diff --git a/.claude-plugin/plugin.json b/.claude-plugin/plugin.json
index b96abd348..4ec11aa3a 100644
--- a/.claude-plugin/plugin.json
+++ b/.claude-plugin/plugin.json
@@ -1,7 +1,7 @@
 {
   "name": "hyperframes",
   "description": "HyperFrames by HeyGen. Write HTML, render video. Compositions, GSAP and runtime adapter animations, captions, voiceovers, audio-reactive visuals, and website-to-video capture for HyperFrames.",
-  "version": "0.6.114",
+  "version": "0.6.115",
   "author": {
     "name": "HeyGen",
     "email": "hyperframes@heygen.com",
diff --git a/.codex-plugin/plugin.json b/.codex-plugin/plugin.json
index 17dd35105..804196e01 100644
--- a/.codex-plugin/plugin.json
+++ b/.codex-plugin/plugin.json
@@ -1,6 +1,6 @@
 {
   "name": "hyperframes",
-  "version": "0.6.114",
+  "version": "0.6.115",
   "description": "Write HTML, render video. Compositions, Tailwind v4 styles, GSAP and runtime adapter animations, captions, voiceovers, audio-reactive visuals, and website-to-video capture for HyperFrames.",
   "author": {
     "name": "HeyGen",
diff --git a/.cursor-plugin/plugin.json b/.cursor-plugin/plugin.json
index 77ebcc28a..9b682ad8d 100644
--- a/.cursor-plugin/plugin.json
+++ b/.cursor-plugin/plugin.json
@@ -2,7 +2,7 @@
   "$schema": "https://cursor.com/schemas/cursor-plugin/plugin.json",
   "name": "hyperframes",
   "displayName": "HyperFrames by HeyGen",
-  "version": "0.6.114",
+  "version": "0.6.115",
   "description": "Write HTML, render video. Compositions, Tailwind v4 styles, GSAP and runtime adapter animations, captions, voiceovers, audio-reactive visuals, and website-to-video capture for HyperFrames.",
   "author": {
     "name": "HeyGen",
diff --git a/docs/changelog.mdx b/docs/changelog.mdx
index 573409a9b..e785de3f0 100644
--- a/docs/changelog.mdx
+++ b/docs/changelog.mdx
@@ -8,6 +8,54 @@ Recent HyperFrames releases, including user-facing features, fixes, and migratio
 
 {/* New release entries are prepended by `bun run changelog:draft <version> --write`. */}
 
+<Update
+  label="HyperFrames v0.6.115"
+  description="Released - 2026-06-20"
+  tags={["Release", "Slideshow", "Core", "Core,studio"]}
+>
+Full slideshow stack: schema, parser, controller, `<hyperframes-slideshow>` web component, presenter mode, branching editor panel, and `hyperframes present` CLI command. SDK gains element add/remove ops, elastic timing, keyframe writers, variables/brand model, and image-alpha hit-testing. Fixes cross-realm iframe media handling, per-element audio muting, querySelector injection, and DOM edit parity.
+
+## Features
+
+- **Studio:** Slideshow branching editor panel UI ([04a775b5](https://github.com/heygen-com/hyperframes/commit/04a775b58a2e0272d294b4e6f2c7b1f4aed794cb), [#1592](https://github.com/heygen-com/hyperframes/pull/1592))
+- **Studio:** Slideshow manifest persistence + panel helpers ([b74020fa](https://github.com/heygen-com/hyperframes/commit/b74020fa56ba4382d18f3ca23de349cf8c63e130), [#1591](https://github.com/heygen-com/hyperframes/pull/1591))
+- **Player:** \<hyperframes-slideshow\> web component + presenter ([075302cd](https://github.com/heygen-com/hyperframes/commit/075302cd0312e0c14f049d50f011c958140af540), [#1590](https://github.com/heygen-com/hyperframes/pull/1590))
+- **Player:** Slideshow controller state machine ([6938d6ac](https://github.com/heygen-com/hyperframes/commit/6938d6acf2d8ee9a4b01fe541f38a9a8b00dc0c6), [#1589](https://github.com/heygen-com/hyperframes/pull/1589))
+- **Studio:** Slideshow branching editor panel ([3861e8e9](https://github.com/heygen-com/hyperframes/commit/3861e8e9fc0f0b6660c31b3668bd71172aced38f), [#1582](https://github.com/heygen-com/hyperframes/pull/1582))
+- **Player:** Slideshow controller + \<hyperframes-slideshow\> component ([7af3eb8f](https://github.com/heygen-com/hyperframes/commit/7af3eb8f80945e880138570d49aee585a5346e19), [#1581](https://github.com/heygen-com/hyperframes/pull/1581))
+- **Core:** Slideshow schema, parser, and lint rule ([83764579](https://github.com/heygen-com/hyperframes/commit/83764579898b9df4a7880761870faa983fc927bf), [#1580](https://github.com/heygen-com/hyperframes/pull/1580))
+- **Sdk:** Image-alpha hit-test phase 1 (WS-G) ([37efbcb9](https://github.com/heygen-com/hyperframes/commit/37efbcb9553eacba3797a2de32ee7c7100ca4cb6), [#1574](https://github.com/heygen-com/hyperframes/pull/1574))
+- **Sdk:** Ws-3c — addWithKeyframes + replaceWithKeyframes SDK ops (acorn writer) ([418f198b](https://github.com/heygen-com/hyperframes/commit/418f198b3391a44728433a788c7c34f9b280ca6c), [#1572](https://github.com/heygen-com/hyperframes/pull/1572))
+- **Sdk:** AddElement forward op — mint hf-id, inverse = removeElement (WS-D) ([0ca01c88](https://github.com/heygen-com/hyperframes/commit/0ca01c88cfbaedad3a5493a8185e37eb7559fdb7), [#1571](https://github.com/heygen-com/hyperframes/pull/1571))
+- **Sdk:** Ws-c elastic timing + word-alignment resolver (WS-C) ([f65e2296](https://github.com/heygen-com/hyperframes/commit/f65e229663c40376456ad32f37e1b29e5a877f9c), [#1570](https://github.com/heygen-com/hyperframes/pull/1570))
+- **Sdk:** Ws-b variables/brand — object-valued font/image + B1 JSON model ([d0e520db](https://github.com/heygen-com/hyperframes/commit/d0e520dbd950aa56c56b752c25db8b751a9bf1ea), [#1569](https://github.com/heygen-com/hyperframes/pull/1569))
+
+## Fixes
+
+- **Slideshow:** Present media controls ([f0c4dee7](https://github.com/heygen-com/hyperframes/commit/f0c4dee70584f02a546c0cdb6d02d8b5542a4a4b), [#1601](https://github.com/heygen-com/hyperframes/pull/1601))
+- **Core:** Mute preview audio per-element so a slow-decoding track isn't silenced ([cd832f01](https://github.com/heygen-com/hyperframes/commit/cd832f01ac953cad793da4e379302d2f1c60dc6a), [#1602](https://github.com/heygen-com/hyperframes/pull/1602))
+- **Core:** Import cssSelector test from vitest, not bun:test ([82b6ccde](https://github.com/heygen-com/hyperframes/commit/82b6ccde7934836c100c47206bacca5455c8b3d8), [#1599](https://github.com/heygen-com/hyperframes/pull/1599))
+- **Core,studio:** Escape user values in querySelector attribute selectors ([c0ffdc0f](https://github.com/heygen-com/hyperframes/commit/c0ffdc0fb0d5adc4bf9df0afe07f4f5a23d2fb51))
+- **Sdk,studio:** Restore DOM edit cutover parity ([758eda99](https://github.com/heygen-com/hyperframes/commit/758eda995c9c2dedb4d7939769f149209663f841), [#1565](https://github.com/heygen-com/hyperframes/pull/1565))
+- **Slideshow:** Finish remaining split-PR review findings ([f05b3f9c](https://github.com/heygen-com/hyperframes/commit/f05b3f9c7c07a08cbe917f1293fe31e3b0e9f9d6), [#1594](https://github.com/heygen-com/hyperframes/pull/1594))
+- **Slideshow:** Address code-review findings #1580-1584 ([cc2220e5](https://github.com/heygen-com/hyperframes/commit/cc2220e59ec7e0b48c0991445ca0857d3ac752d3), [#1585](https://github.com/heygen-com/hyperframes/pull/1585))
+- **Release:** Scope tag-monotonicity guard to tags reachable from HEAD ([3a28d3f6](https://github.com/heygen-com/hyperframes/commit/3a28d3f6b8395112950d58f940b2670d870e91b7))
+- **Sdk:** Code-review follow-ups (WS-B/C/3.C, #1569/#1570/#1572) ([dd6fad6b](https://github.com/heygen-com/hyperframes/commit/dd6fad6bb2c77828f841430afd777dbb9e199798), [#1588](https://github.com/heygen-com/hyperframes/pull/1588))
+- **Engine:** Hold the last video frame at the inclusive clip end ([fdb8f33f](https://github.com/heygen-com/hyperframes/commit/fdb8f33fc099f0c7ba5ef3dfb033def561234e92), [#1564](https://github.com/heygen-com/hyperframes/pull/1564))
+
+## Docs & Examples
+
+- **Skill:** Slideshow authoring guidance + standalone harness reference ([b7a11637](https://github.com/heygen-com/hyperframes/commit/b7a1163753adc7efff0f15ba79ef0caaf0f06aa4), [#1583](https://github.com/heygen-com/hyperframes/pull/1583))
+
+## Internal
+
+- **Examples:** Slideshow demos — airbnb deck, startup pitch, fixture ([ae404984](https://github.com/heygen-com/hyperframes/commit/ae40498433de266999031d8230a232f89f4a9cad), [#1584](https://github.com/heygen-com/hyperframes/pull/1584))
+- **Core:** Gate acorn GSAP writer behind cutover flag; keep recast default (WS-3F) ([967bf9f9](https://github.com/heygen-com/hyperframes/commit/967bf9f9ed0303154c755e3ee8f9b829f6f41174), [#1573](https://github.com/heygen-com/hyperframes/pull/1573))
+- **Publish:** Publish @hyperframes/sdk to npm ([7607a714](https://github.com/heygen-com/hyperframes/commit/7607a714a6c46407bb42cff1ed754ea8997035df), [#1587](https://github.com/heygen-com/hyperframes/pull/1587))
+
+[View the full commit range](https://github.com/heygen-com/hyperframes/compare/v0.6.112...v0.6.115).
+</Update>
+
 <Update
   label="HyperFrames v0.6.114"
   description="Released - 2026-06-19"
diff --git a/packages/aws-lambda/package.json b/packages/aws-lambda/package.json
index c478341e0..d9e3938b4 100644
--- a/packages/aws-lambda/package.json
+++ b/packages/aws-lambda/package.json
@@ -1,6 +1,6 @@
 {
   "name": "@hyperframes/aws-lambda",
-  "version": "0.6.114",
+  "version": "0.6.115",
   "description": "AWS Lambda adapter for HyperFrames distributed rendering — handler, client-side SDK, and CDK construct.",
   "repository": {
     "type": "git",
diff --git a/packages/cli/package.json b/packages/cli/package.json
index ce01dd8d7..f46dc42f6 100644
--- a/packages/cli/package.json
+++ b/packages/cli/package.json
@@ -1,6 +1,6 @@
 {
   "name": "@hyperframes/cli",
-  "version": "0.6.114",
+  "version": "0.6.115",
   "description": "HyperFrames CLI — create, preview, and render HTML video compositions",
   "repository": {
     "type": "git",
diff --git a/packages/core/package.json b/packages/core/package.json
index 552270a54..fa1623ed4 100644
--- a/packages/core/package.json
+++ b/packages/core/package.json
@@ -1,6 +1,6 @@
 {
   "name": "@hyperframes/core",
-  "version": "0.6.114",
+  "version": "0.6.115",
   "description": "",
   "repository": {
     "type": "git",
diff --git a/packages/engine/package.json b/packages/engine/package.json
index e701d35ea..b5c27fd89 100644
--- a/packages/engine/package.json
+++ b/packages/engine/package.json
@@ -1,6 +1,6 @@
 {
   "name": "@hyperframes/engine",
-  "version": "0.6.114",
+  "version": "0.6.115",
   "description": "Seekable web page to video rendering engine (Puppeteer + FFmpeg)",
   "repository": {
     "type": "git",
diff --git a/packages/gcp-cloud-run/package.json b/packages/gcp-cloud-run/package.json
index 4bb76fa77..4e5c94eb5 100644
--- a/packages/gcp-cloud-run/package.json
+++ b/packages/gcp-cloud-run/package.json
@@ -1,6 +1,6 @@
 {
   "name": "@hyperframes/gcp-cloud-run",
-  "version": "0.6.114",
+  "version": "0.6.115",
   "description": "Google Cloud Run + Workflows adapter for HyperFrames distributed rendering — request handler, client-side SDK, and Terraform module.",
   "repository": {
     "type": "git",
diff --git a/packages/player/package.json b/packages/player/package.json
index 776c1950e..40a31db23 100644
--- a/packages/player/package.json
+++ b/packages/player/package.json
@@ -1,6 +1,6 @@
 {
   "name": "@hyperframes/player",
-  "version": "0.6.114",
+  "version": "0.6.115",
   "description": "Embeddable web component for HyperFrames compositions",
   "repository": {
     "type": "git",
diff --git a/packages/producer/package.json b/packages/producer/package.json
index 05873f0e7..f71df6654 100644
--- a/packages/producer/package.json
+++ b/packages/producer/package.json
@@ -1,6 +1,6 @@
 {
   "name": "@hyperframes/producer",
-  "version": "0.6.114",
+  "version": "0.6.115",
   "description": "HTML-to-video rendering engine using Chrome's BeginFrame API",
   "repository": {
     "type": "git",
diff --git a/packages/sdk/package.json b/packages/sdk/package.json
index 1ed4c47c9..e5d013f57 100644
--- a/packages/sdk/package.json
+++ b/packages/sdk/package.json
@@ -1,6 +1,6 @@
 {
   "name": "@hyperframes/sdk",
-  "version": "0.6.114",
+  "version": "0.6.115",
   "description": "Headless, framework-neutral HyperFrames composition editing engine",
   "repository": {
     "type": "git",
diff --git a/packages/shader-transitions/package.json b/packages/shader-transitions/package.json
index 8990fe073..b0d974b85 100644
--- a/packages/shader-transitions/package.json
+++ b/packages/shader-transitions/package.json
@@ -1,6 +1,6 @@
 {
   "name": "@hyperframes/shader-transitions",
-  "version": "0.6.114",
+  "version": "0.6.115",
   "description": "WebGL shader transitions for HyperFrames compositions",
   "repository": {
     "type": "git",
diff --git a/packages/studio/package.json b/packages/studio/package.json
index 052a6dd43..984cceafd 100644
--- a/packages/studio/package.json
+++ b/packages/studio/package.json
@@ -1,6 +1,6 @@
 {
   "name": "@hyperframes/studio",
-  "version": "0.6.114",
+  "version": "0.6.115",
   "description": "",
   "repository": {
     "type": "git",
diff --git a/releases/v0.6.115.md b/releases/v0.6.115.md
new file mode 100644
index 000000000..85ce8fd0b
--- /dev/null
+++ b/releases/v0.6.115.md
@@ -0,0 +1,47 @@
+# HyperFrames v0.6.115
+
+Released on 2026-06-20.
+
+Full slideshow stack: schema, parser, controller, `<hyperframes-slideshow>` web component, presenter mode, branching editor panel, and `hyperframes present` CLI command. SDK gains element add/remove ops, elastic timing, keyframe writers, variables/brand model, and image-alpha hit-testing. Fixes cross-realm iframe media handling, per-element audio muting, querySelector injection, and DOM edit parity.
+
+## Features
+
+- **Studio:** Slideshow branching editor panel UI ([04a775b5](https://github.com/heygen-com/hyperframes/commit/04a775b58a2e0272d294b4e6f2c7b1f4aed794cb), [#1592](https://github.com/heygen-com/hyperframes/pull/1592))
+- **Studio:** Slideshow manifest persistence + panel helpers ([b74020fa](https://github.com/heygen-com/hyperframes/commit/b74020fa56ba4382d18f3ca23de349cf8c63e130), [#1591](https://github.com/heygen-com/hyperframes/pull/1591))
+- **Player:** <hyperframes-slideshow> web component + presenter ([075302cd](https://github.com/heygen-com/hyperframes/commit/075302cd0312e0c14f049d50f011c958140af540), [#1590](https://github.com/heygen-com/hyperframes/pull/1590))
+- **Player:** Slideshow controller state machine ([6938d6ac](https://github.com/heygen-com/hyperframes/commit/6938d6acf2d8ee9a4b01fe541f38a9a8b00dc0c6), [#1589](https://github.com/heygen-com/hyperframes/pull/1589))
+- **Studio:** Slideshow branching editor panel ([3861e8e9](https://github.com/heygen-com/hyperframes/commit/3861e8e9fc0f0b6660c31b3668bd71172aced38f), [#1582](https://github.com/heygen-com/hyperframes/pull/1582))
+- **Player:** Slideshow controller + <hyperframes-slideshow> component ([7af3eb8f](https://github.com/heygen-com/hyperframes/commit/7af3eb8f80945e880138570d49aee585a5346e19), [#1581](https://github.com/heygen-com/hyperframes/pull/1581))
+- **Core:** Slideshow schema, parser, and lint rule ([83764579](https://github.com/heygen-com/hyperframes/commit/83764579898b9df4a7880761870faa983fc927bf), [#1580](https://github.com/heygen-com/hyperframes/pull/1580))
+- **Sdk:** Image-alpha hit-test phase 1 (WS-G) ([37efbcb9](https://github.com/heygen-com/hyperframes/commit/37efbcb9553eacba3797a2de32ee7c7100ca4cb6), [#1574](https://github.com/heygen-com/hyperframes/pull/1574))
+- **Sdk:** Ws-3c — addWithKeyframes + replaceWithKeyframes SDK ops (acorn writer) ([418f198b](https://github.com/heygen-com/hyperframes/commit/418f198b3391a44728433a788c7c34f9b280ca6c), [#1572](https://github.com/heygen-com/hyperframes/pull/1572))
+- **Sdk:** AddElement forward op — mint hf-id, inverse = removeElement (WS-D) ([0ca01c88](https://github.com/heygen-com/hyperframes/commit/0ca01c88cfbaedad3a5493a8185e37eb7559fdb7), [#1571](https://github.com/heygen-com/hyperframes/pull/1571))
+- **Sdk:** Ws-c elastic timing + word-alignment resolver (WS-C) ([f65e2296](https://github.com/heygen-com/hyperframes/commit/f65e229663c40376456ad32f37e1b29e5a877f9c), [#1570](https://github.com/heygen-com/hyperframes/pull/1570))
+- **Sdk:** Ws-b variables/brand — object-valued font/image + B1 JSON model ([d0e520db](https://github.com/heygen-com/hyperframes/commit/d0e520dbd950aa56c56b752c25db8b751a9bf1ea), [#1569](https://github.com/heygen-com/hyperframes/pull/1569))
+
+## Fixes
+
+- **Slideshow:** Present media controls ([f0c4dee7](https://github.com/heygen-com/hyperframes/commit/f0c4dee70584f02a546c0cdb6d02d8b5542a4a4b), [#1601](https://github.com/heygen-com/hyperframes/pull/1601))
+- **Core:** Mute preview audio per-element so a slow-decoding track isn't silenced ([cd832f01](https://github.com/heygen-com/hyperframes/commit/cd832f01ac953cad793da4e379302d2f1c60dc6a), [#1602](https://github.com/heygen-com/hyperframes/pull/1602))
+- **Core:** Import cssSelector test from vitest, not bun:test ([82b6ccde](https://github.com/heygen-com/hyperframes/commit/82b6ccde7934836c100c47206bacca5455c8b3d8), [#1599](https://github.com/heygen-com/hyperframes/pull/1599))
+- **Core,studio:** Escape user values in querySelector attribute selectors ([c0ffdc0f](https://github.com/heygen-com/hyperframes/commit/c0ffdc0fb0d5adc4bf9df0afe07f4f5a23d2fb51))
+- **Sdk,studio:** Restore DOM edit cutover parity ([758eda99](https://github.com/heygen-com/hyperframes/commit/758eda995c9c2dedb4d7939769f149209663f841), [#1565](https://github.com/heygen-com/hyperframes/pull/1565))
+- **Slideshow:** Finish remaining split-PR review findings ([f05b3f9c](https://github.com/heygen-com/hyperframes/commit/f05b3f9c7c07a08cbe917f1293fe31e3b0e9f9d6), [#1594](https://github.com/heygen-com/hyperframes/pull/1594))
+- **Slideshow:** Address code-review findings #1580-1584 ([cc2220e5](https://github.com/heygen-com/hyperframes/commit/cc2220e59ec7e0b48c0991445ca0857d3ac752d3), [#1585](https://github.com/heygen-com/hyperframes/pull/1585))
+- **Release:** Scope tag-monotonicity guard to tags reachable from HEAD ([3a28d3f6](https://github.com/heygen-com/hyperframes/commit/3a28d3f6b8395112950d58f940b2670d870e91b7))
+- **Sdk:** Code-review follow-ups (WS-B/C/3.C, #1569/#1570/#1572) ([dd6fad6b](https://github.com/heygen-com/hyperframes/commit/dd6fad6bb2c77828f841430afd777dbb9e199798), [#1588](https://github.com/heygen-com/hyperframes/pull/1588))
+- **Engine:** Hold the last video frame at the inclusive clip end ([fdb8f33f](https://github.com/heygen-com/hyperframes/commit/fdb8f33fc099f0c7ba5ef3dfb033def561234e92), [#1564](https://github.com/heygen-com/hyperframes/pull/1564))
+
+## Docs & Examples
+
+- **Skill:** Slideshow authoring guidance + standalone harness reference ([b7a11637](https://github.com/heygen-com/hyperframes/commit/b7a1163753adc7efff0f15ba79ef0caaf0f06aa4), [#1583](https://github.com/heygen-com/hyperframes/pull/1583))
+
+## Internal
+
+- **Examples:** Slideshow demos — airbnb deck, startup pitch, fixture ([ae404984](https://github.com/heygen-com/hyperframes/commit/ae40498433de266999031d8230a232f89f4a9cad), [#1584](https://github.com/heygen-com/hyperframes/pull/1584))
+- **Core:** Gate acorn GSAP writer behind cutover flag; keep recast default (WS-3F) ([967bf9f9](https://github.com/heygen-com/hyperframes/commit/967bf9f9ed0303154c755e3ee8f9b829f6f41174), [#1573](https://github.com/heygen-com/hyperframes/pull/1573))
+- **Publish:** Publish @hyperframes/sdk to npm ([7607a714](https://github.com/heygen-com/hyperframes/commit/7607a714a6c46407bb42cff1ed754ea8997035df), [#1587](https://github.com/heygen-com/hyperframes/pull/1587))
+
+## Full changelog
+
+https://github.com/heygen-com/hyperframes/compare/v0.6.112...v0.6.115