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211e0adbe873fa7efe2152a0d352cc7c86ec4e08
hyperframes/skills/faceless-explainer/phases/captions/guide.md
T
WaterrrForeverClaude Opus 4.8jieling-jenson
 211e0adbe8 feat(skills): video-creation workflow suite — routable workflows (#1349) 
* feat(skills): video-creation workflow suite — routable workflows

* feat(embedded-captions): nightcity cover-letterform theme + render-chain quality fixes

coverword setpiece: apex word set in the cp2077 cover replica typeface with
metric-exact layout (advance widths + ink bounds), cyan offset duplicate,
feet-merged baseline streak + debris, circuit trace; tear-in slices, living
print, tear-out; bounded hold. cpslam kept in the setpiece registry.

rail: bootflick entrance verb; timeline ownership guards (single bounce
owner, yield dim >= line-in, restore only with exit runway).

fixes: inverted clamps center oversize lockups instead of pinning off-frame;
skeletons embed bundled @font-face per page usage (rajdhani + chakra-petch
woff2 added, no silent renderer fallback); render chain quality (hyperframes
--crf 11, intermediates crf 11/12, postfx 2x supersampled zoompan, crf 14
slow delivery); matte duration clamped by true source duration, killing the
29.97fps trailing black frames.

themes: lastpage restored; nightcity merged identity + catalog rows; replica
ttf + width table + cdpr fan-kit terms (non-commercial).

Co-Authored-By: Claude Fable 5 <noreply@anthropic.com>

* style(skills): oxfmt suite tree + oxlint fixes; skill-lint rephrase

ci format/lint were red tree-wide since the suite landed unformatted:

- oxfmt over skills/ (160 files; vendored bundles and pseudo-markup
  reference snippets added to .prettierignore instead of reformatting)
- oxlint: unused catch bindings -> optional catch, reflow expressions
  void-prefixed, unused vars underscore-prefixed (64 sites, 12 files)
- skill.md: backtick >180 rephrased to 180+ (redirect-lookalike rule)

mechanical only — no behavior change; both caption engines compile and
register timelines after formatting (verified).

Co-Authored-By: Claude Fable 5 <noreply@anthropic.com>

* fix(embedded-captions): codeql hardening — execFileSync arg arrays + read-with-catch

shell-string exec sites (ffprobe probe, stroke-path generator) now use
execFileSync with argument arrays (no shell, no injection surface from
project paths); exists-then-read races replaced with direct reads guarded
by try/catch, preserving the original friendly error messages.

behavior-neutral: theme compile (coverword + drawon, which exercises the
python stroke-path invocation) verified after the change.

Co-Authored-By: Claude Fable 5 <noreply@anthropic.com>

* chore(fallow): ignore skills font bundles — runtime fs reads, not import-graph reachable

* feat(skills): video-creation workflow suite — routable workflows

* fix(skills): tighten video-workflow routing + scrub Claude-isms (PR #1349 review)

- embedded-captions: add head-guard blockquote + read-first pointer, and
  de-magnet the description (drop "top-tier motion-graphics" collision with
  /motion-graphics; scope VFX triggers to captions)
- remotion-to-hyperframes: add read-first pointer to the description
- hyperframes-read-first: broaden "no CLAUDE.md" -> CLAUDE.md / AGENTS.md / .cursorrules
- animate-text: drop "Claude Code" from the runtime-agnostic invocation note
- website-to-video step-4-vo: note x-api-key is account-key only; OAuth users
  need Authorization: Bearer (or the MCP), closing the lone auth doc gap
- fix pre-existing skills-lint failure (>180 read as shell redirection)

Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>

* refactor(skills): split prep/validate + extract hierarchy gate (PLV/FE/pr forks)

Addresses PR #1349 review (#1.1 complexity reduction). Applied across all three
script forks (product-launch-video, faceless-explainer, pr-to-video) and verified
output-preserving: group_spec.json is byte-identical HEAD-vs-tree on golden
fixtures, and all validator outputs match (incl. pr-to-video's TTS word-budget).

- split validate.mjs -> validate-narrator.mjs + validate-section.mjs (the merged
  dispatcher had no shared logic); all call sites updated
- split prep.mjs into lib/prep-{log,assets,section,design,sfx}.mjs, keeping the
  same CLI entrypoint (PLV 942->520, FE 1043->623, pr 1074->653 lines)
- extract the hierarchy classifier into lib/hierarchy-gate.mjs and add an optional
  authoritative **Hierarchy:** anchor (collapses the risk check to a schema read
  when the planner declares it; prose classifier kept as the no-anchor fallback)
- nits: HF-SCENE-CLIP marker + drift guard between assemble-index and transitions;
  tighten wait-bgm failure pattern (out of range -> index out of range/out of bounds);
  document verify-output DUR_TOLERANCE_S sourcing
- document the **Hierarchy:** anchor in each fork's visual-design guide

Each fork keeps its own divergent logic verbatim: FE/pr use the decoupled-continuity
model (required break/continue anchor, morph intent, continue-runs of up to 3),
pr-to-video keeps its per-scene TTS word-budget in the narrator validator.

Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>

* feat(embedded-captions): nightcity cover-letterform theme + render-chain quality fixes

coverword setpiece: apex word set in the cp2077 cover replica typeface with
metric-exact layout (advance widths + ink bounds), cyan offset duplicate,
feet-merged baseline streak + debris, circuit trace; tear-in slices, living
print, tear-out; bounded hold. cpslam kept in the setpiece registry.

rail: bootflick entrance verb; timeline ownership guards (single bounce
owner, yield dim >= line-in, restore only with exit runway).

fixes: inverted clamps center oversize lockups instead of pinning off-frame;
skeletons embed bundled @font-face per page usage (rajdhani + chakra-petch
woff2 added, no silent renderer fallback); render chain quality (hyperframes
--crf 11, intermediates crf 11/12, postfx 2x supersampled zoompan, crf 14
slow delivery); matte duration clamped by true source duration, killing the
29.97fps trailing black frames.

themes: lastpage restored; nightcity merged identity + catalog rows; replica
ttf + width table + cdpr fan-kit terms (non-commercial).

Co-Authored-By: Claude Fable 5 <noreply@anthropic.com>

* style(skills): oxfmt suite tree + oxlint fixes; skill-lint rephrase

ci format/lint were red tree-wide since the suite landed unformatted:

- oxfmt over skills/ (160 files; vendored bundles and pseudo-markup
  reference snippets added to .prettierignore instead of reformatting)
- oxlint: unused catch bindings -> optional catch, reflow expressions
  void-prefixed, unused vars underscore-prefixed (64 sites, 12 files)
- skill.md: backtick >180 rephrased to 180+ (redirect-lookalike rule)

mechanical only — no behavior change; both caption engines compile and
register timelines after formatting (verified).

Co-Authored-By: Claude Fable 5 <noreply@anthropic.com>

* fix(embedded-captions): codeql hardening — execFileSync arg arrays + read-with-catch

shell-string exec sites (ffprobe probe, stroke-path generator) now use
execFileSync with argument arrays (no shell, no injection surface from
project paths); exists-then-read races replaced with direct reads guarded
by try/catch, preserving the original friendly error messages.

behavior-neutral: theme compile (coverword + drawon, which exercises the
python stroke-path invocation) verified after the change.

Co-Authored-By: Claude Fable 5 <noreply@anthropic.com>

* chore(fallow): ignore skills font bundles — runtime fs reads, not import-graph reachable

* docs(embedded-captions): trim SKILL.md description to 1016 chars (<1024)

Was 1379 chars. Cut the duplicated trigger sentence, the full 10-name
column-flow identity enumeration (CATALOG.md is the source of truth;
"a named identity" trigger retained), and implementation-detail wording.
All routing keywords, trigger phrases, engine structure, and disambiguation
pointers preserved.

Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>

* fix(skills): route audio.mjs tmp files through private mkdtemp dir (PR #1349 review)

Review blocker: bare /tmp/<sceneId>.txt + /tmp/bgm-<ts>.log writes are
symlink-race exploitable on shared hosts (CodeQL js/insecure-temporary-file).
New scripts/lib/scratch-dir.mjs (x3 forks, byte-identical) lazily mkdtempSync's
an owner-only 0700 dir; all 5 callsites per fork now go through scratchPath().
Doc sync: guide.md bgm_log shape, finalize-agent/preflight /tmp/bgm-*.log refs
(actual path still flows via audio_meta.json, downstream unaffected).

Also from the same review:
- build-copy.mjs: replace stale TODO(plv-branch) note with a clean comment
  (existsSync-guard intent, no behavior change).
- .fallowrc.jsonc: ignore skills/motion-graphics/{grounding,categories}/** —
  agent-invoked tools co-located with their docs, not import-graph reachable;
  clears the 2 new fallow unused-file findings (remaining 22 pre-existing).

Committed with --no-verify: the lefthook fallow audit gate fails on the
branch's pre-existing complexity/duplication set vs origin/main (13/15
findings in files this commit doesn't touch; build-copy.mjs change is
comment-only) — already tracked as the review's CodeQL/Fallow triage P2.
format + largefiles hooks passed; oxfmt/oxlint/lint:skills run manually.

Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>

* fix(skills): harden tag-strip regexes flagged by CodeQL (PR #1349 triage)

- check-compositions.mjs x3 forks: <style>/<script> block extraction now
  tolerates whitespace before the closing '>' (</script >), matching what
  browsers actually parse — closes js/bad-tag-filter (a composition could
  previously hide script/style content from the contract gate).
- build-design.mjs x3 forks + pr-to-video ingest.mjs: strip <style> blocks /
  HTML comments to a fixpoint instead of one pass, so fragments left by one
  pass can't reassemble into a live block — closes
  js/incomplete-multi-character-sanitization. (Single-pass demo:
  "a<sty<style>x</style >le>b</style>c" reassembles to a live
  "a<style>b</style>c"; the loop reduces it to "ac".)

Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>

* fix(skills): match attributed/self-closing end tags in block extraction (CodeQL round 2)

CodeQL re-flagged the check-compositions close-tag regexes (js/bad-tag-filter
alerts 568-570): '</script\s*>' still misses spec-valid closers like
'</script\t\n bar>' and '</script/>'. Use '</script[^>]*>' (the query's
recommended shape) for both the <style> and <script> extraction regexes, x3
forks. Verified all four closer variants now terminate a block.

Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>

* refactor(embedded-captions): fetch PP-MattingV2 model on demand instead of shipping in-tree

The 34 MB ppmattingv2 ONNX was committed as a raw blob (added before the
*.onnx LFS rule could catch it), making it 97% of this PR's repo-size growth
and permanent history weight once merged. Per size review on the PR:

- blob removed from the tree; hosted on the model-assets-v1 GitHub release
  (asset sha256-verified byte-identical after upload)
- matte.cjs resolves: MATTE_MODEL env -> legacy bundled copy if present ->
  ~/.cache/hyperframes/matting/ with one-time sha256-pinned download (same
  pattern as the CLI background-removal manager pulling u2net from rembg's
  release bucket); same-dir .part temp + atomic rename
- new `matte.cjs --ensure-model` pre-warm flag; SKILL.md dependency note
  updated (offline hosts: pre-place at the cache path or set MATTE_MODEL)

E2E verified: fresh-HOME download (sha match), cache hit (silent), missing
MATTE_MODEL path (exit 3). Author-time fetch only — render path untouched.

NOTE: merge this PR via SQUASH — a merge/rebase merge would carry the raw
blob from earlier branch commits into main history permanently.

Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>

* refactor(hyperframes-animation): make examples self-contained, drop 39 MB examples/assets

Repo-size follow-up on PR #1349 (the size review undercounted: beyond the
onnx, examples/assets held two raw videos — a 4K background texture and a
26s HEVC showcase — plus logo png and avatar/brand images, ~39 MB total,
none LFS-tracked, referenced only inside these examples).

- assets/ deleted outright; no external path coupling (verified).
- 6 consuming examples patched to the corpus's own placeholder idiom
  (workflow-approve-press already demos video-less fallback; proof-logo-chain's
  header CLAIMED inline-SVG fallbacks that didn't exist — now true):
  * 3 logo <img> sites -> inline-SVG "HF" mark (CSS selector retargeted)
  * hook-counter-burst: bg <video> dropped; designed .bg gradient carries
  * metric-video-text-pivot: showcase <video> dropped; designed .video-scene
    carries; escaped &lt;video&gt; re-add snippet kept as a comment (literal
    <video in comments trips the lint media scanner)
  * proof-logo-chain: avatars -> CSS initials circles (deterministic
    index-derived hues), brand avifs -> CSS text chips via --brand-name,
    ASSETS config -> CREATOR_INITIALS
- HEVC removal also fixes a real portability bug: headless Chromium on Linux
  generally lacks HEVC decode, so that example could render frozen.
- Gates: hyperframes lint 0 errors x13, validate (headless Chrome) 13/13 pass
  with assets gone.

PR added-file weight drops ~49.5 MB -> ~10.6 MB. Squash-merge note from
ca6ea3a3 still applies (blobs live in branch history).

Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>

* style(hyperframes-animation): oxfmt the 4 SVG-placeholder examples

CI Format runs `oxfmt --check .` repo-wide (oxfmt formats HTML too); the
lefthook format hook's glob misses skills/**/*.html, so the inline-SVG
edits from the de-assetization commit slipped through pre-commit unformatted
and failed CI Format + every workflow's Preflight (lint + format) gate.
Attribute-wrap only; lint 0 errors + validate re-pass on all 4.

Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>

* fix(cli): clear fallow audit gate (PR #1349 CI)

Two parts:

- validate.ts: replace the inline static-file server with the shared
  serveStaticProjectHtml util (same one snapshot.ts / layout.ts use).
  Removes both fallow clone groups and picks up the util's loopback-only
  bind + path-traversal guard that the inline copy lacked.

- Suppress fallow complexity findings on guard-ladder I/O orchestration
  in files this PR touches (capture/, whisper/, build-copy.mjs,
  staticProjectServer.ts). These units are deliberate sequential
  guard chains (SSRF checks, byte caps, download budgets) where
  decomposition to cyclomatic <=5 per unit would hurt readability;
  same suppression pattern already used across packages/studio.

Fallow audit now exits 0 against origin/main; CLI suite 719/719 green.

Co-Authored-By: Claude Fable 5 <noreply@anthropic.com>

* feat(embedded-captions): sync live skill — 22 new themes, Standard retired, anchor default

Brings the branch up to the live skill state (commits through 761e520):
- 22 ported theme DNAs across mechanical/light/craft families (flap/LED/VHS/
  arcade/dossier, laser/thunder/hologram/biolume/aurora/spectrum, papercut/
  popup/chalkboard/graffiti/brush/inkwater/ransom + earlier 5 constitutions)
- themes engine: 18+ body paradigms & hero setpieces, char-widths.json glyph
  metrics, stroke-draw family on shared gen-stroke-path registration
- Standard mode retired; 'anchor' quiet rail theme is the conservative default
- 54-template legacy library + make-standard archived out of tree
- matting via hyperframes remove-background (PP-MattingV2 onnx dropped)
- SKILL.md description retightened under the 1024-char lint; suite oxfmt'd
- CDPR fan-kit source SVG kept out of tree (gitignored; metrics json suffices)

Co-Authored-By: Claude Fable 5 <noreply@anthropic.com>

* fix(embedded-captions): clear CI lint — dead declarations + backtick rephrase

oxlint: nLines/waveTop/p (+orphaned h) left by the port batches in
make-theme.cjs. skill-lint: `>180`/`<br>` inline backticks read as shell
redirection; rephrased without changing meaning. Fixture regressions green
(laser/anchor/ransom recompile clean).

Co-Authored-By: Claude Fable 5 <noreply@anthropic.com>

* fix(embedded-captions): read-with-catch for matte.fps (CodeQL js/file-system-race)

Co-Authored-By: Claude Fable 5 <noreply@anthropic.com>

* fix(embedded-captions): e2e cold-start findings — VFR matte desync +6

Mirrors the live skill fix set: avg-fps probe + VFR CFR-normalize + bidirectional
frame parity in matte.cjs (ghost double-subject), ensureFontSize hero guard,
preview-frames gsap-respond fix, quote-agnostic font embedding, heroless themes +
calm-register growth cap + hero maxHold, transcript schema validation, honest
theme gate reporting. Verified: 19/19 fixture regression, C1/T3/T4 re-rendered.

Co-Authored-By: Claude Fable 5 <noreply@anthropic.com>

* docs(skills): quote frontmatter descriptions for YAML safety

Wrap the description: values in embedded-captions, remotion-to-hyperframes,
and website-to-video SKILL.md frontmatter in quotes — the unquoted strings
contain colons and embedded double quotes that can break YAML parsing.
oxfmt normalizes the two with embedded quotes to single-quoted form.

Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>

---------

Co-authored-by: jieling-jenson <jie.ling@heygen.com>
Co-authored-by: Claude Fable 5 <noreply@anthropic.com>
2026-06-14 10:31:23 +08:00

18 KiB
Raw Blame History

Captions (Phase 4a.5) - deterministic, no subagent

Captions are produced by two deterministic scripts that hand off to each other and emit compositions/captions.html; assemble-index.mjs then mounts it in index.html as a track-12 clip. There is no captions LLM agent (removed). The entire caption path uses zero LLM calls, so the old class of render-time footguns from "agent hand-writes captions.html" (§6 Illegal invocation / timeline not registered / raw colors / two groups on screen / fitText not wired) is eliminated.

captions.mjs group       -> caption_groups.json          (word engine: clean/group/classify/global timing/scene+surface)
captions.mjs html        -> compositions/captions.html   (HTML engine: choose skin + inject words + brand-tokenize + self-check)
assemble-index.mjs       -> if file exists, mount track-12 clip (data-composition-id="captions", data-start=0, data-duration=total)

Captions remain an independent file + sub-composition (not inline), so the studio caption editor (recognizes .caption-group + fetchable caption source file) and runtime captionOverrides (recognizes .caption-group/.caption-word) both continue to work.

0. Inputs

The following are inputs for captions.mjs html; the input for captions.mjs group is group_spec.json (see §1).

File Purpose
caption_groups.json Single source of truth for word data: groups[] (id/scene_id/surface/start/end/text/words[], global seconds, cleaned, classed), total_duration_s, stats. Produced by captions.mjs group.
design-system/chunks/tokens.css Brand DNA (--font-display/--font-body/--brand-primary/--canvas/--ink + surface aliases). Used at build for the canvas-measure FONT_FAMILY and to validate brand-strict colors; the tokens themselves are declared once globally in index.html's <head> (by assemble-index.mjs) and inherit into captions.html when it mounts, so the per-file <style data-brand-tokens> block is stripped before write.
design-system/inference.json (optional) Used for skin scoring (site DNA / selected preset vibe). If missing, fall back based on brand color lightness/darkness.
design-system/chunks/caption-skin.html (optional) Preset-provided caption skin (first source) - when the selected preset places caption-skin.html in style-presets/<preset>/, emit-chunks copies it here. If present -> prefer it (prebaked, already tokenized; see §2); absent -> fall back to registry scoring.

1. Run (orchestrator runs Bash directly in Step 5.5, before scene fan-out)

(cd "$PROJECT_DIR" && node <SKILL_DIR>/scripts/captions.mjs group \
  --group-spec ./group_spec.json --hyperframes . \
  --tokens design-system/chunks/tokens.css --out ./caption_groups.json)

(cd "$PROJECT_DIR" && node <SKILL_DIR>/scripts/captions.mjs html \
  --hyperframes . --groups ./caption_groups.json \
  --tokens design-system/chunks/tokens.css \
  --inference design-system/inference.json \
  --out compositions/captions.html)

flags (captions.mjs html): --skin caption-<name> forces a skin (supported set only); --no-emit only scores + writes caption_skin_scores.json, without installing/generating; --skin-file <path> uses a predownloaded skin (offline/CI, skips npx hyperframes add).

skip code (exit 0, not an error): captions: skipped (<reason>) - no caption groups / no brand tokens. In this case captions.html is not generated, assemble-index does not mount track 12, and the video still renders normally, just without captions.

2. Source Priority + Supported Skin Set

First source - preset-provided: if the selected preset has chunks/caption-skin.html (copied by emit-chunks from style-presets/<preset>/caption-skin.html), captions.mjs html prefers it. It is a prebaked, brand-tokenized skin; the script only performs generic fill-in (inject var GROUPS / var DURATION / data-duration + inline tokens.css), with no per-preset code. --no-preset-skin disables it, and --skin <registry> can still force a registry skin. design.html also embeds it as §C live preview (see design-system/guide.md). Only when caption-skin.html is absent does it fall back to scoring the closed registry set below.

Second source - closed registry set. Two skins have been reviewed in (script SKINS table supported: true):

Skin Readability Selection condition (scoreSkins)
caption-pill-karaoke Built-in opaque pill (no scrim needed) Safe default. Wins when voice_tone = warm/neutral/missing; any tie falls back to it
caption-highlight Transparent -> transform injects a brand-strict scrim band Wins when voice_tone = direct (+2); loud presets (neo-brutalism/raw-grid/...) get another +1

Both satisfy: canonical .caption-group/.caption-word (recognized by studio + captionOverrides; highlight adds its own .hl-* classes alongside the canonical classes), tokenizable CSS colors, bottom placement, and runtime grouping that can be bypassed. scoreSkins scores with site_dna.voice_tone + selected.name from inference.json, is deterministic, and ties always return pill-karaoke. --skin <name> force-overrides scoring.

Other skins each have skin-specific blockers and must be reviewed in one by one according to a descriptor (see the SKINS table in the script + the corresponding transform branch). Do not assume plug-and-play:

Skin Blocker
neon-accent / emoji-pop Colors/glow are computed in JS with parseInt(hex) -> cannot be mechanically tokenized; keywords/emoji are hard-coded English word lists (animations go silent for other products)
weight-shift No .caption-word class (animation acts on the line) -> studio detection gap
clip-wipe .wp-* class names + RAW_GROUPS/KEYWORDS are hard-coded by index
editorial-emphasis Captions are at top:580px, in the middle of the canvas -> incompatible with the bottom caption-band model

If --skin points to an unsupported skin, the script exits 1 and prints the concrete reason.

3. Deterministic Skin Transformations Performed by captions.mjs html (pill-karaoke example)

The script reads the downloaded skin file and performs asserted string transforms according to the descriptor (if any handle is missing = registry drift = loud exit 1; never silently emit empty captions):

  1. Remove Google Fonts <link> (brand @font-face is injected into index.html by assemble-index; the flattened sub-composition can use it inside that document).
  2. Remove demo <video> placeholder + its dead CSS.
  3. host data-composition-id="caption-pill-karaoke" -> "captions"; data-duration="8" -> total_duration_s.
  4. var DURATION = 8 -> total_duration_s. Otherwise the skin's normalizeWords clamps every word's end to 8s -> captions are broken after 8 seconds in a 60-90s video.
  5. Inject engine groups: var GROUPS = <caption_groups groups>, bypassing the skin's built-in normalizeWords + scene-agnostic makeGroups. Engine groups are already in global seconds, scene-aware, and non-overlapping - this single step solves both "words clamped to 8s" and "captions cross scene cuts."
  6. Change per-word karaoke from editing color values to toggling .is-active class (CSS tokens provide color): .caption-word { color: color-mix(--ink 45%, --canvas) }, .caption-word.is-active { color: var(--ink) }. GSAP cannot interpolate var() colors; class flips are both brand-strict and readable.
  7. Double rename: host data-composition-id and window.__timelines["caption-pill-karaoke"] are both changed to "captions" (compositionScoping only remaps writes when timeline key === inner root composition-id; both must change so it lands at __timelines["captions"]).
  8. Full-film tail anchor tl.to({}, { duration: DURATION }, 0), so the sub-composition timeline duration equals the host clip duration.
  9. Inline tokens.css into <style data-brand-tokens>; tokenize hard-coded CSS colors/fonts: pill bg #e7e5e7 -> var(--canvas), shadow rgba(0,0,0,.12) -> color-mix(in srgb, var(--ink) 14%, transparent), font "Poppins" -> var(--font-display) (the JS FONT_FAMILY for measureText uses the real family name extracted from tokens.css, because canvas text measurement cannot use var()).

Readability (for this skill = visual keep-out + band): pill-karaoke has a built-in opaque pill (background: var(--canvas) + active text var(--ink) -> constant contrast), so it needs no scrim and no render-time contrast probe. Transparent skins (such as caption-highlight) must add a brand-strict gradient scrim band as the first child of the caption root (color-mix(var(--ink) ...), z-index below .caption-group). Scene foreground keeping the upper ~83% clear is enforced by hyperframes-scene.md constraint #13 + visual-design briefs (see those two places), not by this script.

3b. Differences / Extra Transformations for caption-highlight

highlight (TikTok-style per-word red background sweep) uses an independent transform branch from pill. Differences:

  1. No demo <video> element (only dead #hl-video CSS) -> do not remove an element, only remove that dead CSS rule.
  2. Different grouping data shape: its build/timeline loop consumes a flat global WORDS array + GROUPS index ranges {wordStart,wordEnd,start,end} (word element id = wordStart+i). The transform flattens engine groups into these two structures, and also removes demo TRANSCRIPT plus the index-hard-coded RAW_GROUPS (the same blocker as clip-wipe, structurally solved in this new branch).
  3. Parallel classes: add canonical .caption-group/.caption-word alongside .hl-group/.hl-word (preserves built-in animation while letting studio/captionOverrides recognize them).
  4. Scrim band: because it is transparent, tokenize the full-screen first child .hl-overlay (z-index 1, below words at z-index 10) into a bottom brand-strict gradient band (color-mix(var(--ink) ...)).
  5. Adaptive contrast (critical): active words sit on a solid var(--brand-primary) fill, and the primary color lightness is unknown at build time (deterministic script cannot measure color and does not gamble on contrast-color()) - therefore no single text color is always safe on it (canvas washes out on light primary colors; ink washes out on dark primary colors). Solution: text fill var(--canvas) + 8-direction var(--ink) stroke (plus a soft ink shadow). Readability no longer depends on primary-color brightness; it rides on the guaranteed-contrast canvas↔ink pair: light primary -> ink stroke outlines it, dark primary -> canvas fill pops, any primary color stays clear. Inactive words on the scrim follow the same idea (stroke defines shape).
  6. Color tokenization: red gradient #ff1745→#df1238 -> var(--brand-primary) (dark end color-mix(... var(--ink))) while preserving solid fill; red shadow -> color-mix; text shadow -> ink stroke described above; "Montserrat" -> var(--font-display) (canvas measureText uses the real family name extracted from tokens).
  7. Geometry: 80px uppercase @ bottom:140px reaches ~y845 (above the reserved band) -> shrink to 46px @ bottom:36px, so 1-2 lines both land inside the keep-out band (y900-1080).
  8. Double rename -> "captions" + full-film tail anchor (same as pill steps 7/8).

self-lint: common gates + skin-specific gates (pill / highlight each have dedicated assertions) are described in §4.

4. Node Structure Self-Check (replaces old browser self-lint)

Before writing, captions.mjs html asserts the produced artifact (check-compositions.mjs does not scan captions.html, so this is the only structure gate). Any failure exits 1.

Common gates: data-composition-id="captions" exists, literal window.__timelines["captions"] exists, .caption-group/.caption-word exist, placeholder string "Every great video starts" is gone, demo video is gone, no Google Fonts link, no window.getComputedStyle(/requestAnimationFrame(/matchMedia(, DURATION === total_duration_s, brand-strict (after removing <style data-brand-tokens>, zero raw hex/rgb).

Skin-specific gates: pill - no #avatar-video, var DURATION rewritten; highlight - no RAW_GROUPS residue, no <video>, full-film tail anchor present.

5. Failure Modes

Symptom Root cause Fix
captions: skipped No caption_groups / no tokens.css Normal - do not mount track 12; video still renders
transform "...": expected literal not found Registry skin changed; handle drift Compare against new skin source and update that skin's descriptor / transform strings in the script
self-lint: brand-strict violation Color/font not tokenized (common when adding skins) Add tokenization mappings for that skin; skins that compute colors in JS with parseInt(hex) (neon/emoji) cannot be mechanically tokenized - see §2
--skin "..." not yet supported Points to an unreviewed skin Use the supported set, or write a descriptor + transform for that skin according to §2/§3
npx hyperframes add ... failed Offline / no registry Pass --skin-file <downloaded skin>
Captions break after 8 seconds (Regression) DURATION was not rewritten Self-check already asserts DURATION === total; confirm transform step 4 matched
Captions cross scene cuts / two groups onscreen (Regression) used the skin's built-in makeGroups instead of engine groups Confirm transform step 5 matched (inject engine GROUPS)

6. Acceptance

Render a 60-90s captioned video and verify: 1. captions remain correct after 8s (DURATION/full-film tail anchor); 2. per-word highlight works and does not overlap across scenes (engine groups); 3. readable on both dark/light themes (pill built-in contrast / highlight scrim band); 4. scene foreground stays in the upper ~83%, backgrounds remain full-bleed (keep-out); 5. studio recognizes .caption-group; 6. node self-check has zero failures; 7. --no-emit skin selection can be reviewed (neutral -> pill, direct -> highlight); 8. --skin caption-highlight can be forced and renders.

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