams)) throw new Error("ffprobe output has no streams array");
+  const streams = rawStreams.filter(isRecord);
+  const video = streams.find((stream) => stream.codec_type === "video");
+  const audio = streams.find((stream) => stream.codec_type === "audio");
+  const format = isRecord(value.format) ? value.format : {};
+  const durationSeconds =
+    numberValue(format.duration) ??
+    Math.max(0, ...streams.map((stream) => numberValue(stream.duration) ?? 0));
+
+  return {
+    video: video
+      ? {
+          codecName: stringValue(video.codec_name),
+          width: integerValue(video.width) ?? 0,
+          height: integerValue(video.height) ?? 0,
+          pixelFormat: stringValue(video.pix_fmt),
+          averageFrameRate: stringValue(video.avg_frame_rate),
+          realFrameRate: stringValue(video.r_frame_rate),
+          frameCount: integerValue(video.nb_frames),
+          colorSpace: stringValue(video.color_space),
+          colorTransfer: stringValue(video.color_transfer),
+          colorPrimaries: stringValue(video.color_primaries),
+        }
+      : null,
+    audio: audio
+      ? {
+          codecName: stringValue(audio.codec_name),
+          sampleRate: integerValue(audio.sample_rate),
+          channels: integerValue(audio.channels),
+          channelLayout: stringValue(audio.channel_layout),
+        }
+      : null,
+    durationSeconds,
+  };
+}
+
+function probeMetadata(outputPath: string): PlanParityStreamMetadata {
+  const bytes = requireCommandSuccess("ffprobe", [
+    "-v",
+    "error",
+    "-show_entries",
+    [
+      "format=duration",
+      "stream=codec_type,codec_name,width,height,pix_fmt,avg_frame_rate,r_frame_rate,nb_frames",
+      "stream=color_space,color_transfer,color_primaries,sample_rate,channels,channel_layout,duration",
+    ].join(":"),
+    "-of",
+    "json",
+    outputPath,
+  ]);
+  return normalizeFfprobeMetadata(JSON.parse(bytes.toString("utf-8")) as unknown);
+}
+
+function canonicalFrameHashes(outputPath: string): string[] {
+  const bytes = requireCommandSuccess(
+    "ffmpeg",
+    [
+      "-hide_banner",
+      "-loglevel",
+      "error",
+      "-i",
+      outputPath,
+      "-map",
+      "0:v:0",
+      "-an",
+      "-pix_fmt",
+      "rgba",
+      "-hash",
+      "sha256",
+      "-f",
+      "framemd5",
+      "-",
+    ],
+    256 * 1024 * 1024,
+  );
+  return parseCanonicalFrameHashes(bytes.toString("utf-8"));
+}
+
+async function hashFile(path: string): Promise<{ sha256: string; bytes: number }> {
+  const hash = createHash("sha256");
+  let bytes = 0;
+  for await (const chunk of createReadStream(path)) {
+    const buffer = Buffer.isBuffer(chunk) ? chunk : Buffer.from(chunk);
+    hash.update(buffer);
+    bytes += buffer.length;
+  }
+  return { sha256: hash.digest("hex"), bytes };
+}
+
+function walkFiles(root: string, current = root): Array<{ absolute: string; relative: string }> {
+  const entries: Dirent[] = readdirSync(current, { withFileTypes: true }).sort((left, right) =>
+    left.name.localeCompare(right.name),
+  );
+  const files: Array<{ absolute: string; relative: string }> = [];
+  for (const entry of entries) {
+    const absolute = resolve(current, entry.name);
+    if (entry.isDirectory()) {
+      files.push(...walkFiles(root, absolute));
+    } else if (entry.isFile()) {
+      files.push({ absolute, relative: relative(root, absolute).replaceAll("\\", "/") });
+    }
+  }
+  return files;
+}
+
+async function hashPath(path: string): Promise<{ sha256: string; bytes: number }> {
+  const stat = statSync(path);
+  if (stat.isFile()) return hashFile(path);
+  if (!stat.isDirectory()) throw new Error(`cannot hash non-file artifact ${path}`);
+
+  const hash = createHash("sha256");
+  let bytes = 0;
+  for (const file of walkFiles(path)) {
+    const digest = await hashFile(file.absolute);
+    hash.update(file.relative);
+    hash.update("\0");
+    hash.update(digest.sha256);
+    hash.update("\0");
+    bytes += digest.bytes;
+  }
+  return { sha256: hash.digest("hex"), bytes };
+}
+
+async function canonicalPcmAudio(
+  outputPath: string,
+): Promise<PlanParityMediaMeasurement["pcmAudio"]> {
+  return new Promise((resolvePromise, reject) => {
+    const child = spawn(
+      "ffmpeg",
+      [
+        "-hide_banner",
+        "-loglevel",
+        "error",
+        "-i",
+        outputPath,
+        "-map",
+        "0:a:0",
+        "-vn",
+        "-ac",
+        "2",
+        "-ar",
+        "48000",
+        "-f",
+        "s16le",
+        "-",
+      ],
+      { stdio: ["ignore", "pipe", "pipe"] },
+    );
+    const hash = createHash("sha256");
+    const stderr: Buffer[] = [];
+    let bytes = 0;
+    child.stdout.on("data", (chunk: Buffer) => {
+      hash.update(chunk);
+      bytes += chunk.length;
+    });
+    child.stderr.on("data", (chunk: Buffer) => stderr.push(chunk));
+    child.on("error", reject);
+    child.on("close", (code) => {
+      if (code !== 0) {
+        const message = Buffer.concat(stderr).toString("utf-8");
+        // A video-only fixture is a valid parity input. ffmpeg uses this
+        // wording when the optional audio map has no match.
+        if (/matches no streams|does not contain any stream/iu.test(message)) {
+          resolvePromise(null);
+          return;
+        }
+        reject(new Error(`ffmpeg PCM decode exited ${code}: ${message.trim()}`));
+        return;
+      }
+      if (bytes % 4 !== 0) {
+        reject(new Error(`canonical stereo s16le byte count ${bytes} is not divisible by 4`));
+        return;
+      }
+      resolvePromise({
+        sha256: hash.digest("hex"),
+        sampleCount: bytes / 4,
+        bytes,
+      });
+    });
+  });
+}
+
+export async function analyzePlanParityDriverResult(
+  driverName: string,
+  result: PlanParityDriverResult,
+): Promise<PlanParityMeasurement> {
+  const output = await hashPath(result.outputPath);
+  const metadata = probeMetadata(result.outputPath);
+  const [pcmAudio, frameSha256] = await Promise.all([
+    metadata.audio ? canonicalPcmAudio(result.outputPath) : Promise.resolve(null),
+    Promise.resolve(canonicalFrameHashes(result.outputPath)),
+  ]);
+
+  const chunks = [];
+  for (const chunk of [...result.chunks].sort((left, right) => left.index - right.index)) {
+    const digest = await hashPath(chunk.path);
+    if (
+      chunk.reportedSha256 !== undefined &&
+      chunk.reportedSha256.toLowerCase() !== digest.sha256
+    ) {
+      throw new Error(
+        `chunk ${chunk.index} digest mismatch: adapter reported ${chunk.reportedSha256}, measured ${digest.sha256}`,
+      );
+    }
+    chunks.push({
+      index: chunk.index,
+      sha256: digest.sha256,
+      bytes: digest.bytes,
+      reportedSha256: chunk.reportedSha256,
+    });
+  }
+  const downloaded = result.transferBytes.downloaded;
+  const uploaded = result.transferBytes.uploaded;
+
+  return {
+    protocol: result.protocol,
+    driver: driverName,
+    media: {
+      outputSha256: output.sha256,
+      outputBytes: output.bytes,
+      frameSha256,
+      pcmAudio,
+      metadata,
+    },
+    chunks,
+    transferBytes: {
+      downloaded,
+      uploaded,
+      total: downloaded + uploaded,
+    },
+    peakMaterializedBytes: result.peakMaterializedBytes,
+  };
+}
diff --git a/packages/producer/src/plan-parity-contract.test.ts b/packages/producer/src/plan-parity-contract.test.ts
new file mode 100644
index 000000000..516c3ae7d
--- /dev/null
+++ b/packages/producer/src/plan-parity-contract.test.ts
@@ -0,0 +1,165 @@
+import { describe, expect, it } from "bun:test";
+import {
+  comparePlanParityMeasurements,
+  type PlanParityMeasurement,
+  type PlanParityProtocol,
+} from "./plan-parity-contract.js";
+
+function measurement(
+  protocol: PlanParityProtocol,
+  overrides: {
+    frames?: string[];
+    pcmSha?: string;
+    duration?: number;
+    outputSha?: string;
+    outputBytes?: number;
+    chunkSha?: string;
+    transferBytes?: number;
+    peakBytes?: number;
+  } = {},
+): PlanParityMeasurement {
+  const transferBytes = overrides.transferBytes ?? 100;
+  return {
+    protocol,
+    driver: "test",
+    media: {
+      outputSha256: overrides.outputSha ?? "encoded",
+      outputBytes: overrides.outputBytes ?? 1000,
+      frameSha256: overrides.frames ?? ["frame-0", "frame-1"],
+      pcmAudio: {
+        sha256: overrides.pcmSha ?? "pcm",
+        sampleCount: 96_000,
+        bytes: 384_000,
+      },
+      metadata: {
+        video: {
+          codecName: "h264",
+          width: 320,
+          height: 180,
+          pixelFormat: "yuv420p",
+          averageFrameRate: "30/1",
+          realFrameRate: "30/1",
+          frameCount: 60,
+          colorSpace: "bt709",
+          colorTransfer: "bt709",
+          colorPrimaries: "bt709",
+        },
+        audio: {
+          codecName: "aac",
+          sampleRate: 48_000,
+          channels: 2,
+          channelLayout: "stereo",
+        },
+        durationSeconds: overrides.duration ?? 2,
+      },
+    },
+    chunks: [
+      {
+        index: 0,
+        sha256: overrides.chunkSha ?? "chunk",
+        bytes: 500,
+      },
+    ],
+    transferBytes: {
+      downloaded: Math.floor(transferBytes / 2),
+      uploaded: Math.ceil(transferBytes / 2),
+      total: transferBytes,
+    },
+    peakMaterializedBytes: overrides.peakBytes ?? 2000,
+  };
+}
+
+describe("comparePlanParityMeasurements()", () => {
+  it("accepts semantic parity while only reporting encoded and transport differences", () => {
+    const result = comparePlanParityMeasurements(
+      measurement("v1", {
+        outputSha: "container-v1",
+        outputBytes: 1000,
+        transferBytes: 10_000,
+        peakBytes: 20_000,
+      }),
+      measurement("v2", {
+        outputSha: "container-v2",
+        outputBytes: 900,
+        transferBytes: 5000,
+        peakBytes: 6000,
+      }),
+    );
+
+    expect(result.passed).toBe(true);
+    expect(result.checks.find((entry) => entry.name === "encoded-output")?.detail).toContain(
+      "(reported)",
+    );
+    expect(result.checks.find((entry) => entry.name === "transfer-bytes")?.detail).toContain(
+      "v1=10000",
+    );
+  });
+
+  it("fails on decoded frame, PCM, metadata, duration, or chunk drift", () => {
+    const cases: Array<[string, PlanParityMeasurement]> = [
+      ["decoded-video-frames", measurement("v2", { frames: ["different"] })],
+      ["canonical-pcm-audio", measurement("v2", { pcmSha: "different" })],
+      [
+        "ffprobe-stream-metadata",
+        {
+          ...measurement("v2"),
+          media: {
+            ...measurement("v2").media,
+            metadata: {
+              ...measurement("v2").media.metadata,
+              video: {
+                ...measurement("v2").media.metadata.video!,
+                width: 640,
+              },
+            },
+          },
+        },
+      ],
+      ["ffprobe-duration", measurement("v2", { duration: 2.1 })],
+      ["chunk-hashes", measurement("v2", { chunkSha: "different" })],
+    ];
+
+    for (const [expectedFailure, v2] of cases) {
+      const result = comparePlanParityMeasurements(measurement("v1"), v2);
+      expect(result.passed).toBe(false);
+      expect(result.checks.find((entry) => entry.name === expectedFailure)?.passed).toBe(false);
+    }
+  });
+
+  it("can enforce encoded equality and v2 resource ceilings", () => {
+    const result = comparePlanParityMeasurements(
+      measurement("v1"),
+      measurement("v2", {
+        outputSha: "different",
+        transferBytes: 101,
+        peakBytes: 201,
+      }),
+      {
+        requireEncodedOutputEquality: true,
+        maxV2TransferBytes: 100,
+        maxV2PeakMaterializedBytes: 200,
+      },
+    );
+
+    expect(result.passed).toBe(false);
+    expect(result.checks.filter((entry) => !entry.passed).map((entry) => entry.name)).toEqual([
+      "encoded-output",
+      "transfer-bytes",
+      "peak-materialized-working-set",
+    ]);
+  });
+
+  it("rejects reversed or same-protocol comparisons", () => {
+    expect(() => comparePlanParityMeasurements(measurement("v2"), measurement("v1"))).toThrow(
+      /ordered v1\/v2/,
+    );
+    expect(() => comparePlanParityMeasurements(measurement("v1"), measurement("v1"))).toThrow(
+      /ordered v1\/v2/,
+    );
+  });
+
+  it("does not expose or compare planHash", () => {
+    const result = comparePlanParityMeasurements(measurement("v1"), measurement("v2"));
+    expect(JSON.stringify(result)).not.toContain("planHash");
+  });
+});
diff --git a/packages/producer/src/plan-parity-contract.ts b/packages/producer/src/plan-parity-contract.ts
new file mode 100644
index 000000000..0b783a114
--- /dev/null
+++ b/packages/producer/src/plan-parity-contract.ts
@@ -0,0 +1,254 @@
+/**
+ * Protocol-neutral contract for comparing distributed render plans.
+ *
+ * The comparator intentionally has no `planHash` field. v1 and v2 use
+ * different artifact layouts and hash schemas, so their plan hashes are not
+ * expected to match even when they render identical output.
+ */
+
+export type PlanParityProtocol = "v1" | "v2";
+
+export interface PlanParityRenderConfig {
+  fps: 24 | 30 | 60;
+  width: number;
+  height: number;
+  format: "mp4";
+  chunkSize?: number;
+  maxParallelChunks?: number;
+}
+
+export interface PlanParityDriverInput {
+  protocol: PlanParityProtocol;
+  projectDir: string;
+  outputDir: string;
+  renderConfig: PlanParityRenderConfig;
+  /**
+   * Test-only plan limit. The Lambda-local driver forwards this to v1 as
+   * `planDirSizeLimitBytes`; v2 ignores it because it does not materialize a
+   * monolithic plan directory.
+   */
+  planSizeCapBytes?: number;
+}
+
+export interface PlanParityChunkArtifact {
+  index: number;
+  path: string;
+  /** Adapter-reported digest, retained for diagnostics. */
+  reportedSha256?: string;
+}
+
+export interface PlanParityDriverResult {
+  protocol: PlanParityProtocol;
+  outputPath: string;
+  chunks: PlanParityChunkArtifact[];
+  transferBytes: {
+    downloaded: number;
+    uploaded: number;
+  };
+  /**
+   * Maximum materialized bytes observed in the worker scratch directory.
+   * This is distinct from S3 storage and from process RSS.
+   */
+  peakMaterializedBytes: number;
+}
+
+export interface PlanParityDriver {
+  readonly name: string;
+  render(input: PlanParityDriverInput): Promise<PlanParityDriverResult>;
+}
+
+export interface PlanParityStreamMetadata {
+  video: {
+    codecName: string | null;
+    width: number;
+    height: number;
+    pixelFormat: string | null;
+    averageFrameRate: string | null;
+    realFrameRate: string | null;
+    frameCount: number | null;
+    colorSpace: string | null;
+    colorTransfer: string | null;
+    colorPrimaries: string | null;
+  } | null;
+  audio: {
+    codecName: string | null;
+    sampleRate: number | null;
+    channels: number | null;
+    channelLayout: string | null;
+  } | null;
+  durationSeconds: number;
+}
+
+export interface PlanParityMediaMeasurement {
+  outputSha256: string;
+  outputBytes: number;
+  frameSha256: string[];
+  pcmAudio: {
+    sha256: string;
+    /**
+     * Interleaved audio frames after canonical decoding to signed 16-bit,
+     * 48 kHz, stereo PCM. One sample frame contains two channel samples.
+     */
+    sampleCount: number;
+    bytes: number;
+  } | null;
+  metadata: PlanParityStreamMetadata;
+}
+
+export interface PlanParityChunkMeasurement {
+  index: number;
+  sha256: string;
+  bytes: number;
+  reportedSha256?: string;
+}
+
+export interface PlanParityMeasurement {
+  protocol: PlanParityProtocol;
+  driver: string;
+  media: PlanParityMediaMeasurement;
+  chunks: PlanParityChunkMeasurement[];
+  transferBytes: {
+    downloaded: number;
+    uploaded: number;
+    total: number;
+  };
+  peakMaterializedBytes: number;
+}
+
+export interface PlanParityComparisonOptions {
+  /** ffprobe duration tolerance. Defaults to 1 ms. */
+  durationToleranceSeconds?: number;
+  /**
+   * Encoded containers can contain non-semantic metadata. Default false:
+   * report output digest/size without requiring byte-identical containers.
+   */
+  requireEncodedOutputEquality?: boolean;
+  /** Optional ceiling applied independently to the v2 run. */
+  maxV2TransferBytes?: number;
+  /** Optional ceiling applied independently to the v2 run. */
+  maxV2PeakMaterializedBytes?: number;
+}
+
+export interface PlanParityCheck {
+  name: string;
+  passed: boolean;
+  detail: string;
+}
+
+export interface PlanParityComparison {
+  passed: boolean;
+  checks: PlanParityCheck[];
+  v1: PlanParityMeasurement;
+  v2: PlanParityMeasurement;
+}
+
+function check(name: string, passed: boolean, detail: string): PlanParityCheck {
+  return { name, passed, detail };
+}
+
+function equalJson(left: unknown, right: unknown): boolean {
+  return JSON.stringify(left) === JSON.stringify(right);
+}
+
+function comparableMetadata(
+  metadata: PlanParityStreamMetadata,
+): Omit<PlanParityStreamMetadata, "durationSeconds"> {
+  return {
+    video: metadata.video,
+    audio: metadata.audio,
+  };
+}
+
+/**
+ * Compare semantic render output plus transport/resource measurements.
+ *
+ * `outputBytes`, transfer bytes, and working-set bytes are always surfaced.
+ * They are not equality gates by default: v2 is expected to change artifact
+ * packaging, and encoded containers may carry non-semantic differences.
+ */
+// This function is intentionally an exhaustive, flat contract checklist. Each
+// branch emits a distinct diagnostic needed to root-cause parity failures.
+// fallow-ignore-next-line complexity
+export function comparePlanParityMeasurements(
+  v1: PlanParityMeasurement,
+  v2: PlanParityMeasurement,
+  options: PlanParityComparisonOptions = {},
+): PlanParityComparison {
+  if (v1.protocol !== "v1" || v2.protocol !== "v2") {
+    throw new Error(
+      `plan parity requires ordered v1/v2 measurements (got ${v1.protocol}/${v2.protocol})`,
+    );
+  }
+
+  const durationToleranceSeconds = options.durationToleranceSeconds ?? 0.001;
+  const durationDelta = Math.abs(
+    v1.media.metadata.durationSeconds - v2.media.metadata.durationSeconds,
+  );
+  const checks: PlanParityCheck[] = [
+    check(
+      "decoded-video-frames",
+      equalJson(v1.media.frameSha256, v2.media.frameSha256),
+      `v1=${v1.media.frameSha256.length} frames, v2=${v2.media.frameSha256.length} frames`,
+    ),
+    check(
+      "canonical-pcm-audio",
+      equalJson(v1.media.pcmAudio, v2.media.pcmAudio),
+      v1.media.pcmAudio && v2.media.pcmAudio
+        ? `v1=${v1.media.pcmAudio.sampleCount} samples, v2=${v2.media.pcmAudio.sampleCount} samples`
+        : `v1=${v1.media.pcmAudio ? "present" : "none"}, v2=${v2.media.pcmAudio ? "present" : "none"}`,
+    ),
+    check(
+      "ffprobe-stream-metadata",
+      equalJson(comparableMetadata(v1.media.metadata), comparableMetadata(v2.media.metadata)),
+      "normalized video/audio stream metadata",
+    ),
+    check(
+      "ffprobe-duration",
+      durationDelta <= durationToleranceSeconds,
+      `delta=${durationDelta.toFixed(6)}s, tolerance=${durationToleranceSeconds.toFixed(6)}s`,
+    ),
+    check(
+      "chunk-hashes",
+      equalJson(
+        v1.chunks.map(({ index, sha256, bytes }) => ({ index, sha256, bytes })),
+        v2.chunks.map(({ index, sha256, bytes }) => ({ index, sha256, bytes })),
+      ),
+      `v1=${v1.chunks.length} chunks/${v1.chunks.reduce((sum, chunk) => sum + chunk.bytes, 0)} bytes, ` +
+        `v2=${v2.chunks.length} chunks/${v2.chunks.reduce((sum, chunk) => sum + chunk.bytes, 0)} bytes`,
+    ),
+    check(
+      "encoded-output",
+      options.requireEncodedOutputEquality !== true ||
+        (v1.media.outputSha256 === v2.media.outputSha256 &&
+          v1.media.outputBytes === v2.media.outputBytes),
+      `v1=${v1.media.outputBytes} bytes/${v1.media.outputSha256}, ` +
+        `v2=${v2.media.outputBytes} bytes/${v2.media.outputSha256}` +
+        (options.requireEncodedOutputEquality === true ? " (strict)" : " (reported)"),
+    ),
+    check(
+      "transfer-bytes",
+      options.maxV2TransferBytes === undefined ||
+        v2.transferBytes.total <= options.maxV2TransferBytes,
+      `v1=${v1.transferBytes.total} bytes, v2=${v2.transferBytes.total} bytes` +
+        (options.maxV2TransferBytes === undefined
+          ? " (reported)"
+          : `, v2 limit=${options.maxV2TransferBytes}`),
+    ),
+    check(
+      "peak-materialized-working-set",
+      options.maxV2PeakMaterializedBytes === undefined ||
+        v2.peakMaterializedBytes <= options.maxV2PeakMaterializedBytes,
+      `v1=${v1.peakMaterializedBytes} bytes, v2=${v2.peakMaterializedBytes} bytes` +
+        (options.maxV2PeakMaterializedBytes === undefined
+          ? " (reported)"
+          : `, v2 limit=${options.maxV2PeakMaterializedBytes}`),
+    ),
+  ];
+
+  return {
+    passed: checks.every((entry) => entry.passed),
+    checks,
+    v1,
+    v2,
+  };
+}
diff --git a/packages/producer/src/plan-parity-fixture.test.ts b/packages/producer/src/plan-parity-fixture.test.ts
new file mode 100644
index 000000000..1d9ae94ce
--- /dev/null
+++ b/packages/producer/src/plan-parity-fixture.test.ts
@@ -0,0 +1,66 @@
+import { createHash } from "node:crypto";
+import { mkdtempSync, readFileSync, rmSync, statSync } from "node:fs";
+import { tmpdir } from "node:os";
+import { join } from "node:path";
+import { afterEach, describe, expect, it } from "bun:test";
+import {
+  generatePressureBytes,
+  generateToneWav,
+  preparePlanParityFixture,
+} from "./plan-parity-fixture.js";
+
+const cleanup: string[] = [];
+afterEach(() => {
+  for (const path of cleanup.splice(0)) {
+    rmSync(path, { recursive: true, force: true });
+  }
+});
+
+describe("plan parity generated fixtures", () => {
+  it("generates a valid deterministic mono PCM WAV", () => {
+    const config = { durationSeconds: 0.25, frequencyHz: 440, sampleRate: 48_000 };
+    const first = generateToneWav(config);
+    const second = generateToneWav(config);
+    expect(first.equals(second)).toBe(true);
+    expect(first.subarray(0, 4).toString("ascii")).toBe("RIFF");
+    expect(first.subarray(8, 12).toString("ascii")).toBe("WAVE");
+    expect(first.readUInt32LE(24)).toBe(48_000);
+    expect(first.readUInt32LE(40)).toBe(24_000);
+    expect(first.length).toBe(24_044);
+  });
+
+  it("generates deterministic size-pressure bytes that vary with the seed", () => {
+    const first = generatePressureBytes(65_536, 123);
+    const again = generatePressureBytes(65_536, 123);
+    const other = generatePressureBytes(65_536, 124);
+    expect(first.equals(again)).toBe(true);
+    expect(first.equals(other)).toBe(false);
+    expect(new Set(first).size).toBeGreaterThan(240);
+  });
+
+  it("materializes the checked-in visual/audio fixture", () => {
+    const target = mkdtempSync(join(tmpdir(), "hf-plan-parity-fixture-"));
+    cleanup.push(target);
+    preparePlanParityFixture(
+      join(import.meta.dir, "..", "fixtures", "plan-parity-visual-audio"),
+      target,
+    );
+    const tone = readFileSync(join(target, "assets", "tone.wav"));
+    expect(tone.subarray(0, 4).toString("ascii")).toBe("RIFF");
+    expect(readFileSync(join(target, "index.html"), "utf-8")).toContain("assets/tone.wav");
+  });
+
+  it("materializes a small compression-resistant pressure payload", () => {
+    const target = mkdtempSync(join(tmpdir(), "hf-plan-parity-pressure-"));
+    cleanup.push(target);
+    preparePlanParityFixture(
+      join(import.meta.dir, "..", "fixtures", "plan-parity-size-pressure"),
+      target,
+    );
+    const pressurePath = join(target, "unused-pressure.bin");
+    expect(statSync(pressurePath).size).toBe(65_536);
+    expect(createHash("sha256").update(readFileSync(pressurePath)).digest("hex")).toBe(
+      "0e5f00e17597a73cf7a273d772456db0544959ed19a437954fd800a78447f468",
+    );
+  });
+});
diff --git a/packages/producer/src/plan-parity-fixture.ts b/packages/producer/src/plan-parity-fixture.ts
new file mode 100644
index 000000000..35687861c
--- /dev/null
+++ b/packages/producer/src/plan-parity-fixture.ts
@@ -0,0 +1,155 @@
+import { cpSync, existsSync, mkdirSync, readFileSync, writeFileSync } from "node:fs";
+import { dirname, join } from "node:path";
+
+const FIXTURE_CONFIG_FILE = ".plan-parity-fixture.json";
+
+interface GeneratedAudioConfig {
+  path: string;
+  durationSeconds: number;
+  frequencyHz: number;
+  sampleRate: number;
+}
+
+interface GeneratedPressureFileConfig {
+  path: string;
+  bytes: number;
+  seed: number;
+}
+
+interface PlanParityFixtureConfig {
+  generatedAudio?: GeneratedAudioConfig;
+  generatedPressureFile?: GeneratedPressureFileConfig;
+}
+
+function isRecord(value: unknown): value is Record<string, unknown> {
+  return typeof value === "object" && value !== null && !Array.isArray(value);
+}
+
+function positiveNumber(record: Record<string, unknown>, key: string): number {
+  const value = record[key];
+  if (typeof value !== "number" || !Number.isFinite(value) || value <= 0) {
+    throw new Error(`${FIXTURE_CONFIG_FILE}: ${key} must be a positive number`);
+  }
+  return value;
+}
+
+function relativePath(record: Record<string, unknown>, key: string): string {
+  const value = record[key];
+  if (
+    typeof value !== "string" ||
+    value.length === 0 ||
+    value.startsWith("/") ||
+    value.split(/[\\/]/u).includes("..")
+  ) {
+    throw new Error(`${FIXTURE_CONFIG_FILE}: ${key} must be a safe relative path`);
+  }
+  return value;
+}
+
+function parseGeneratedAudio(value: unknown): GeneratedAudioConfig | undefined {
+  if (value === undefined) return undefined;
+  if (!isRecord(value)) throw new Error(`${FIXTURE_CONFIG_FILE}: generatedAudio must be an object`);
+  return {
+    path: relativePath(value, "path"),
+    durationSeconds: positiveNumber(value, "durationSeconds"),
+    frequencyHz: positiveNumber(value, "frequencyHz"),
+    sampleRate: positiveNumber(value, "sampleRate"),
+  };
+}
+
+function parsePressureFile(value: unknown): GeneratedPressureFileConfig | undefined {
+  if (value === undefined) return undefined;
+  if (!isRecord(value)) {
+    throw new Error(`${FIXTURE_CONFIG_FILE}: generatedPressureFile must be an object`);
+  }
+  const bytes = positiveNumber(value, "bytes");
+  const seed = positiveNumber(value, "seed");
+  if (!Number.isInteger(bytes) || !Number.isInteger(seed)) {
+    throw new Error(`${FIXTURE_CONFIG_FILE}: pressure bytes and seed must be integers`);
+  }
+  return {
+    path: relativePath(value, "path"),
+    bytes,
+    seed,
+  };
+}
+
+function readFixtureConfig(projectDir: string): PlanParityFixtureConfig {
+  const configPath = join(projectDir, FIXTURE_CONFIG_FILE);
+  if (!existsSync(configPath)) return {};
+  const raw = JSON.parse(readFileSync(configPath, "utf-8")) as unknown;
+  if (!isRecord(raw)) throw new Error(`${FIXTURE_CONFIG_FILE}: root must be an object`);
+  return {
+    generatedAudio: parseGeneratedAudio(raw.generatedAudio),
+    generatedPressureFile: parsePressureFile(raw.generatedPressureFile),
+  };
+}
+
+function writeAscii(buffer: Buffer, offset: number, value: string): void {
+  buffer.write(value, offset, value.length, "ascii");
+}
+
+/** Generate a deterministic mono PCM WAV without relying on ffmpeg. */
+export function generateToneWav(config: Omit<GeneratedAudioConfig, "path">): Buffer {
+  const sampleCount = Math.round(config.durationSeconds * config.sampleRate);
+  const pcmBytes = sampleCount * 2;
+  const wav = Buffer.alloc(44 + pcmBytes);
+  writeAscii(wav, 0, "RIFF");
+  wav.writeUInt32LE(36 + pcmBytes, 4);
+  writeAscii(wav, 8, "WAVE");
+  writeAscii(wav, 12, "fmt ");
+  wav.writeUInt32LE(16, 16);
+  wav.writeUInt16LE(1, 20);
+  wav.writeUInt16LE(1, 22);
+  wav.writeUInt32LE(config.sampleRate, 24);
+  wav.writeUInt32LE(config.sampleRate * 2, 28);
+  wav.writeUInt16LE(2, 32);
+  wav.writeUInt16LE(16, 34);
+  writeAscii(wav, 36, "data");
+  wav.writeUInt32LE(pcmBytes, 40);
+  for (let sample = 0; sample < sampleCount; sample += 1) {
+    const phase = (2 * Math.PI * config.frequencyHz * sample) / config.sampleRate;
+    const value = Math.round(Math.sin(phase) * 0.25 * 32767);
+    wav.writeInt16LE(value, 44 + sample * 2);
+  }
+  return wav;
+}
+
+/** Deterministic xorshift bytes that do not collapse into a tiny gzip. */
+export function generatePressureBytes(bytes: number, seed: number): Buffer {
+  const output = Buffer.alloc(bytes);
+  let state = seed >>> 0;
+  for (let index = 0; index < bytes; index += 1) {
+    state ^= state << 13;
+    state ^= state >>> 17;
+    state ^= state << 5;
+    output[index] = state & 0xff;
+  }
+  return output;
+}
+
+/**
+ * Copy a checked-in fixture into a driver-owned project directory and
+ * materialize its generated binary assets. Source fixtures stay small and
+ * reviewable; size-pressure tests can vary their v1 cap without allocating
+ * multi-gigabyte files.
+ */
+export function preparePlanParityFixture(sourceDir: string, projectDir: string): void {
+  mkdirSync(projectDir, { recursive: true });
+  cpSync(sourceDir, projectDir, { recursive: true });
+  const config = readFixtureConfig(projectDir);
+
+  if (config.generatedAudio) {
+    const target = join(projectDir, config.generatedAudio.path);
+    mkdirSync(dirname(target), { recursive: true });
+    writeFileSync(target, generateToneWav(config.generatedAudio));
+  }
+  if (config.generatedPressureFile) {
+    const target = join(projectDir, config.generatedPressureFile.path);
+    mkdirSync(dirname(target), { recursive: true });
+    writeFileSync(
+      target,
+      generatePressureBytes(config.generatedPressureFile.bytes, config.generatedPressureFile.seed),
+    );
+  }
+}
diff --git a/packages/producer/src/plan-parity-harness.test.ts b/packages/producer/src/plan-parity-harness.test.ts
new file mode 100644
index 000000000..aae449507
--- /dev/null
+++ b/packages/producer/src/plan-parity-harness.test.ts
@@ -0,0 +1,188 @@
+import { mkdtempSync, readFileSync, rmSync, writeFileSync } from "node:fs";
+import { tmpdir } from "node:os";
+import { join } from "node:path";
+import { afterEach, describe, expect, it } from "bun:test";
+import type { PlanParityDriver, PlanParityMeasurement } from "./plan-parity-contract.js";
+import {
+  classifyPlanTooLargeProbeFailure,
+  parsePlanParityArgs,
+  runPlanV2SizePressure,
+} from "./plan-parity-harness.js";
+
+const cleanup: string[] = [];
+afterEach(() => {
+  for (const target of cleanup.splice(0)) {
+    rmSync(target, { recursive: true, force: true });
+  }
+});
+
+function fakeV2Measurement(): PlanParityMeasurement {
+  return {
+    protocol: "v2",
+    driver: "fake-lambda-local",
+    media: {
+      outputSha256: "output",
+      outputBytes: 123,
+      frameSha256: ["frame"],
+      pcmAudio: null,
+      metadata: {
+        video: null,
+        audio: null,
+        durationSeconds: 1,
+      },
+    },
+    chunks: [],
+    transferBytes: {
+      downloaded: 10,
+      uploaded: 20,
+      total: 30,
+    },
+    peakMaterializedBytes: 40,
+  };
+}
+
+describe("parsePlanParityArgs()", () => {
+  it("defaults both explicit protocol runs to lambda-local", () => {
+    const options = parsePlanParityArgs(["node", "plan-parity"]);
+    expect(options.v1Target).toBe("lambda-local");
+    expect(options.v2Target).toBe("lambda-local");
+    expect(options.renderConfig).toMatchObject({
+      fps: 30,
+      width: 320,
+      height: 180,
+      format: "mp4",
+    });
+    expect(options.expectV1PlanTooLarge).toBe(false);
+  });
+
+  it("parses resource gates and a low v1 size cap", () => {
+    const options = parsePlanParityArgs([
+      "node",
+      "plan-parity",
+      "--v1-plan-size-cap-bytes=32768",
+      "--max-v2-transfer-bytes",
+      "1048576",
+      "--max-v2-peak-materialized-bytes",
+      "524288",
+      "--strict-encoded-output=false",
+      "--chunk-size",
+      "15",
+      "--expect-v1-plan-too-large",
+    ]);
+    expect(options.v1PlanSizeCapBytes).toBe(32_768);
+    expect(options.comparison.maxV2TransferBytes).toBe(1_048_576);
+    expect(options.comparison.maxV2PeakMaterializedBytes).toBe(524_288);
+    expect(options.comparison.requireEncodedOutputEquality).toBe(false);
+    expect(options.renderConfig.chunkSize).toBe(15);
+    expect(options.expectV1PlanTooLarge).toBe(true);
+  });
+
+  it("reserves an explicit deployed-AWS target grammar", () => {
+    const options = parsePlanParityArgs([
+      "node",
+      "plan-parity",
+      "--v1-target",
+      "aws:hf-plan-v1-test",
+      "--v2-target",
+      "aws:hf-plan-v2-test",
+    ]);
+    expect(options.v1Target).toBe("aws:hf-plan-v1-test");
+    expect(options.v2Target).toBe("aws:hf-plan-v2-test");
+  });
+
+  it("rejects bad targets and numeric flags", () => {
+    expect(() => parsePlanParityArgs(["node", "plan-parity", "--v2-target", "production"])).toThrow(
+      /lambda-local or aws/,
+    );
+    expect(() =>
+      parsePlanParityArgs(["node", "plan-parity", "--v1-plan-size-cap-bytes", "-1"]),
+    ).toThrow(/positive integer/);
+    expect(() => parsePlanParityArgs(["node", "plan-parity", "--fps", "25"])).toThrow(
+      /24, 30, or 60/,
+    );
+    expect(() =>
+      parsePlanParityArgs(["node", "plan-parity", "--duration-tolerance-seconds", "not-a-number"]),
+    ).toThrow(/non-negative finite number/);
+  });
+});
+
+describe("runPlanV2SizePressure()", () => {
+  it("records typed v1 PLAN_TOO_LARGE and still completes explicit v2", async () => {
+    const fixtureDir = mkdtempSync(join(tmpdir(), "hf-plan-pressure-fixture-"));
+    const artifactsDir = mkdtempSync(join(tmpdir(), "hf-plan-pressure-report-"));
+    cleanup.push(fixtureDir, artifactsDir);
+    writeFileSync(join(fixtureDir, "index.html"), "<html></html>", "utf-8");
+    const calls: string[] = [];
+    const driver: PlanParityDriver = {
+      name: "fake-lambda-local",
+      async render(input) {
+        calls.push(input.protocol);
+        if (input.protocol === "v1") {
+          const error = new Error("synthetic cap exceeded") as Error & {
+            code: "PLAN_TOO_LARGE";
+            sizeBytes: number;
+            limitBytes: number;
+          };
+          error.code = "PLAN_TOO_LARGE";
+          error.sizeBytes = 65_536;
+          error.limitBytes = 32_768;
+          throw error;
+        }
+        return {
+          protocol: "v2",
+          outputPath: join(input.outputDir, "output.mp4"),
+          chunks: [],
+          transferBytes: { downloaded: 10, uploaded: 20 },
+          peakMaterializedBytes: 40,
+        };
+      },
+    };
+
+    const report = await runPlanV2SizePressure({
+      fixtureDir,
+      artifactsDir,
+      driver,
+      renderConfig: {
+        fps: 30,
+        width: 320,
+        height: 180,
+        format: "mp4",
+      },
+      v1PlanSizeCapBytes: 32_768,
+      analyzeDriverResult: async () => fakeV2Measurement(),
+    });
+
+    expect(calls).toEqual(["v1", "v2"]);
+    expect(report.passed).toBe(true);
+    expect(report.v1).toEqual({
+      status: "expected-failure",
+      code: "PLAN_TOO_LARGE",
+      message: "synthetic cap exceeded",
+      sizeBytes: 65_536,
+      limitBytes: 32_768,
+    });
+    expect(report.v2.status).toBe("success");
+    const written = JSON.parse(
+      readFileSync(join(artifactsDir, "plan-too-large-v2-report.json"), "utf-8"),
+    ) as {
+      passed: boolean;
+      v1: { code: string };
+      v2: { status: string };
+    };
+    expect(written).toMatchObject({
+      passed: true,
+      v1: { code: "PLAN_TOO_LARGE" },
+      v2: { status: "success" },
+    });
+  });
+
+  it("distinguishes non-PLAN_TOO_LARGE failures", () => {
+    const error = new Error("network down") as Error & { code: string };
+    error.code = "S3_UNAVAILABLE";
+    expect(classifyPlanTooLargeProbeFailure(error)).toEqual({
+      status: "unexpected-failure",
+      code: "S3_UNAVAILABLE",
+      message: "network down",
+    });
+  });
+});
diff --git a/packages/producer/src/plan-parity-harness.ts b/packages/producer/src/plan-parity-harness.ts
new file mode 100644
index 000000000..12a7cda80
--- /dev/null
+++ b/packages/producer/src/plan-parity-harness.ts
@@ -0,0 +1,452 @@
+import { existsSync, mkdirSync, writeFileSync } from "node:fs";
+import { resolve } from "node:path";
+import process from "node:process";
+import { analyzePlanParityDriverResult } from "./plan-parity-analysis.js";
+import {
+  comparePlanParityMeasurements,
+  type PlanParityComparison,
+  type PlanParityComparisonOptions,
+  type PlanParityDriver,
+  type PlanParityDriverResult,
+  type PlanParityMeasurement,
+  type PlanParityRenderConfig,
+} from "./plan-parity-contract.js";
+import { preparePlanParityFixture } from "./plan-parity-fixture.js";
+
+export type PlanParityTarget = "lambda-local" | `aws:${string}`;
+
+export interface RunPlanProtocolParityOptions {
+  fixtureDir: string;
+  artifactsDir: string;
+  v1Driver: PlanParityDriver;
+  v2Driver: PlanParityDriver;
+  renderConfig: PlanParityRenderConfig;
+  v1PlanSizeCapBytes?: number;
+  comparison?: PlanParityComparisonOptions;
+}
+
+export interface PlanParityCliOptions {
+  fixtureDir: string;
+  artifactsDir: string;
+  v1Target: PlanParityTarget;
+  v2Target: PlanParityTarget;
+  renderConfig: PlanParityRenderConfig;
+  v1PlanSizeCapBytes?: number;
+  expectV1PlanTooLarge: boolean;
+  comparison: PlanParityComparisonOptions;
+}
+
+export interface RunPlanV2SizePressureOptions {
+  fixtureDir: string;
+  artifactsDir: string;
+  driver: PlanParityDriver;
+  renderConfig: PlanParityRenderConfig;
+  v1PlanSizeCapBytes: number;
+  /**
+   * Test seam for the post-render media analyzer. Production callers use
+   * the canonical ffmpeg/ffprobe analyzer.
+   */
+  analyzeDriverResult?: (
+    driverName: string,
+    result: PlanParityDriverResult,
+  ) => Promise<PlanParityMeasurement>;
+}
+
+export type PlanTooLargeProbeOutcome =
+  | {
+      status: "expected-failure";
+      code: "PLAN_TOO_LARGE";
+      message: string;
+      sizeBytes: number | null;
+      limitBytes: number | null;
+    }
+  | {
+      status: "unexpected-success";
+      message: string;
+    }
+  | {
+      status: "unexpected-failure";
+      code: string | null;
+      message: string;
+    };
+
+export type PlanV2PressureOutcome =
+  | {
+      status: "success";
+      measurement: PlanParityMeasurement;
+    }
+  | {
+      status: "failure";
+      message: string;
+    };
+
+export interface PlanV2SizePressureReport {
+  passed: boolean;
+  checks: Array<{
+    name: "v1-plan-too-large" | "v2-render-success";
+    passed: boolean;
+    detail: string;
+  }>;
+  v1: PlanTooLargeProbeOutcome;
+  v2: PlanV2PressureOutcome;
+}
+
+function parsePositiveInteger(name: string, value: string | undefined): number | undefined {
+  if (value === undefined) return undefined;
+  const parsed = Number(value);
+  if (!Number.isInteger(parsed) || parsed <= 0) {
+    throw new Error(`plan parity: --${name} must be a positive integer`);
+  }
+  return parsed;
+}
+
+function parseNonNegativeNumber(name: string, value: string | undefined): number | undefined {
+  if (value === undefined) return undefined;
+  const parsed = Number(value);
+  if (!Number.isFinite(parsed) || parsed < 0) {
+    throw new Error(`plan parity: --${name} must be a non-negative finite number`);
+  }
+  return parsed;
+}
+
+function parseBoolean(name: string, value: string | undefined): boolean {
+  if (value === undefined || value === "true") return true;
+  if (value === "false") return false;
+  throw new Error(`plan parity: --${name} must be true or false`);
+}
+
+function parseTarget(name: string, value: string | undefined): PlanParityTarget {
+  const target = value ?? "lambda-local";
+  if (target === "lambda-local") return target;
+  if (target.startsWith("aws:") && target.length > "aws:".length) {
+    return target as `aws:${string}`;
+  }
+  throw new Error(
+    `plan parity: --${name} must be lambda-local or aws:<isolated-stack> (got ${JSON.stringify(target)})`,
+  );
+}
+
+function collectArgs(argv: string[]): Map<string, string> {
+  const args = new Map<string, string>();
+  for (let index = 2; index < argv.length; index += 1) {
+    const token = argv[index];
+    if (!token?.startsWith("--")) {
+      throw new Error(`plan parity: unexpected positional argument ${JSON.stringify(token)}`);
+    }
+    const equals = token.indexOf("=");
+    if (equals > 2) {
+      args.set(token.slice(2, equals), token.slice(equals + 1));
+      continue;
+    }
+    const key = token.slice(2);
+    const next = argv[index + 1];
+    if (!next || next.startsWith("--")) {
+      args.set(key, "true");
+      continue;
+    }
+    args.set(key, next);
+    index += 1;
+  }
+  return args;
+}
+
+export function parsePlanParityArgs(argv: string[]): PlanParityCliOptions {
+  const args = collectArgs(argv);
+  const fixtureDir = resolve(args.get("fixture") ?? "fixtures/plan-parity-visual-audio");
+  const artifactsDir = resolve(args.get("artifacts-dir") ?? ".debug/plan-protocol-parity");
+  const fps = parsePositiveInteger("fps", args.get("fps")) ?? 30;
+  if (fps !== 24 && fps !== 30 && fps !== 60) {
+    throw new Error("plan parity: --fps must be 24, 30, or 60");
+  }
+
+  return {
+    fixtureDir,
+    artifactsDir,
+    v1Target: parseTarget("v1-target", args.get("v1-target")),
+    v2Target: parseTarget("v2-target", args.get("v2-target")),
+    renderConfig: {
+      fps,
+      width: parsePositiveInteger("width", args.get("width")) ?? 320,
+      height: parsePositiveInteger("height", args.get("height")) ?? 180,
+      format: "mp4",
+      chunkSize: parsePositiveInteger("chunk-size", args.get("chunk-size")),
+      maxParallelChunks: parsePositiveInteger(
+        "max-parallel-chunks",
+        args.get("max-parallel-chunks"),
+      ),
+    },
+    v1PlanSizeCapBytes: parsePositiveInteger(
+      "v1-plan-size-cap-bytes",
+      args.get("v1-plan-size-cap-bytes"),
+    ),
+    expectV1PlanTooLarge:
+      args.get("expect-v1-plan-too-large") === undefined
+        ? false
+        : parseBoolean("expect-v1-plan-too-large", args.get("expect-v1-plan-too-large")),
+    comparison: {
+      durationToleranceSeconds: parseNonNegativeNumber(
+        "duration-tolerance-seconds",
+        args.get("duration-tolerance-seconds"),
+      ),
+      requireEncodedOutputEquality:
+        args.get("strict-encoded-output") === undefined
+          ? false
+          : parseBoolean("strict-encoded-output", args.get("strict-encoded-output")),
+      maxV2TransferBytes: parsePositiveInteger(
+        "max-v2-transfer-bytes",
+        args.get("max-v2-transfer-bytes"),
+      ),
+      maxV2PeakMaterializedBytes: parsePositiveInteger(
+        "max-v2-peak-materialized-bytes",
+        args.get("max-v2-peak-materialized-bytes"),
+      ),
+    },
+  };
+}
+
+function errorMessage(error: unknown): string {
+  return error instanceof Error ? error.message : String(error);
+}
+
+function isRecord(value: unknown): value is Record<string, unknown> {
+  return typeof value === "object" && value !== null;
+}
+
+function errorCode(error: unknown): string | null {
+  if (isRecord(error) && typeof error.code === "string") {
+    return error.code;
+  }
+  return null;
+}
+
+function errorNumber(error: unknown, field: "sizeBytes" | "limitBytes"): number | null {
+  if (isRecord(error)) {
+    const value = error[field];
+    if (typeof value === "number" && Number.isFinite(value)) return value;
+  }
+  return null;
+}
+
+export function classifyPlanTooLargeProbeFailure(error: unknown): PlanTooLargeProbeOutcome {
+  const code = errorCode(error);
+  if (code === "PLAN_TOO_LARGE") {
+    return {
+      status: "expected-failure",
+      code,
+      message: errorMessage(error),
+      sizeBytes: errorNumber(error, "sizeBytes"),
+      limitBytes: errorNumber(error, "limitBytes"),
+    };
+  }
+  return {
+    status: "unexpected-failure",
+    code,
+    message: errorMessage(error),
+  };
+}
+
+/**
+ * Prove the migration boundary directly:
+ *
+ * 1. explicit v1 with a deliberately low cap must fail PLAN_TOO_LARGE;
+ * 2. explicit v2 must still run to completion for the same prepared fixture.
+ *
+ * Unlike semantic parity mode, this API does not compare v1/v2 output because
+ * the expected v1 run never produces output. Its durable report records both
+ * the typed failure and the fully analyzed v2 success.
+ */
+export async function runPlanV2SizePressure(
+  options: RunPlanV2SizePressureOptions,
+): Promise<PlanV2SizePressureReport> {
+  if (!existsSync(options.fixtureDir)) {
+    throw new Error(`plan parity fixture does not exist: ${options.fixtureDir}`);
+  }
+  mkdirSync(options.artifactsDir, { recursive: true });
+  const v1ProjectDir = resolve(options.artifactsDir, "v1-low-cap", "project");
+  const v2ProjectDir = resolve(options.artifactsDir, "v2", "project");
+  preparePlanParityFixture(options.fixtureDir, v1ProjectDir);
+  preparePlanParityFixture(options.fixtureDir, v2ProjectDir);
+
+  let v1: PlanTooLargeProbeOutcome;
+  try {
+    await options.driver.render({
+      protocol: "v1",
+      projectDir: v1ProjectDir,
+      outputDir: resolve(options.artifactsDir, "v1-low-cap", "run"),
+      renderConfig: options.renderConfig,
+      planSizeCapBytes: options.v1PlanSizeCapBytes,
+    });
+    v1 = {
+      status: "unexpected-success",
+      message: `v1 rendered despite plan cap ${options.v1PlanSizeCapBytes}`,
+    };
+  } catch (error) {
+    v1 = classifyPlanTooLargeProbeFailure(error);
+  }
+
+  let v2: PlanV2PressureOutcome;
+  try {
+    const result = await options.driver.render({
+      protocol: "v2",
+      projectDir: v2ProjectDir,
+      outputDir: resolve(options.artifactsDir, "v2", "run"),
+      renderConfig: options.renderConfig,
+    });
+    const analyze = options.analyzeDriverResult ?? analyzePlanParityDriverResult;
+    v2 = {
+      status: "success",
+      measurement: await analyze(options.driver.name, result),
+    };
+  } catch (error) {
+    v2 = {
+      status: "failure",
+      message: errorMessage(error),
+    };
+  }
+
+  const checks: PlanV2SizePressureReport["checks"] = [
+    {
+      name: "v1-plan-too-large",
+      passed: v1.status === "expected-failure",
+      detail:
+        v1.status === "expected-failure"
+          ? `PLAN_TOO_LARGE size=${v1.sizeBytes ?? "unknown"} limit=${v1.limitBytes ?? "unknown"}`
+          : v1.message,
+    },
+    {
+      name: "v2-render-success",
+      passed: v2.status === "success",
+      detail:
+        v2.status === "success"
+          ? `${v2.measurement.media.frameSha256.length} frames, ${v2.measurement.media.outputBytes} output bytes`
+          : v2.message,
+    },
+  ];
+  const report: PlanV2SizePressureReport = {
+    passed: checks.every((entry) => entry.passed),
+    checks,
+    v1,
+    v2,
+  };
+  writeFileSync(
+    resolve(options.artifactsDir, "plan-too-large-v2-report.json"),
+    `${JSON.stringify(report, null, 2)}\n`,
+    "utf-8",
+  );
+  return report;
+}
+
+/**
+ * Run the same prepared project through explicit v1 and v2 drivers, analyze
+ * their artifacts, and persist a machine-readable comparison report.
+ */
+export async function runPlanProtocolParity(
+  options: RunPlanProtocolParityOptions,
+): Promise<PlanParityComparison> {
+  if (!existsSync(options.fixtureDir)) {
+    throw new Error(`plan parity fixture does not exist: ${options.fixtureDir}`);
+  }
+  mkdirSync(options.artifactsDir, { recursive: true });
+
+  const v1ProjectDir = resolve(options.artifactsDir, "v1", "project");
+  const v2ProjectDir = resolve(options.artifactsDir, "v2", "project");
+  preparePlanParityFixture(options.fixtureDir, v1ProjectDir);
+  preparePlanParityFixture(options.fixtureDir, v2ProjectDir);
+
+  const v1Result = await options.v1Driver.render({
+    protocol: "v1",
+    projectDir: v1ProjectDir,
+    outputDir: resolve(options.artifactsDir, "v1", "run"),
+    renderConfig: options.renderConfig,
+    planSizeCapBytes: options.v1PlanSizeCapBytes,
+  });
+  const v2Result = await options.v2Driver.render({
+    protocol: "v2",
+    projectDir: v2ProjectDir,
+    outputDir: resolve(options.artifactsDir, "v2", "run"),
+    renderConfig: options.renderConfig,
+  });
+  const [v1, v2] = await Promise.all([
+    analyzePlanParityDriverResult(options.v1Driver.name, v1Result),
+    analyzePlanParityDriverResult(options.v2Driver.name, v2Result),
+  ]);
+  const comparison = comparePlanParityMeasurements(v1, v2, options.comparison);
+  writeFileSync(
+    resolve(options.artifactsDir, "comparison.json"),
+    `${JSON.stringify(comparison, null, 2)}\n`,
+    "utf-8",
+  );
+  return comparison;
+}
+
+interface LambdaLocalDriverModule {
+  createLambdaLocalPlanParityDriver(): PlanParityDriver;
+}
+
+function isLambdaLocalDriverModule(value: unknown): value is LambdaLocalDriverModule {
+  return (
+    typeof value === "object" &&
+    value !== null &&
+    "createLambdaLocalPlanParityDriver" in value &&
+    typeof value.createLambdaLocalPlanParityDriver === "function"
+  );
+}
+
+async function loadDriver(target: PlanParityTarget): Promise<PlanParityDriver> {
+  if (target.startsWith("aws:")) {
+    throw new Error(
+      `plan parity target ${target} requires the deployed-AWS driver package; ` +
+        "use the library API to inject that driver until it is installed",
+    );
+  }
+  // Indirect path keeps producer's build from pulling @hyperframes/aws-lambda
+  // into its declaration emit before that workspace package has built.
+  const modulePath = "./plan-parity-lambda-local-driver.js";
+  const loaded: unknown = await import(modulePath);
+  if (!isLambdaLocalDriverModule(loaded)) {
+    throw new Error("lambda-local parity driver module has an invalid shape");
+  }
+  return loaded.createLambdaLocalPlanParityDriver();
+}
+
+async function main(): Promise<void> {
+  const options = parsePlanParityArgs(process.argv);
+  if (options.expectV1PlanTooLarge) {
+    if (options.v1PlanSizeCapBytes === undefined) {
+      throw new Error("plan parity: --expect-v1-plan-too-large requires --v1-plan-size-cap-bytes");
+    }
+    if (options.v1Target !== options.v2Target) {
+      throw new Error(
+        "plan parity: pressure mode requires the same target for its v1 probe and v2 proof",
+      );
+    }
+    const report = await runPlanV2SizePressure({
+      fixtureDir: options.fixtureDir,
+      artifactsDir: options.artifactsDir,
+      driver: await loadDriver(options.v1Target),
+      renderConfig: options.renderConfig,
+      v1PlanSizeCapBytes: options.v1PlanSizeCapBytes,
+    });
+    process.stdout.write(`${JSON.stringify(report, null, 2)}\n`);
+    if (!report.passed) process.exitCode = 1;
+    return;
+  }
+  const comparison = await runPlanProtocolParity({
+    fixtureDir: options.fixtureDir,
+    artifactsDir: options.artifactsDir,
+    v1Driver: await loadDriver(options.v1Target),
+    v2Driver: await loadDriver(options.v2Target),
+    renderConfig: options.renderConfig,
+    v1PlanSizeCapBytes: options.v1PlanSizeCapBytes,
+    comparison: options.comparison,
+  });
+  process.stdout.write(`${JSON.stringify(comparison, null, 2)}\n`);
+  if (!comparison.passed) process.exitCode = 1;
+}
+
+const isDirectRun =
+  process.argv[1] !== undefined &&
+  resolve(process.argv[1]) === resolve(new URL(import.meta.url).pathname);
+if (isDirectRun) {
+  await main();
+}
diff --git a/packages/producer/src/plan-parity-lambda-local-driver.ts b/packages/producer/src/plan-parity-lambda-local-driver.ts
new file mode 100644
index 000000000..62a4038f0
--- /dev/null
+++ b/packages/producer/src/plan-parity-lambda-local-driver.ts
@@ -0,0 +1,40 @@
+// fallow-ignore-file unused-file
+// Loaded by a runtime-only dynamic import so producer declaration emit does
+// not eagerly resolve the AWS workspace package.
+/**
+ * Lambda-local adapter for the generic v1/v2 parity runner.
+ *
+ * Kept separate from the protocol-neutral harness because it imports
+ * `@hyperframes/aws-lambda`; producer's declaration emit runs before the
+ * Lambda workspace package is built in some CI stages.
+ */
+
+import { existsSync, mkdirSync, rmSync } from "node:fs";
+import { join } from "node:path";
+import type { PlanParityDriver } from "./plan-parity-contract.js";
+import { runLambdaLocalRender } from "./regression-harness-lambda-local.js";
+
+export function createLambdaLocalPlanParityDriver(): PlanParityDriver {
+  return {
+    name: "lambda-local",
+    async render(input) {
+      if (existsSync(input.outputDir)) {
+        rmSync(input.outputDir, { recursive: true, force: true });
+      }
+      mkdirSync(input.outputDir, { recursive: true });
+      return runLambdaLocalRender({
+        protocol: input.protocol,
+        projectDir: input.projectDir,
+        tempRoot: input.outputDir,
+        renderedOutputPath: join(input.outputDir, "output.mp4"),
+        fps: input.renderConfig.fps,
+        width: input.renderConfig.width,
+        height: input.renderConfig.height,
+        format: input.renderConfig.format,
+        chunkSize: input.renderConfig.chunkSize,
+        maxParallelChunks: input.renderConfig.maxParallelChunks,
+        planDirSizeLimitBytes: input.planSizeCapBytes,
+      });
+    },
+  };
+}
diff --git a/packages/producer/src/regression-harness-lambda-local-types.ts b/packages/producer/src/regression-harness-lambda-local-types.ts
index 528bfb9d4..157954715 100644
--- a/packages/producer/src/regression-harness-lambda-local-types.ts
+++ b/packages/producer/src/regression-harness-lambda-local-types.ts
@@ -13,6 +13,8 @@ import type { DistributedFormat } from "./services/distributed/shared.js";
 
 /** Inputs for {@link runLambdaLocalRender}. Same contract as `runDistributedSimulatedRender`. */
 export interface RunLambdaLocalInput {
+  /** Explicit plan transport. Omitted only for legacy regression callers, where it defaults to v1. */
+  protocol?: "v1" | "v2";
   projectDir: string;
   tempRoot: string;
   renderedOutputPath: string;
@@ -32,8 +34,25 @@ export interface RunLambdaLocalInput {
   codec?: "h264" | "h265";
   chunkSize?: number;
   maxParallelChunks?: number;
+  /** Test-only low cap for exercising typed v1 PLAN_TOO_LARGE behavior. */
+  planDirSizeLimitBytes?: number;
   variables?: Record<string, unknown>;
 }
 
+export interface LambdaLocalRenderResult {
+  protocol: "v1" | "v2";
+  outputPath: string;
+  chunks: Array<{
+    index: number;
+    path: string;
+    reportedSha256: string;
+  }>;
+  transferBytes: {
+    downloaded: number;
+    uploaded: number;
+  };
+  peakMaterializedBytes: number;
+}
+
 /** Public signature of the dynamically-loaded `runLambdaLocalRender`. */
-export type RunLambdaLocalRender = (input: RunLambdaLocalInput) => Promise<void>;
+export type RunLambdaLocalRender = (input: RunLambdaLocalInput) => Promise<LambdaLocalRenderResult>;
diff --git a/packages/producer/src/regression-harness-lambda-local.ts b/packages/producer/src/regression-harness-lambda-local.ts
index caf124a43..88a2da412 100644
--- a/packages/producer/src/regression-harness-lambda-local.ts
+++ b/packages/producer/src/regression-harness-lambda-local.ts
@@ -26,6 +26,7 @@ import {
   createWriteStream,
   existsSync,
   mkdirSync,
+  readdirSync,
   readFileSync,
   statSync,
   writeFileSync,
@@ -37,7 +38,6 @@ import { downloadS3ObjectToFile, tarDirectory, untarDirectory } from "@hyperfram
 import { handler } from "@hyperframes/aws-lambda/handler";
 import type {
   AssembleEvent,
-  AssembleLambdaResult,
   HandlerDeps,
   PlanEvent,
   PlanLambdaResult,
@@ -46,8 +46,14 @@ import type {
   SerializableDistributedRenderConfig,
 } from "@hyperframes/aws-lambda";
 
-export type { RunLambdaLocalInput } from "./regression-harness-lambda-local-types.js";
-import type { RunLambdaLocalInput } from "./regression-harness-lambda-local-types.js";
+export type {
+  LambdaLocalRenderResult,
+  RunLambdaLocalInput,
+} from "./regression-harness-lambda-local-types.js";
+import type {
+  LambdaLocalRenderResult,
+  RunLambdaLocalInput,
+} from "./regression-harness-lambda-local-types.js";
 
 const FAKE_BUCKET = "harness-lambda-local";
 
@@ -60,7 +66,10 @@ function uri(key: string): string {
  * Run plan → renderChunk × N → assemble through the OSS handler with a
  * filesystem-backed fake S3. Output lands at `input.renderedOutputPath`.
  */
-export async function runLambdaLocalRender(input: RunLambdaLocalInput): Promise<void> {
+export async function runLambdaLocalRender(
+  input: RunLambdaLocalInput,
+): Promise<LambdaLocalRenderResult> {
+  const protocol = input.protocol ?? "v1";
   const s3Root = join(input.tempRoot, "s3");
   mkdirSync(s3Root, { recursive: true });
 
@@ -81,7 +90,26 @@ export async function runLambdaLocalRender(input: RunLambdaLocalInput): Promise<
     skipChromeResolution: true,
     tmpRoot: join(input.tempRoot, "lambda-tmp"),
   };
-  mkdirSync(deps.tmpRoot as string, { recursive: true });
+  const lambdaTmpRoot = join(input.tempRoot, "lambda-tmp");
+  mkdirSync(lambdaTmpRoot, { recursive: true });
+  let peakObservedMaterializedBytes = measureDirectoryBytes(lambdaTmpRoot);
+  const observe = async <Result>(operation: () => Promise<Result>): Promise<Result> => {
+    const sample = (): void => {
+      peakObservedMaterializedBytes = Math.max(
+        peakObservedMaterializedBytes,
+        measureDirectoryBytes(lambdaTmpRoot),
+      );
+    };
+    sample();
+    const timer = setInterval(sample, 2);
+    timer.unref();
+    try {
+      return await operation();
+    } finally {
+      clearInterval(timer);
+      sample();
+    }
+  };
 
   const config: SerializableDistributedRenderConfig = {
     fps: input.fps,
@@ -91,6 +119,7 @@ export async function runLambdaLocalRender(input: RunLambdaLocalInput): Promise<
     ...(input.format === "mp4" && input.codec !== undefined ? { codec: input.codec } : {}),
     chunkSize: input.chunkSize,
     maxParallelChunks: input.maxParallelChunks,
+    planDirSizeLimitBytes: input.planDirSizeLimitBytes,
     hdrMode: "force-sdr",
     // Forward `variables` through the event boundary so lambda-local mode
     // exercises the same variables-in-encoder.json path that real Lambda
@@ -101,42 +130,95 @@ export async function runLambdaLocalRender(input: RunLambdaLocalInput): Promise<
 
   // STEP A: plan
   const planPrefix = `renders/harness/${Date.now()}/`;
-  const planEvent: PlanEvent = {
-    Action: "plan",
-    ProjectS3Uri: uri(projectKey),
-    PlanOutputS3Prefix: uri(planPrefix),
-    Config: config,
-  };
-  const planResult = (await handler(planEvent, deps)) as PlanLambdaResult;
+  const planEvent: PlanEvent =
+    protocol === "v2"
+      ? {
+          Action: "plan",
+          PlanProtocol: "v2",
+          ProjectS3Uri: uri(projectKey),
+          PlanOutputS3Prefix: uri(planPrefix),
+          Config: config,
+        }
+      : {
+          Action: "plan",
+          PlanProtocol: "v1",
+          ProjectS3Uri: uri(projectKey),
+          PlanOutputS3Prefix: uri(planPrefix),
+          Config: config,
+        };
+  const planResponse = await observe(() => handler(planEvent, deps));
+  if (planResponse.Action !== "plan") {
+    throw new Error(`lambda-local: plan action returned ${planResponse.Action}`);
+  }
+  const planResult: PlanLambdaResult = planResponse;
 
   // STEP B: render every chunk through the handler.
   const chunkUris: string[] = [];
+  const chunks: LambdaLocalRenderResult["chunks"] = [];
   for (let i = 0; i < planResult.ChunkCount; i++) {
-    const chunkEvent: RenderChunkEvent = {
-      Action: "renderChunk",
-      PlanS3Uri: planResult.PlanS3Uri,
+    const shared = {
+      Action: "renderChunk" as const,
       PlanHash: planResult.PlanHash,
       ChunkIndex: i,
       ChunkOutputS3Prefix: uri(planPrefix),
       Format: input.format,
     };
-    const chunkResult = (await handler(chunkEvent, deps)) as RenderChunkLambdaResult;
+    const chunkEvent: RenderChunkEvent =
+      protocol === "v2"
+        ? {
+            ...shared,
+            PlanProtocol: "v2",
+            PlanV2ManifestS3Uri: requireV2PlanResult(planResult).PlanV2ManifestS3Uri,
+            PlanV2ArtifactS3Prefix: requireV2PlanResult(planResult).PlanV2ArtifactS3Prefix,
+          }
+        : {
+            ...shared,
+            PlanProtocol: "v1",
+            PlanS3Uri: requireV1PlanResult(planResult).PlanS3Uri,
+          };
+    const chunkResponse = await observe(() => handler(chunkEvent, deps));
+    if (chunkResponse.Action !== "renderChunk") {
+      throw new Error(`lambda-local: renderChunk action returned ${chunkResponse.Action}`);
+    }
+    const chunkResult: RenderChunkLambdaResult = chunkResponse;
     chunkUris.push(chunkResult.ChunkS3Uri);
+    chunks.push({
+      index: i,
+      path: fakeS3Path(s3Root, chunkResult.ChunkS3Uri),
+      reportedSha256: chunkResult.Sha256,
+    });
   }
 
   // STEP C: assemble
   const finalUri = uri(
     `${planPrefix}output${input.format === "png-sequence" ? ".tar.gz" : `.${input.format}`}`,
   );
-  const assembleEvent: AssembleEvent = {
-    Action: "assemble",
-    PlanS3Uri: planResult.PlanS3Uri,
+  const assembleShared = {
+    Action: "assemble" as const,
     ChunkS3Uris: chunkUris,
     AudioS3Uri: planResult.AudioS3Uri,
     OutputS3Uri: finalUri,
     Format: input.format,
   };
-  (await handler(assembleEvent, deps)) as AssembleLambdaResult;
+  const assembleEvent: AssembleEvent =
+    protocol === "v2"
+      ? {
+          ...assembleShared,
+          PlanProtocol: "v2",
+          PlanV2ManifestS3Uri: requireV2PlanResult(planResult).PlanV2ManifestS3Uri,
+          PlanV2ArtifactS3Prefix: requireV2PlanResult(planResult).PlanV2ArtifactS3Prefix,
+          PlanHash: planResult.PlanHash,
+        }
+      : {
+          ...assembleShared,
+          PlanProtocol: "v1",
+          PlanS3Uri: requireV1PlanResult(planResult).PlanS3Uri,
+        };
+  const assembleResponse = await observe(() => handler(assembleEvent, deps));
+  if (assembleResponse.Action !== "assemble") {
+    throw new Error(`lambda-local: assemble action returned ${assembleResponse.Action}`);
+  }
+  const transferBytes = fakeS3.transferBytes;
 
   // Copy the final output from fake-S3 land back out to the path the
   // harness expects. For png-sequence, untar into the dir.
@@ -152,6 +234,57 @@ export async function runLambdaLocalRender(input: RunLambdaLocalInput): Promise<
       input.renderedOutputPath,
     );
   }
+
+  return {
+    protocol,
+    outputPath: input.renderedOutputPath,
+    chunks,
+    transferBytes,
+    peakMaterializedBytes: peakObservedMaterializedBytes,
+  };
+}
+
+function fakeS3Path(s3Root: string, s3Uri: string): string {
+  const prefix = `s3://${FAKE_BUCKET}/`;
+  if (!s3Uri.startsWith(prefix)) {
+    throw new Error(`lambda-local: unexpected fake S3 URI ${s3Uri}`);
+  }
+  return join(s3Root, s3Uri.slice(prefix.length));
+}
+
+function requireV1PlanResult(
+  result: PlanLambdaResult,
+): Extract<PlanLambdaResult, { PlanS3Uri: string }> {
+  if (!("PlanS3Uri" in result)) {
+    throw new Error("lambda-local: v1 plan returned v2 locators");
+  }
+  return result;
+}
+
+function requireV2PlanResult(
+  result: PlanLambdaResult,
+): Extract<PlanLambdaResult, { PlanProtocol: "v2" }> {
+  if (!("PlanProtocol" in result) || result.PlanProtocol !== "v2") {
+    throw new Error("lambda-local: v2 plan did not return explicit v2 locators");
+  }
+  return result;
+}
+
+// The recursive walk is the measurement itself; extracting its two filesystem
+// branches would make this small test-harness utility harder to audit.
+// fallow-ignore-next-line complexity
+function measureDirectoryBytes(path: string): number {
+  if (!existsSync(path)) return 0;
+  let bytes = 0;
+  for (const entry of readdirSync(path, { withFileTypes: true })) {
+    const child = join(path, entry.name);
+    if (entry.isDirectory()) {
+      bytes += measureDirectoryBytes(child);
+    } else if (entry.isFile()) {
+      bytes += statSync(child).size;
+    }
+  }
+  return bytes;
 }
 
 /**
@@ -162,8 +295,19 @@ export async function runLambdaLocalRender(input: RunLambdaLocalInput): Promise<
  * without going through a real S3 endpoint.
  */
 class FilesystemBackedFakeS3 {
+  private downloadedBytes = 0;
+  private uploadedBytes = 0;
+  private readonly metadata = new Map<string, Record<string, string>>();
+
   constructor(private readonly root: string) {}
 
+  get transferBytes(): { downloaded: number; uploaded: number } {
+    return {
+      downloaded: this.downloadedBytes,
+      uploaded: this.uploadedBytes,
+    };
+  }
+
   async send(command: unknown): Promise<unknown> {
     const cmdName = (command as { constructor: { name: string } }).constructor.name;
     const input = (command as { input: { Bucket: string; Key: string; Body?: unknown } }).input;
@@ -180,6 +324,7 @@ class FilesystemBackedFakeS3 {
         throw err;
       }
       const bytes = readFileSync(fsPath);
+      this.downloadedBytes += bytes.length;
       return { Body: Readable.from([bytes]) };
     }
     if (cmdName === "PutObjectCommand") {
@@ -192,7 +337,11 @@ class FilesystemBackedFakeS3 {
       } else {
         throw new Error(`FakeS3: PutObject body shape not supported (${typeof body})`);
       }
-      return { ETag: `"fake-${statSync(fsPath).size}"` };
+      const size = statSync(fsPath).size;
+      this.uploadedBytes += size;
+      const metadata = (command as { input: { Metadata?: Record<string, string> } }).input.Metadata;
+      if (metadata) this.metadata.set(input.Key, metadata);
+      return { ETag: `"fake-${size}"` };
     }
     if (cmdName === "HeadObjectCommand") {
       if (!existsSync(fsPath)) {
@@ -204,7 +353,11 @@ class FilesystemBackedFakeS3 {
         err.$metadata = { httpStatusCode: 404 };
         throw err;
       }
-      return { ContentLength: statSync(fsPath).size, LastModified: new Date() };
+      return {
+        ContentLength: statSync(fsPath).size,
+        LastModified: new Date(),
+        Metadata: this.metadata.get(input.Key),
+      };
     }
     throw new Error(`FakeS3: unexpected command ${cmdName}`);
   }
diff --git a/packages/producer/tsconfig.json b/packages/producer/tsconfig.json
index 4e876a30f..f63915cad 100644
--- a/packages/producer/tsconfig.json
+++ b/packages/producer/tsconfig.json
@@ -25,6 +25,7 @@
     "dist",
     "src/**/*.test.ts",
     "src/**/__test_utils__/**",
-    "src/regression-harness-lambda-local.ts"
+    "src/regression-harness-lambda-local.ts",
+    "src/plan-parity-lambda-local-driver.ts"
   ]
 }