diff --git a/samples/bedroom/.gitignore b/samples/bedroom/.gitignore
new file mode 100644
index 0000000..3912fd9
--- /dev/null
+++ b/samples/bedroom/.gitignore
@@ -0,0 +1,7 @@
+node_modules/
+dist/
+public/assets/*
+!public/assets/manifest.json
+evidence/*
+!evidence/.gitkeep
+__pycache__/
diff --git a/samples/bedroom/README.md b/samples/bedroom/README.md
new file mode 100644
index 0000000..3f1613d
--- /dev/null
+++ b/samples/bedroom/README.md
@@ -0,0 +1,55 @@
+HEL-711 最小动态校对小样，基于 main `1e9b08a`。仅在 `samples/bedroom` 内工作；不连接人格、记忆、天气或语音。采用 HEL-708 的环境/人物/交谈分层边界，以及 CG-001～026 的当前需求。旧演示不变。
+
+## 本地复核
+
+1. 将本卡附件 `HEL-711-review-bundle.zip` 中的 `public/assets` 解压到此目录对应位置。
+2. `npm ci --ignore-scripts --no-audit --no-fund`，沿用旧前端分支的 package.json/package-lock.json/tsconfig.json，无新依赖。
+3. `npm run build`（包含严格 TypeScript 检查）。
+4. `npm run dev -- --port 5173`，本机浏览器打开终端输出的地址。
+5. `python3 tools/browser_check.py` 使用已安装的 Playwright/Chromium，自动启停本机测试服务并保存证据。此运行机需要给该命令设置 `LD_LIBRARY_PATH=/home/xiaomo/pwlibs/root/usr/lib/x86_64-linux-gnu`，复用了已有浏览器库，未安装系统依赖。
+
+素材不进 Git，缺失时页面明确提示；manifest 在 Git 中保存来源、原图 SHA256、坐标、编码和问题。附件内含完整 assets、已构建 dist、浏览器连续录屏、原始试片、透明试片、分层校对图及生成工作流/日志。
+
+## 代码与边界
+
+- `src/main.ts`：一个持久 video 元素驱动透明 canvas；环境按钮只改环境亮度，不重建/seek 视频。人物、前景遮挡、接触阴影独立开关；静态近景不替代真实交谈。
+- `src/tokens.css`：原样复用旧前端唯一 token 表。`style.css` 为独立工程校对台，无第二套同类组件。
+- `tools/extract_layers.py`：读取现有 SAM vit-b 模型的原始 modeling API，避免可选 predictor 的 OpenCV 依赖；不伪造 cv2，不下载。原图 RGB 保留，只生成 alpha；封闭孔洞填充、0.65px 羽化。
+- `tools/contact_layers.py`：从原入景图提取毯子前景，另建可关闭的暂定接触阴影；未宣称物理阴影校准完成。
+- `tools/generate_once.py`：原 ComfyUI venv + 原生 Wan 节点，单片段、离线、自定义节点禁用。临时服务器仅监听回环 18189，finally 终止自己启动的精确 PID。不修改现有服务、系统 Python、驱动或模型路径配置。
+- `tools/matte_video.py`：49 帧逐帧 SAM 分割，原有 PyAV 编码 VP9 alpha。原始视频未抠像的背景不用于浏览器人物合成。
+- `tools/browser_check.py`：真实 Chromium 检查、三种视口截图和可下载连续录屏。页面隐藏的事件处理做了合成 visibilitychange 检查；真实系统切后台/锁屏仍待体验环境手测。
+
+## 素材处理命令
+
+处理目录：`.12:/media/lucian/Downloads/ComfyUI/output/hel711-task`，输入复制到其 `assets`，脚本放此目录；没有改变现有项目输入。原图由 Multica 鉴权 attachment download 获取。运行时使用原 `/media/lucian/Downloads/ComfyUI/venv/bin/python`。
+
+```bash
+python extract_layers.py assets \
+  --sam-source /media/lucian/Downloads/ComfyUI/custom_nodes/was-node-suite-comfyui/repos/SAM/segment_anything \
+  --checkpoint /media/lucian/Downloads/ComfyUI/models/sams/sam_vit_b_01ec64.pth
+python generate_once.py
+python matte_video.py
+```
+
+回传处理后的素材到本地 `public/assets`，运行 `python3 tools/contact_layers.py`。手工蒙版和坐标均保留在脚本中。`workflow.json` 是本次实际运行的请求，最终脚本仅补了目录创建/日志关闭等清理逻辑；日志和 history 可交叉核对。执行新试片前必须重新检查显存和端口；禁止停止已有服务腾资源。
+
+## 当前实测与未通过项
+
+当前结果见 `REPORT.md`，属于可审核候选，不代表 D1–D6 全部通过。图层是真实独立合成；没有用重生成整幅图代替分层。近景仍用已确认 v2 静态方向图；没有真人语音或口型。
+
+## HEL-712 返工复现
+
+本轮只补原动作的真实回程，并处理书本/手部蒙版；环境、机位、比例、UI token 与静态近景不变。完整返工包中的 `public/assets` 替换旧素材后执行同一构建/浏览器检查。
+
+已有 ComfyUI 环境中，保留原片在 `output/hel711-task/reading_00001_.webm`、原透明片在同目录 `reading-alpha.webm`：
+
+```bash
+python generate_return.py
+python stabilize_loop.py
+python measure_loop.py
+```
+
+脚本放在 `output/hel712-task` 并附同目录 `extract_layers.py`。生成器只用已有原生 `WanFirstLastFrameToVideo` 节点与原有权重，以原片 f48、f0 为两端，seed 712，只生成一条49帧回程。服务器仍仅临时监听回环18189；主程序收齐结果后停止精确子进程。`stabilize_loop.py` 读取原49帧 alpha，新增49帧按书本/衣袖补充分割提示；只在原512坐标 y175–330 对动作对齐的5帧有符号距离去掉最大/最小值后取均值稳定，RGB不做时域融合，原发丝区域不重新分割。原始两段按顺序拼成98帧，接点48→49、97→0，无倒放/淡化/冻结/短窗口裁切。
+
+`measure_loop.py` 输出固定坐标口径的逐对差异、蒙版统计、动作补偿残差、接头与手部证据图；数值不替代目验。`browser_check.py` 先在真实Chromium完整播放至少3周期，再做原交互与三视口复测。真实后台/锁屏及Safari/iOS仍未测。
diff --git a/samples/bedroom/REPORT.md b/samples/bedroom/REPORT.md
new file mode 100644
index 0000000..c60e1bd
--- /dev/null
+++ b/samples/bedroom/REPORT.md
@@ -0,0 +1,52 @@
+HEL-712：原阅读动作循环与书本/手部蒙版返工候选，交总工复审，不部署。
+
+## 实现
+
+沿用原人物、米色开衫、深灰长裤、卧室、机位与552px人物落点。现有 Wan2.2 原生首尾帧条件节点，使用原片 f48→f0，seed 712，实际生成一条49帧抬头回程。原49帧向前播放，随后49帧真实回程，98帧/16fps/6.125秒，内部接点48→49，跨周期97→0。没有倒放、冻结、静态摆动、遮脸淡化或短窗口裁切。
+
+原49帧 alpha 不重新分割；新增49帧补书本/衣袖正点，保留连通人物，去掉分离的沙发碎点。两段仅在原512px坐标 y175:330（输出552px坐标189:356）稳定蒙版：TV-L1对齐前后各2帧，有符号距离去掉最高/最低值，再取均值，限制到当前轮廓6px不确定区域，首尾8行回接原蒙版。只处理alpha，RGB不做时间平均；原发丝区域保持原alpha。原始源片与透明片逐帧映射见manifest/stabilization.json。
+
+第一次新增回程直接套原分割提示时，会漏掉书本/衣袖；该版已拒绝，`before-crops.png` 保留实证。补充分割提示后才进入最终蒙版稳定。共生成一条视频，没有批量换装或动作试片。第一次稳定使用中值共识，接头alpha变化仍偏集中；最终使用去极值均值，缓和了两个分段蒙版的多数票切换。
+
+## 同口径差异与边缘统计
+
+本报告独立固定口径：RGB头部框为512px源坐标 x230:340、y50:180；蒙版缩到512px、alpha>127，边界用二值侵蚀差，书本/手部带为全部x、y175:330。与HEL-710采用的框/缩放细节不同，所以这里原接头22.30不直接与审核卡29.5混算；下列前后全部由同一脚本重算。完整逐对数据见 `evidence/metrics.json`，覆盖全部98个相邻对（包括末→首）。
+
+| 头部RGB绝对差 /255 | 最小 | 中位 | P95 | 最大 |
+|---|---:|---:|---:|---:|
+| 原49帧普通相邻 | 0.36 | 1.73 | 4.97 | 5.75 |
+| 新98帧普通相邻（排除两接头） | 0.24 | 1.65 | 5.47 | 8.30 |
+
+原f48→f0：22.30；新内部f48→49：3.66；新跨周期f97→0：5.22。两个接头落在普通相邻变化范围内。接头前后整帧、头部放大与98帧序列均附；连续录屏为实际浏览器播放，未用离线合成冒充。
+
+| 蒙版指标 | 稳定前 | 最终稳定后 |
+|---|---:|---:|
+| 原49帧带内边界像素范围 | 510–794 | 509–604 |
+| 原49帧最差相邻边界变化 | 255 | 75 |
+| 原49帧相邻alpha开关最大像素 | 771 | 300 |
+| 全98帧边界像素范围 | 504–794 | 503–604 |
+| 全98对最差边界变化（含循环） | 261 | 75 |
+| 全98对alpha开关P95 / 最大像素 | 505.05 / 988 | 142.55 / 300 |
+| 内部 / 跨周期接头alpha开关像素 | 988 / 528 | 195 / 193 |
+| 动作补偿后alpha开关P95 / 最大 | 503.25 / 988 | 152.75 / 300 |
+
+动作补偿使用同一源RGB光流对齐前后蒙版；可见减少的是分割开关，不靠抹掉真实运动。人物内部透明片与源RGB编码误差逐帧中位1.89、最大2.10/255；无RGB时间混合。带外alpha逐数组一致为true。重点帧可见书本/指尖与袖口保持，未见新增吞手或RGB拖影；仍需总工以连续视频独立确认。没有把数值降低当作人体解剖或身份认证。
+
+## 验证
+
+- 来源包SHA256：60/60核对一致。
+- `npm ci --ignore-scripts --no-audit --no-fund`：沿用锁文件，无新依赖。
+- `npm run build`：严格TypeScript检查和Vite构建通过；原JS/CSS逻辑保持，返工通过素材和工具落地。
+- `ruff check src tests samples/bedroom/tools`：通过。
+- `PYTHONPATH=src python3 -m pytest -q`：78通过。
+- `LD_LIBRARY_PATH=/home/xiaomo/pwlibs/root/usr/lib/x86_64-linux-gnu python3 tools/browser_check.py`：真实Chromium通过。最终视频先完整播放3周期，记录循环时间约6.28、12.42、18.56秒；此段全部图层显示，之后再执行交互测试。
+- VP9 alpha背景0/人物255；环境切换currentTime 0.905816→0.905816，source不变；图层开关、静态近景进退且播放继续、手动暂停、合成visibility暂停/恢复、减少动效切静态、缺片回退通过；1600×900、1280×800、390×844无横溢，人脸在画面内；pageerror=0。
+- 真实后台/锁屏、Safari/iOS未测；近景仅静态，未增加口型、语音或后台生活功能。手机构图、沙发几何、重打光与近景润色保持原记录。
+
+## 文件与运行边界
+
+修改 `tools/extract_layers.py`（可选补充提示）、新增 `tools/generate_return.py`、`stabilize_loop.py`、`measure_loop.py`，扩展 `tools/browser_check.py` 的连续三周期验证，更新manifest/README/本报告。没有改CSS、主题、核心服务或部署配置。
+
+分支继续 `hel-711-layered-bedroom`，基于原444ee56；最终提交与PR head核对写入附件 `DELIVERY.json` 及任务完成评论。素材不进Git。完整包包含源码、构建产物、manifest、SHA256SUMS、原始前程/回程、整周期源片、透明片、逐帧前后alpha、生成请求/节点/history/server日志、浏览器连续录屏、三视口及接头/手部证据、复现说明。
+
+严格校验了.12已确认SSH指纹。临时ComfyUI仅回环18189、精确PID600329，生成请求成功后已停止。CPU蒙版任务均前台收齐，没有遗留生成任务、没有新增依赖/模型/付费接口；ASR/TTS及18080原演示保持运行。未推main、未合并、未部署。
diff --git a/samples/bedroom/index.html b/samples/bedroom/index.html
new file mode 100644
index 0000000..70a653b
--- /dev/null
+++ b/samples/bedroom/index.html
@@ -0,0 +1,38 @@
+<!doctype html>
+<html lang="zh-CN">
+<head><meta charset="UTF-8"><meta name="viewport" content="width=device-width,initial-scale=1"><title>卧室分层校对 · HEL-711</title></head>
+<body>
+<main>
+  <header><h1>卧室分层校对</h1><p>工程小样 · 手动光照演示 · 近景仅静态参考，未接语音或口型</p></header>
+  <div id="stage" role="img" aria-label="固定机位卧室人物合成">
+    <div id="frame">
+      <img id="environment" src="./assets/environment.png" alt="无人高层卧室">
+      <img id="shadow" src="./assets/contact-shadow.png" alt="" class="layer">
+      <img id="person" src="./assets/person.png" alt="阅读人物透明层" class="layer">
+      <canvas id="motion" width="552" height="552" hidden></canvas>
+      <img id="occlusion" src="./assets/occlusion.png" alt="" class="layer">
+      <img id="mask" src="./assets/person-mask.png" alt="人物蒙版" class="layer" hidden>
+      <img id="talk" src="./assets/talk-reference.png" alt="交谈静态近景参考" class="layer" hidden>
+    </div>
+  </div>
+  <video id="source" muted playsinline loop preload="metadata" hidden></video>
+  <section aria-label="校对控制">
+    <fieldset><legend>图层开关</legend>
+      <label><input id="show-person" type="checkbox" checked>人物</label>
+      <label><input id="show-shadow" type="checkbox" checked>接触阴影</label>
+      <label><input id="show-occlusion" type="checkbox" checked>前景毯子</label>
+      <label><input id="show-mask" type="checkbox">仅看人物蒙版</label>
+    </fieldset>
+    <div class="controls">
+      <button id="lighting" type="button" aria-pressed="false">光照演示：原始</button>
+      <button id="play" type="button" disabled>读取动作素材</button>
+      <button id="closeup" type="button" aria-pressed="false">进入静态近景</button>
+    </div>
+    <p id="status" role="status">读取素材清单…</p>
+    <output id="time">动作位置：未载入</output>
+    <p id="fallback" role="alert" hidden></p>
+    <p>人物、房间和近景来自已确认的 v2 参考。图层独立不等于几何、发丝与循环已经通过验收。</p>
+  </section>
+</main>
+<script type="module" src="./src/main.ts"></script>
+</body></html>
diff --git a/samples/bedroom/package-lock.json b/samples/bedroom/package-lock.json
new file mode 100644
index 0000000..7d2179a
--- /dev/null
+++ b/samples/bedroom/package-lock.json
@@ -0,0 +1,1166 @@
+{
+  "name": "cybergril-rain-room",
+  "version": "0.1.0",
+  "lockfileVersion": 3,
+  "requires": true,
+  "packages": {
+    "": {
+      "name": "cybergril-rain-room",
+      "version": "0.1.0",
+      "dependencies": {
+        "pixi.js": "^8.0.0"
+      },
+      "devDependencies": {
+        "typescript": "~5.9.3",
+        "vite": "^5.4.0"
+      }
+    },
+    "node_modules/@esbuild/aix-ppc64": {
+      "version": "0.21.5",
+      "resolved": "https://registry.npmjs.org/@esbuild/aix-ppc64/-/aix-ppc64-0.21.5.tgz",
+      "integrity": "sha512-1SDgH6ZSPTlggy1yI6+Dbkiz8xzpHJEVAlF/AM1tHPLsf5STom9rwtjE4hKAF20FfXXNTFqEYXyJNWh1GiZedQ==",
+      "cpu": [
+        "ppc64"
+      ],
+      "dev": true,
+      "license": "MIT",
+      "optional": true,
+      "os": [
+        "aix"
+      ],
+      "engines": {
+        "node": ">=12"
+      }
+    },
+    "node_modules/@esbuild/android-arm": {
+      "version": "0.21.5",
+      "resolved": "https://registry.npmjs.org/@esbuild/android-arm/-/android-arm-0.21.5.tgz",
+      "integrity": "sha512-vCPvzSjpPHEi1siZdlvAlsPxXl7WbOVUBBAowWug4rJHb68Ox8KualB+1ocNvT5fjv6wpkX6o/iEpbDrf68zcg==",
+      "cpu": [
+        "arm"
+      ],
+      "dev": true,
+      "license": "MIT",
+      "optional": true,
+      "os": [
+        "android"
+      ],
+      "engines": {
+        "node": ">=12"
+      }
+    },
+    "node_modules/@esbuild/android-arm64": {
+      "version": "0.21.5",
+      "resolved": "https://registry.npmjs.org/@esbuild/android-arm64/-/android-arm64-0.21.5.tgz",
+      "integrity": "sha512-c0uX9VAUBQ7dTDCjq+wdyGLowMdtR/GoC2U5IYk/7D1H1JYC0qseD7+11iMP2mRLN9RcCMRcjC4YMclCzGwS/A==",
+      "cpu": [
+        "arm64"
+      ],
+      "dev": true,
+      "license": "MIT",
+      "optional": true,
+      "os": [
+        "android"
+      ],
+      "engines": {
+        "node": ">=12"
+      }
+    },
+    "node_modules/@esbuild/android-x64": {
+      "version": "0.21.5",
+      "resolved": "https://registry.npmjs.org/@esbuild/android-x64/-/android-x64-0.21.5.tgz",
+      "integrity": "sha512-D7aPRUUNHRBwHxzxRvp856rjUHRFW1SdQATKXH2hqA0kAZb1hKmi02OpYRacl0TxIGz/ZmXWlbZgjwWYaCakTA==",
+      "cpu": [
+        "x64"
+      ],
+      "dev": true,
+      "license": "MIT",
+      "optional": true,
+      "os": [
+        "android"
+      ],
+      "engines": {
+        "node": ">=12"
+      }
+    },
+    "node_modules/@esbuild/darwin-arm64": {
+      "version": "0.21.5",
+      "resolved": "https://registry.npmjs.org/@esbuild/darwin-arm64/-/darwin-arm64-0.21.5.tgz",
+      "integrity": "sha512-DwqXqZyuk5AiWWf3UfLiRDJ5EDd49zg6O9wclZ7kUMv2WRFr4HKjXp/5t8JZ11QbQfUS6/cRCKGwYhtNAY88kQ==",
+      "cpu": [
+        "arm64"
+      ],
+      "dev": true,
+      "license": "MIT",
+      "optional": true,
+      "os": [
+        "darwin"
+      ],
+      "engines": {
+        "node": ">=12"
+      }
+    },
+    "node_modules/@esbuild/darwin-x64": {
+      "version": "0.21.5",
+      "resolved": "https://registry.npmjs.org/@esbuild/darwin-x64/-/darwin-x64-0.21.5.tgz",
+      "integrity": "sha512-se/JjF8NlmKVG4kNIuyWMV/22ZaerB+qaSi5MdrXtd6R08kvs2qCN4C09miupktDitvh8jRFflwGFBQcxZRjbw==",
+      "cpu": [
+        "x64"
+      ],
+      "dev": true,
+      "license": "MIT",
+      "optional": true,
+      "os": [
+        "darwin"
+      ],
+      "engines": {
+        "node": ">=12"
+      }
+    },
+    "node_modules/@esbuild/freebsd-arm64": {
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+        "tsc": "bin/tsc",
+        "tsserver": "bin/tsserver"
+      },
+      "engines": {
+        "node": ">=14.17"
+      }
+    },
+    "node_modules/vite": {
+      "version": "5.4.21",
+      "resolved": "https://registry.npmjs.org/vite/-/vite-5.4.21.tgz",
+      "integrity": "sha512-o5a9xKjbtuhY6Bi5S3+HvbRERmouabWbyUcpXXUA1u+GNUKoROi9byOJ8M0nHbHYHkYICiMlqxkg1KkYmm25Sw==",
+      "dev": true,
+      "license": "MIT",
+      "dependencies": {
+        "esbuild": "^0.21.3",
+        "postcss": "^8.4.43",
+        "rollup": "^4.20.0"
+      },
+      "bin": {
+        "vite": "bin/vite.js"
+      },
+      "engines": {
+        "node": "^18.0.0 || >=20.0.0"
+      },
+      "funding": {
+        "url": "https://github.com/vitejs/vite?sponsor=1"
+      },
+      "optionalDependencies": {
+        "fsevents": "~2.3.3"
+      },
+      "peerDependencies": {
+        "@types/node": "^18.0.0 || >=20.0.0",
+        "less": "*",
+        "lightningcss": "^1.21.0",
+        "sass": "*",
+        "sass-embedded": "*",
+        "stylus": "*",
+        "sugarss": "*",
+        "terser": "^5.4.0"
+      },
+      "peerDependenciesMeta": {
+        "@types/node": {
+          "optional": true
+        },
+        "less": {
+          "optional": true
+        },
+        "lightningcss": {
+          "optional": true
+        },
+        "sass": {
+          "optional": true
+        },
+        "sass-embedded": {
+          "optional": true
+        },
+        "stylus": {
+          "optional": true
+        },
+        "sugarss": {
+          "optional": true
+        },
+        "terser": {
+          "optional": true
+        }
+      }
+    }
+  }
+}
diff --git a/samples/bedroom/package.json b/samples/bedroom/package.json
new file mode 100644
index 0000000..b5317e8
--- /dev/null
+++ b/samples/bedroom/package.json
@@ -0,0 +1,19 @@
+{
+  "name": "cybergril-rain-room",
+  "private": true,
+  "version": "0.1.0",
+  "type": "module",
+  "scripts": {
+    "dev": "vite --host 127.0.0.1",
+    "typecheck": "tsc --noEmit",
+    "build": "tsc --noEmit && vite build",
+    "preview": "vite preview --host 127.0.0.1"
+  },
+  "dependencies": {
+    "pixi.js": "^8.0.0"
+  },
+  "devDependencies": {
+    "typescript": "~5.9.3",
+    "vite": "^5.4.0"
+  }
+}
diff --git a/samples/bedroom/public/assets/manifest.json b/samples/bedroom/public/assets/manifest.json
new file mode 100644
index 0000000..b4ad4df
--- /dev/null
+++ b/samples/bedroom/public/assets/manifest.json
@@ -0,0 +1,162 @@
+{
+  "schema": "hel712-review-1",
+  "status": "review_candidate",
+  "reference_sha256": {
+    "reference.png": "226d7922e042e22e4b8a8241a7cf6f7aea50c301029978e4ca26cad9b3d56359",
+    "environment.png": "b5d4771eb010dc1d0a41d1b698e45edaa45d2f90bb441378bc32cf5c812e76a2",
+    "talk-reference.png": "0ae9b1a1cb9c590ab89a81ce4efd25de843a600ff227c184663db23e9e9c16b3"
+  },
+  "camera": {
+    "canvas": [
+      1672,
+      941
+    ],
+    "generation_crop": [
+      1120,
+      200,
+      552,
+      552
+    ],
+    "person_anchor": [
+      1390,
+      530
+    ],
+    "coordinate_units": "source pixels, top left origin",
+    "transform": "none; crop reinserted into original position",
+    "clothing": "v2 cream cardigan, charcoal trousers"
+  },
+  "layers": [
+    {
+      "file": "environment.png",
+      "source": "approved 02-v2 original",
+      "alpha": false
+    },
+    {
+      "file": "contact-shadow.png",
+      "source": "engineered ellipse 65/255, 12px blur, not physically calibrated",
+      "alpha": true
+    },
+    {
+      "file": "person.png",
+      "source": "original 03-v2 RGB + existing SAM vit-b alpha; enclosed mask holes filled",
+      "alpha": true
+    },
+    {
+      "file": "occlusion.png",
+      "source": "03-v2 blanket pixels, hand-authored polygon matte",
+      "alpha": true
+    }
+  ],
+  "motion": {
+    "status": "真实回程与书本手部蒙版返工候选，待复审",
+    "file": "reading-alpha.webm",
+    "alpha": true,
+    "maskFile": null,
+    "original": "loop-source.webm",
+    "generator": "installed ComfyUI native Wan2.2 high/low 14B fp8 + installed LightX2V 4-step LoRAs",
+    "seed": 711,
+    "dimensions": [
+      552,
+      552
+    ],
+    "generation_dimensions": [
+      512,
+      512
+    ],
+    "frames": 98,
+    "fps": 16,
+    "duration_seconds": 6.125,
+    "codec": "VP9 yuva420p / WebM",
+    "matting": "original 49 alpha retained outside hand/book band; added return frames use book/sleeve foreground points + connected subject; y175:330 (512 source) uses TV-L1 aligned 5-frame trimmed signed-distance mean within 6px uncertainty band",
+    "start_pose": "seated holding open book, head slightly tilted toward camera",
+    "end_pose": "generated return to the original relaxed camera-facing pose",
+    "loop": "forward 0–48 + real generated return 49–97; joins 48→49 and 97→0, no reverse/fade/freeze",
+    "cut_point": "no subwindow trimming",
+    "return_seed": 712,
+    "source_map": [
+      {
+        "frames": [
+          0,
+          48
+        ],
+        "file": "reading_00001_.webm",
+        "source_frames": [
+          0,
+          48
+        ]
+      },
+      {
+        "frames": [
+          49,
+          97
+        ],
+        "file": "return_00001_.webm",
+        "source_frames": [
+          0,
+          48
+        ]
+      }
+    ]
+  },
+  "closeup": {
+    "file": "talk-reference.png",
+    "type": "static_reference_only",
+    "identity_verified": false,
+    "lipsync": false,
+    "source": "approved v2 static direction reference"
+  },
+  "known_issues": [
+    "Original empty/occupied sofa and pillow geometry differs; residual contact geometry needs art review.",
+    "Book and fingers are small; hand anatomy/identity not certified.",
+    "Manual environment dimming changes background only; subject relighting not implemented.",
+    "Static near-shot is a generated reference; cross-shot face continuity not certified.",
+    "No real weather, speech, lipsync or life-state integration.",
+    "Loop joins and stabilized hand/book edges are a HEL-712 candidate pending independent re-review."
+  ],
+  "files": {
+    "talk-reference.png": {
+      "bytes": 2246098,
+      "sha256": "0ae9b1a1cb9c590ab89a81ce4efd25de843a600ff227c184663db23e9e9c16b3"
+    },
+    "reading-alpha.webm": {
+      "bytes": 1971817,
+      "sha256": "9b9b95fff6c047c68ea66d14eba1ca896a80107b7c5b531c326bfac8bdc90b76"
+    },
+    "person.png": {
+      "bytes": 2522355,
+      "sha256": "a904f4081069ba97019d3c679d8dd59102118560471f8d6337f7b29d60380f24"
+    },
+    "composite.png": {
+      "bytes": 2576324,
+      "sha256": "4354716558858d0e9ac9a4c4a025d77f4042a0e106f10fc37e500c7157e77456"
+    },
+    "person-mask.png": {
+      "bytes": 7264,
+      "sha256": "7569160b3c87ebf1d5bb66792ed6d2db6b41fde006fad0473e7db5337d18b0f7"
+    },
+    "environment.png": {
+      "bytes": 2442707,
+      "sha256": "b5d4771eb010dc1d0a41d1b698e45edaa45d2f90bb441378bc32cf5c812e76a2"
+    },
+    "occlusion-mask.png": {
+      "bytes": 4838,
+      "sha256": "dc22d1823a02df4fa5f3bf484f157c49b270f100185c0a35b3c31f28880dd3f0"
+    },
+    "generation-input.png": {
+      "bytes": 508812,
+      "sha256": "f3922903fb28c5940a2e272b70be6e33dc094039b4e275724cf3ff1aa4af1584"
+    },
+    "occlusion.png": {
+      "bytes": 2522991,
+      "sha256": "5f0f4aa7ae90ad863f694365eaa93d7d7558841ecca08c95d415731450226c4f"
+    },
+    "reference.png": {
+      "bytes": 2384917,
+      "sha256": "226d7922e042e22e4b8a8241a7cf6f7aea50c301029978e4ca26cad9b3d56359"
+    },
+    "contact-shadow.png": {
+      "bytes": 16144,
+      "sha256": "948f88c1298638158f9a21ffe107bf403106dcf6e58c72a3d6e738fe0c7cc003"
+    }
+  }
+}
diff --git a/samples/bedroom/src/main.ts b/samples/bedroom/src/main.ts
new file mode 100644
index 0000000..e3990e7
--- /dev/null
+++ b/samples/bedroom/src/main.ts
@@ -0,0 +1,141 @@
+import './style.css';
+
+type Manifest = {
+  motion: { status: string; file: string | null; alpha: boolean; maskFile: string | null };
+};
+const get = <T extends HTMLElement>(id: string) => document.getElementById(id) as T;
+const video = get<HTMLVideoElement>('source');
+const canvas = get<HTMLCanvasElement>('motion');
+const context = canvas.getContext('2d')!;
+const play = get<HTMLButtonElement>('play');
+const person = get<HTMLImageElement>('person');
+const status = get('status');
+const reduced = matchMedia('(prefers-reduced-motion: reduce)');
+const missingImages = new Set<string>();
+let ready = false;
+let wantsPlay = false;
+let near = false;
+let failed = false;
+let frameHandle = 0;
+
+function fallback(message: string) {
+  const node = get('fallback');
+  node.hidden = false;
+  node.textContent = message;
+}
+
+for (const image of document.querySelectorAll<HTMLImageElement>('#frame img')) {
+  image.addEventListener('error', () => {
+    missingImages.add(image.id);
+    image.hidden = true;
+    fallback(`素材缺失：${image.id}。请解压任务素材包到 public/assets；当前内容不能作为验收结果。`);
+  });
+}
+
+function visibility() {
+  const visible = get<HTMLInputElement>('show-person').checked;
+  const maskOnly = get<HTMLInputElement>('show-mask').checked;
+  const activeMotion = ready && !failed && !reduced.matches;
+  person.hidden = !visible || maskOnly || near || activeMotion;
+  canvas.hidden = !visible || maskOnly || near || !activeMotion;
+  get('environment').hidden = maskOnly;
+  get('mask').hidden = !maskOnly || near;
+  get('shadow').hidden = !visible || maskOnly || near || !get<HTMLInputElement>('show-shadow').checked;
+  get('occlusion').hidden = !visible || maskOnly || near || !get<HTMLInputElement>('show-occlusion').checked;
+  get('talk').hidden = !near;
+  for (const id of missingImages) get(id).hidden = true;
+}
+
+function paint() {
+  if (video.readyState >= 2) {
+    context.clearRect(0, 0, canvas.width, canvas.height);
+    context.globalCompositeOperation = 'source-over';
+    context.drawImage(video, 0, 0, canvas.width, canvas.height);
+
+  }
+  get('time').textContent = ready
+    ? `动作位置：${video.currentTime.toFixed(2)} / ${Number.isFinite(video.duration) ? video.duration.toFixed(2) : '…'} 秒`
+    : '动作位置：未载入';
+}
+
+function draw() {
+  paint();
+  if (!video.paused && !document.hidden) frameHandle = requestAnimationFrame(draw);
+}
+
+async function syncPlayback() {
+  cancelAnimationFrame(frameHandle);
+  const run = wantsPlay && ready && !failed && !document.hidden && !reduced.matches;
+  if (run) {
+    try {
+      await video.play();
+      draw();
+    } catch {
+      wantsPlay = false;
+      video.pause();
+      fallback('浏览器未允许播放；请点击播放重试。');
+    }
+  } else { video.pause(); paint(); }
+  play.textContent = ready ? (video.paused ? '播放真实试片' : '暂停真实试片') : '真实动作尚不可用';
+  visibility();
+}
+
+function layout() {
+  const stage = get('frame');
+  const scale = Math.min(stage.clientWidth / 1672, stage.clientHeight / 941);
+  const left = (stage.clientWidth - 1672 * scale) / 2;
+  const top = (stage.clientHeight - 941 * scale) / 2;
+  Object.assign(canvas.style, { left: `${left + 1120 * scale}px`, top: `${top + 200 * scale}px`,
+    width: `${552 * scale}px`, height: `${552 * scale}px` });
+}
+new ResizeObserver(layout).observe(get('frame'));
+for (const input of document.querySelectorAll('input')) input.addEventListener('change', visibility);
+get('lighting').addEventListener('click', () => {
+  const button = get<HTMLButtonElement>('lighting');
+  const dim = button.getAttribute('aria-pressed') !== 'true';
+  button.setAttribute('aria-pressed', String(dim));
+  button.textContent = `光照演示：${dim ? '环境减光' : '原始'}`;
+  get('environment').style.setProperty('--demo-environment-brightness', dim ? '0.65' : '1');
+  // No source assignment, load(), currentTime mutation or player recreation here.
+});
+get('closeup').addEventListener('click', () => {
+  near = !near;
+  const button = get<HTMLButtonElement>('closeup');
+  button.setAttribute('aria-pressed', String(near));
+  button.textContent = near ? '退出静态近景' : '进入静态近景';
+  visibility();
+});
+play.addEventListener('click', () => { wantsPlay = !wantsPlay; void syncPlayback(); });
+document.addEventListener('visibilitychange', () => { void syncPlayback(); });
+reduced.addEventListener('change', () => {
+  if (reduced.matches) wantsPlay = false;
+  void syncPlayback();
+});
+video.addEventListener('error', () => {
+  failed = true; ready = false; wantsPlay = false; play.disabled = true;
+  fallback('动作素材缺失或解码失败，回退静态人物；未通过动态验证。');
+  void syncPlayback();
+});
+
+async function init() {
+  try {
+    const response = await fetch('./assets/manifest.json');
+    if (!response.ok) throw new Error('manifest');
+    const manifest: Manifest = await response.json();
+    const motion = manifest.motion;
+    if (!motion.file || !motion.alpha) {
+      status.textContent = '静态分层可校对；无合格的透明动作素材，动态验收未通过。';
+      play.disabled = true; play.textContent = '真实动作尚不可用'; return;
+    }
+    video.src = `./assets/${motion.file}`;
+    video.addEventListener('loadeddata', () => {
+      ready = true; play.disabled = false;
+      status.textContent = `真实生成试片 · ${motion.status} · 循环切点与身份一致性以检查报告为准`;
+      paint(); void syncPlayback();
+    }, { once: true });
+  } catch {
+    fallback('素材清单不可用；保留静态分层校对。');
+    play.textContent = '真实动作尚不可用';
+  }
+}
+visibility(); layout(); void init();
diff --git a/samples/bedroom/src/style.css b/samples/bedroom/src/style.css
new file mode 100644
index 0000000..103b958
--- /dev/null
+++ b/samples/bedroom/src/style.css
@@ -0,0 +1,22 @@
+@import './tokens.css';
+* { box-sizing: border-box; }
+[hidden] { display: none !important; }
+body { margin: 0; background: var(--scene-night-deep); color: var(--ink-primary); font: var(--fs-body) var(--font-sans); }
+main { max-width: 1600px; margin: auto; }
+header, section { padding: var(--space-4) var(--space-6); }
+h1 { font-size: var(--fs-title); margin: 0; }
+p { color: var(--ink-secondary); line-height: 1.5; }
+#stage { position: relative; overflow: hidden; height: min(60vh, 640px); background: var(--glass-bg-strong); }
+#frame { position: absolute; width: 100%; height: 100%; }
+#environment, .layer { position: absolute; width: 100%; height: 100%; object-fit: contain; }
+#environment { filter: brightness(var(--demo-environment-brightness, 1)); }
+#motion { position: absolute; }
+fieldset { border: 1px solid var(--glass-border); border-radius: var(--r-control); padding: var(--space-3); display: flex; flex-wrap: wrap; gap: var(--space-4); }
+label, button { cursor: pointer; }
+.controls { display: flex; flex-wrap: wrap; gap: var(--space-2); margin-top: var(--space-3); }
+button { color: var(--ink-primary); background: var(--glass-bg-strong); border: 1px solid var(--glass-highlight); border-radius: var(--r-control); padding: var(--space-3) var(--space-4); font: inherit; }
+button[aria-pressed=true] { border-color: var(--accent); }
+button:disabled { color: var(--ink-disabled); cursor: default; }
+button:focus-visible, input:focus-visible { outline: 2px solid var(--accent); outline-offset: 2px; }
+output { font-variant-numeric: tabular-nums; color: var(--accent); }
+@media (max-width: 600px) { header, section { padding: var(--space-3); } #stage { height: 38vh; } }
diff --git a/samples/bedroom/src/tokens.css b/samples/bedroom/src/tokens.css
new file mode 100644
index 0000000..e42ddd6
--- /dev/null
+++ b/samples/bedroom/src/tokens.css
@@ -0,0 +1,73 @@
+/* Reused verbatim from hel-700-rain-room; no alternative product theme. */
+:root {
+  --scene-night-deep:#16233c;
+  --scene-city-blue:#305481;
+  --scene-city-mid:#5a76a2;
+  --scene-tower:#2b456b;
+  --scene-glass-blue:#718fc2;
+  --scene-amber:#e8a45c;
+  --scene-amber-soft:#f2c894;
+  --scene-wood:#59361d;
+  --scene-cream:#e8d9c8;
+  --scene-blanket:#362928;
+  --ink-primary:#f2efe9;
+  --ink-secondary:rgba(242,239,233,.64);
+  --ink-tertiary:rgba(242,239,233,.4);
+  --ink-disabled:rgba(242,239,233,.28);
+  --accent:#e8a45c;
+  --accent-hover:#f2b879;
+  --accent-pressed:#c9853f;
+  --accent-ink:#1a1208;
+  --glass-bg:rgba(14,18,30,.55);
+  --glass-bg-strong:rgba(14,18,30,.72);
+  --glass-border:rgba(255,255,255,.08);
+  --glass-highlight:rgba(255,255,255,.14);
+  --bubble-user:rgba(120,144,180,.2);
+  --bubble-user-border:rgba(255,255,255,.07);
+  --bubble-her:rgba(255,255,255,.06);
+  --bubble-failed:rgba(200,90,80,.14);
+  --state-danger:#e07a6a;
+  --font-sans:"PingFang SC","HarmonyOS Sans SC","MiSans","Source Han Sans SC",system-ui,-apple-system,sans-serif;
+  --fs-caption:12px;
+  --fs-small:13px;
+  --fs-body:14px;
+  --fs-chat:15px;
+  --fs-nav:15px;
+  --fs-title:20px;
+  --fs-brand:16px;
+  --fs-time:13px;
+  --space-1:4px;
+  --space-2:8px;
+  --space-3:12px;
+  --space-4:16px;
+  --space-5:20px;
+  --space-6:24px;
+  --space-8:32px;
+  --space-10:40px;
+  --r-panel:24px;
+  --r-bubble:16px;
+  --r-card:16px;
+  --r-control:12px;
+  --r-pill:999px;
+  --shadow-panel:0 24px 80px rgba(0,0,0,.45);
+  --shadow-pop:0 8px 24px rgba(0,0,0,.35);
+  --glow-accent:0 0 12px rgba(232,164,92,.45);
+  --glass-blur:blur(28px) saturate(1.2);
+  --z-scene-far:0;
+  --z-scene-rain:1;
+  --z-scene-near:2;
+  --z-caption:10;
+  --z-nav:10;
+  --z-topbar:20;
+  --z-panel:30;
+  --z-toast:40;
+  --ease-out:cubic-bezier(.23,1,.32,1);
+  --ease-in-out:cubic-bezier(.77,0,.175,1);
+  --ease-drawer:cubic-bezier(.32,.72,0,1);
+  --lamp-opacity:.12;
+  --panel-width:clamp(360px,30vw,460px);
+  --panel-top:64px;
+  --panel-inset:24px;
+  --scene-height:330px;
+  --drawer-height:30dvh;
+}
\ No newline at end of file
diff --git a/samples/bedroom/tools/browser_check.py b/samples/bedroom/tools/browser_check.py
new file mode 100644
index 0000000..3b6aef9
--- /dev/null
+++ b/samples/bedroom/tools/browser_check.py
@@ -0,0 +1,158 @@
+"""Foreground Chromium interaction checks, screenshots and downloadable recording."""
+import functools
+import http.server
+import json
+import threading
+from pathlib import Path
+
+from playwright.sync_api import sync_playwright
+
+ROOT = Path(__file__).resolve().parents[1]
+EVIDENCE = ROOT / 'evidence'
+
+
+class Quiet(http.server.SimpleHTTPRequestHandler):
+    def log_message(self, *_args):
+        pass
+
+
+def main():
+    EVIDENCE.mkdir(exist_ok=True)
+    handler = functools.partial(Quiet, directory=str(ROOT / 'dist'))
+    server = http.server.ThreadingHTTPServer(('127.0.0.1', 0), handler)
+    thread = threading.Thread(target=server.serve_forever)
+    thread.start()
+    results = {}
+    try:
+        with sync_playwright() as p:
+            browser = p.chromium.launch()
+            url = f'http://127.0.0.1:{server.server_port}'
+            context = browser.new_context(viewport={'width': 1280, 'height': 800},
+                                          record_video_dir=str(EVIDENCE),
+                                          record_video_size={'width': 1280, 'height': 800})
+            page = context.new_page()
+            errors = []
+            page.on('pageerror', lambda error: errors.append(str(error)))
+            page.goto(url)
+            page.wait_for_function('!document.querySelector("#play").disabled')
+            assert page.locator('#source').evaluate('(v) => v.paused')
+            page.click('#play')
+            # Keep every layer visible for three full cycles before interaction checks.
+            duration = page.locator('#source').evaluate('(v) => v.duration')
+            page.evaluate("""() => {
+              window.observedLoops = []; window.lastVideoTime = 0;
+              const v = document.querySelector('#source');
+              v.addEventListener('timeupdate', () => {
+                if (v.currentTime < window.lastVideoTime) window.observedLoops.push(performance.now());
+                window.lastVideoTime = v.currentTime;
+              });
+            }""")
+            page.wait_for_timeout((duration * 3 + 0.8) * 1000)
+            observed = page.evaluate('window.observedLoops')
+            assert len(observed) >= 3, observed
+            results['continuous_three_cycles'] = {'duration': duration, 'wraps_ms': observed}
+            page.wait_for_timeout(800)
+            alpha = page.locator('#motion').evaluate('(c) => {const x=c.getContext("2d"); return [x.getImageData(0,0,1,1).data[3], x.getImageData(300,220,1,1).data[3]]}')
+            assert alpha[0] == 0 and alpha[1] > 240, alpha
+            results['vp9_alpha_decoded_by_chromium'] = alpha
+            page.wait_for_function('document.querySelector("#source").currentTime > 0.9 && document.querySelector("#source").currentTime < 1.4')
+            positions = page.evaluate('''() => {
+              const video=document.querySelector('#source'); const before=video.currentTime;
+              const source=video.currentSrc; document.querySelector('#lighting').click();
+              return {before, after:video.currentTime, sourcePreserved: source===video.currentSrc};
+            }''')
+            assert positions['before'] == positions['after'] and positions['sourcePreserved']
+            results['environment_toggle_no_seek'] = positions
+            page.wait_for_timeout(650)
+            assert page.locator('#source').evaluate('(v) => !v.paused')
+            page.click('#show-person')
+            assert page.locator('#motion').is_hidden() and page.locator('#person').is_hidden()
+            page.wait_for_timeout(600)
+            page.screenshot(path=str(EVIDENCE / 'environment-only.png'))
+            page.click('#show-person')
+            page.click('#show-occlusion')
+            assert page.locator('#occlusion').is_hidden()
+            page.click('#show-occlusion')
+            page.click('#show-shadow')
+            assert page.locator('#shadow').is_hidden()
+            page.click('#show-shadow')
+            page.click('#show-mask')
+            assert page.locator('#mask').is_visible() and page.locator('#environment').is_hidden()
+            page.wait_for_timeout(500)
+            page.click('#show-mask')
+            results['independent_layers'] = True
+            page.click('#closeup')
+            assert page.locator('#talk').is_visible()
+            assert page.locator('#source').evaluate('(v) => !v.paused')
+            page.wait_for_timeout(700)
+            page.screenshot(path=str(EVIDENCE / 'static-near.png'))
+            page.click('#closeup')
+            assert page.locator('#talk').is_hidden()
+            page.wait_for_timeout(6400)  # Includes the forward and generated return.
+            results['near_is_static_player_continues'] = True
+            page.click('#play')
+            t = page.locator('#source').evaluate('(v) => v.currentTime')
+            page.wait_for_timeout(250)
+            assert page.locator('#source').evaluate('(v) => v.currentTime') == t
+            results['manual_pause'] = True
+            # Chromium lifecycle API freezes the page after making it hidden.
+            session = context.new_cdp_session(page)
+            session.send('Page.setWebLifecycleState', {'state': 'active'})
+            # Visibility handler unit probe. Browser screenshot/recording checks above are real.
+            page.click('#play')
+            page.evaluate('''() => {
+              Object.defineProperty(document, 'hidden', {configurable:true, get:()=>true});
+              document.dispatchEvent(new Event('visibilitychange'));
+            }''')
+            assert page.locator('#source').evaluate('(v) => v.paused')
+            page.evaluate('''() => {
+              delete document.hidden; document.dispatchEvent(new Event('visibilitychange'));
+            }''')
+            page.wait_for_function('!document.querySelector("#source").paused')
+            results['visibility_pause_resume_handler_synthetic_event'] = True
+            for width, height in [(1600, 900), (1280, 800), (390, 844)]:
+                page.set_viewport_size({'width': width, 'height': height})
+                page.wait_for_timeout(180)
+                bounds = page.evaluate('''() => {
+                  const r=document.querySelector('#motion').getBoundingClientRect();
+                  const s=document.querySelector('#stage').getBoundingClientRect();
+                  return {faceX:r.x+305/552*r.width, faceY:r.y+135/552*r.height,
+                    stage:{left:s.left,right:s.right,top:s.top,bottom:s.bottom},
+                    scroll:document.documentElement.scrollWidth, width:innerWidth};
+                }''')
+                assert bounds['scroll'] <= width
+                assert bounds['stage']['left'] <= bounds['faceX'] <= bounds['stage']['right']
+                assert bounds['stage']['top'] <= bounds['faceY'] <= bounds['stage']['bottom']
+                page.screenshot(path=str(EVIDENCE / f'viewport-{width}x{height}.png'))
+                results[f'viewport_{width}x{height}'] = bounds
+            page.emulate_media(reduced_motion='reduce')
+            page.wait_for_timeout(100)
+            assert page.locator('#source').evaluate('(v) => v.paused')
+            assert page.locator('#person').is_visible() and page.locator('#motion').is_hidden()
+            results['reduced_motion_static_fallback'] = True
+            page.emulate_media(reduced_motion='no-preference')
+            assert page.locator('#source').evaluate('(v) => v.paused')
+            video_path = Path(page.video.path())
+            context.close()
+            video_path.rename(EVIDENCE / 'browser-continuous.webm')
+            missing = browser.new_page()
+            missing.route('**/reading-alpha.webm', lambda route: route.abort())
+            missing.goto(url)
+            missing.wait_for_function('!document.querySelector("#fallback").hidden')
+            assert missing.locator('#person').is_visible()
+            assert missing.locator('#play').is_disabled()
+            results['missing_motion_static_fallback'] = True
+            missing.close()
+            assert not errors, errors
+            results['page_errors'] = errors
+            browser.close()
+    finally:
+        server.shutdown()
+        thread.join()
+        server.server_close()
+    (EVIDENCE / 'browser-results.json').write_text(json.dumps(results, ensure_ascii=False, indent=2))
+    print(json.dumps(results, ensure_ascii=False, indent=2))
+
+
+if __name__ == '__main__':
+    main()
diff --git a/samples/bedroom/tools/contact_layers.py b/samples/bedroom/tools/contact_layers.py
new file mode 100644
index 0000000..f866b05
--- /dev/null
+++ b/samples/bedroom/tools/contact_layers.py
@@ -0,0 +1,33 @@
+"""Reproduce the separately switchable foreground and provisional contact shadow."""
+from pathlib import Path
+
+from PIL import Image, ImageDraw, ImageFilter
+
+
+def main():
+    assets = Path(__file__).resolve().parents[1] / 'public/assets'
+    source = Image.open(assets / 'reference.png').convert('RGBA')
+    mask = Image.new('L', source.size)
+    ImageDraw.Draw(mask).polygon([
+        (1240, 582), (1282, 566), (1316, 556), (1360, 552), (1403, 532),
+        (1438, 526), (1486, 514), (1517, 521), (1539, 544), (1559, 556),
+        (1565, 634), (1520, 707), (1407, 747), (1260, 703), (1227, 650),
+    ], fill=255)
+    mask = mask.filter(ImageFilter.GaussianBlur(1))
+    source.putalpha(mask)
+    source.save(assets / 'occlusion.png')
+    mask.save(assets / 'occlusion-mask.png')
+    mask = Image.new('L', source.size)
+    ImageDraw.Draw(mask).ellipse((1230, 511, 1512, 595), fill=65)
+    mask = mask.filter(ImageFilter.GaussianBlur(12))
+    shadow = Image.new('RGBA', source.size, (44, 28, 20, 0))
+    shadow.putalpha(mask)
+    shadow.save(assets / 'contact-shadow.png')
+    composite = Image.open(assets / 'environment.png').convert('RGBA')
+    for name in ['contact-shadow.png', 'person.png', 'occlusion.png']:
+        composite = Image.alpha_composite(composite, Image.open(assets / name))
+    composite.save(assets / 'composite.png')
+
+
+if __name__ == '__main__':
+    main()
diff --git a/samples/bedroom/tools/extract_layers.py b/samples/bedroom/tools/extract_layers.py
new file mode 100644
index 0000000..e530049
--- /dev/null
+++ b/samples/bedroom/tools/extract_layers.py
@@ -0,0 +1,79 @@
+"""Use installed SAM modeling modules directly; no predictor/OpenCV dependency.
+
+Run in the existing ComfyUI venv. No downloads or dependency changes.
+"""
+import argparse
+import importlib
+import sys
+import types
+from pathlib import Path
+
+import numpy as np
+import torch
+from PIL import Image, ImageChops, ImageDraw, ImageFilter
+
+
+def load_sam(source: Path, checkpoint: Path):
+    # The optional predictor package imports cv2. We only use the original model API.
+    package = types.ModuleType("hel711_sam")
+    package.__path__ = [str(source)]
+    sys.modules[package.__name__] = package
+    builder = importlib.import_module("hel711_sam.build_sam")
+    return builder.build_sam_vit_b(str(checkpoint)).eval()
+
+
+def segment(model, image, extra_positive=()):
+    width, height = image.size
+    scale = 1024 / max(width, height)
+    size = (round(width * scale), round(height * scale))
+    tensor = torch.from_numpy(np.array(image.resize(size))).permute(2, 0, 1).to(model.device)
+    # Crop coordinate system: fixed right-hand seat, 552 x 552.
+    points = torch.tensor([[[305, 140], [300, 245], [200, 300], [307, 301],
+                            [80, 100], [450, 400], [330, 450]]], dtype=torch.float)
+    if extra_positive:
+        extra = torch.tensor([extra_positive], dtype=torch.float)
+        points = torch.cat((points, extra), dim=1)
+    points = (points * scale).to(model.device)
+    labels = torch.tensor([[1, 1, 1, 1, 0, 0, 0]], device=model.device)
+    if extra_positive:
+        labels = torch.cat((labels, torch.ones((1, len(extra_positive)), device=model.device)), dim=1)
+    box = torch.tensor([[100, 60, 420, 380]], dtype=torch.float, device=model.device) * scale
+    with torch.inference_mode():
+        result = model([dict(image=tensor, original_size=(height, width),
+                             point_coords=points, point_labels=labels, boxes=box)],
+                       multimask_output=False)[0]
+    mask = result['masks'][0, 0].cpu().numpy().astype(np.uint8) * 255
+    mask = Image.fromarray(mask)
+    # The book/knit texture produces enclosed SAM holes. Fill enclosed holes only.
+    exterior = mask.copy()
+    ImageDraw.floodfill(exterior, (0, 0), 255)
+    mask = ImageChops.lighter(mask, ImageChops.invert(exterior))
+    return mask.filter(ImageFilter.GaussianBlur(0.65))
+
+
+def main():
+    parser = argparse.ArgumentParser()
+    parser.add_argument('assets', type=Path)
+    parser.add_argument('--sam-source', type=Path, required=True)
+    parser.add_argument('--checkpoint', type=Path, required=True)
+    args = parser.parse_args()
+    torch.set_num_threads(8)
+    model = load_sam(args.sam_source, args.checkpoint)
+    source = Image.open(args.assets / 'reference.png').convert('RGB')
+    region = (1120, 200, 1672, 752)
+    crop = source.crop(region)
+    mask = segment(model, crop)
+    full_mask = Image.new('L', source.size)
+    full_mask.paste(mask, region[:2])
+    full_mask.save(args.assets / 'person-mask.png')
+    layer = source.convert('RGBA')
+    layer.putalpha(full_mask)
+    layer.save(args.assets / 'person.png')
+    crop.save(args.assets / 'generation-input.png')
+    environment = Image.open(args.assets / 'environment.png').convert('RGBA')
+    Image.alpha_composite(environment, layer).save(args.assets / 'composite.png')
+    print('Saved original-pixel person layer, SAM mask, crop and real composite.', flush=True)
+
+
+if __name__ == '__main__':
+    main()
diff --git a/samples/bedroom/tools/generate_once.py b/samples/bedroom/tools/generate_once.py
new file mode 100644
index 0000000..63cc64b
--- /dev/null
+++ b/samples/bedroom/tools/generate_once.py
@@ -0,0 +1,141 @@
+"""One foreground job using the installed ComfyUI native Wan nodes.
+
+Owns and stops its exact server PID in finally. Does not modify the installation.
+"""
+import json
+import os
+import subprocess
+import time
+import urllib.error
+import urllib.request
+from pathlib import Path
+
+ROOT = Path('/media/lucian/Downloads/ComfyUI')
+TASK = ROOT / 'output/hel711-task'
+URL = 'http://127.0.0.1:18189'
+
+
+def request(path, payload=None):
+    data = None if payload is None else json.dumps(payload).encode()
+    req = urllib.request.Request(URL + path, data=data,
+                                 headers={'Content-Type': 'application/json'})
+    with urllib.request.urlopen(req, timeout=20) as response:
+        return json.load(response)
+
+
+def graph():
+    nodes = {}
+
+    def add(key, kind, **inputs):
+        nodes[str(key)] = dict(class_type=kind, inputs=inputs)
+
+    for key, mode in [(1, 'high'), (2, 'low')]:
+        add(key, 'UNETLoader', unet_name=f'wan2.2_i2v_{mode}_noise_14B_fp8_scaled.safetensors',
+            weight_dtype='default')
+        add(key + 2, 'LoraLoaderModelOnly', model=[str(key), 0],
+            lora_name=f'wan2.2_i2v_lightx2v_4steps_lora_v1_{mode}_noise.safetensors',
+            strength_model=1.0)
+        add(key + 4, 'ModelSamplingSD3', model=[str(key + 2), 0], shift=5.0)
+    add(7, 'CLIPLoader', clip_name='umt5_xxl_fp8_e4m3fn_scaled.safetensors',
+        type='wan', device='cpu')
+    add(8, 'VAELoader', vae_name='wan_2.1_vae.safetensors')
+    add(9, 'LoadImage', image='generation-input.png')
+    add(10, 'CLIPTextEncode', clip=['7', 0], text=(
+        'Locked off camera, photorealistic young adult woman with short dark hair, '
+        'cream cardigan and dark trousers seated on the same sofa in the same bedroom. '
+        'She quietly reads the book in her hands, slowly lowers her gaze to the page '
+        'then gently raises her head a little. Small natural eye blink and breathing. '
+        'Her hands keep holding the book. Fixed seat position, stationary room and furniture.'))
+    add(11, 'CLIPTextEncode', clip=['7', 0],
+        text='camera movement, zoom, changing face, changing clothes, standing up, '
+             'extra fingers, distorted hands, deformed face, moving furniture, subtitles')
+    add(12, 'WanImageToVideo', positive=['10', 0], negative=['11', 0], vae=['8', 0],
+        width=512, height=512, length=49, batch_size=1, start_image=['9', 0])
+    add(13, 'KSamplerAdvanced', model=['5', 0], add_noise='enable', noise_seed=711,
+        steps=4, cfg=1.0, sampler_name='euler', scheduler='simple',
+        positive=['12', 0], negative=['12', 1], latent_image=['12', 2],
+        start_at_step=0, end_at_step=2, return_with_leftover_noise='enable')
+    add(14, 'KSamplerAdvanced', model=['6', 0], add_noise='disable', noise_seed=711,
+        steps=4, cfg=1.0, sampler_name='euler', scheduler='simple',
+        positive=['12', 0], negative=['12', 1], latent_image=['13', 0],
+        start_at_step=2, end_at_step=4, return_with_leftover_noise='disable')
+    add(15, 'VAEDecode', samples=['14', 0], vae=['8', 0])
+    add(16, 'SaveWEBM', images=['15', 0], codec='vp9', fps=16.0,
+        filename_prefix='reading', crf=20.0)
+    return nodes
+
+
+def main():
+    for name in ['user', 'temp']:
+        (TASK / name).mkdir(exist_ok=True)
+    os.environ['HF_HUB_OFFLINE'] = '1'
+    os.environ['TRANSFORMERS_OFFLINE'] = '1'
+    command = [str(ROOT / 'venv/bin/python'), str(ROOT / 'main.py'),
+               '--listen', '127.0.0.1', '--port', '18189', '--disable-all-custom-nodes',
+               '--offline', '--disable-manager-ui', '--disable-assets',
+               '--reserve-vram', '8', '--disable-dynamic-vram',
+               '--input-directory', str(TASK / 'assets'),
+               '--output-directory', str(TASK), '--user-directory', str(TASK / 'user'),
+               '--temp-directory', str(TASK / 'temp'), '--database-url', 'sqlite:///:memory:']
+    # Refuse to attach to an unrelated listener.
+    import socket
+    with socket.socket() as sock:
+        if sock.connect_ex(('127.0.0.1', 18189)) == 0:
+            raise RuntimeError('Task port already occupied; no process started')
+    with open(TASK / 'server.log', 'w') as log:
+        server = subprocess.Popen(command, cwd=ROOT, stdout=log, stderr=subprocess.STDOUT)
+        (TASK / 'process.json').write_text(json.dumps(dict(pid=server.pid, command=command)))
+        try:
+            deadline = time.monotonic() + 90
+            while True:
+                if server.poll() is not None:
+                    raise RuntimeError(f'ComfyUI exited: {server.returncode}; see server.log')
+                try:
+                    info = request('/object_info')
+                    break
+                except (OSError, urllib.error.URLError):
+                    if time.monotonic() > deadline:
+                        raise TimeoutError('Startup exceeded 90 seconds') from None
+                    time.sleep(1)
+            workflow = graph()
+            (TASK / 'workflow.json').write_text(json.dumps(workflow, indent=2))
+            required = {n['class_type']: info.get(n['class_type']) for n in workflow.values()}
+            (TASK / 'nodes.json').write_text(json.dumps(required, indent=2))
+            if any(v is None for v in required.values()):
+                raise RuntimeError('Required native node unavailable; see nodes.json')
+            result = request('/prompt', {'prompt': workflow})
+            (TASK / 'submission.json').write_text(json.dumps(result))
+            prompt_id = result['prompt_id']
+            print(f'Generating one clip: {prompt_id}; owned server PID {server.pid}', flush=True)
+            deadline = time.monotonic() + 2400
+            last_report = 0
+            while time.monotonic() < deadline:
+                history = request('/history/' + prompt_id)
+                if prompt_id in history:
+                    (TASK / 'history.json').write_text(json.dumps(history, indent=2))
+                    print(json.dumps(history[prompt_id]['status']), flush=True)
+                    if history[prompt_id]['status']['status_str'] != 'success':
+                        raise RuntimeError('Generation failed; see history.json')
+                    break
+                if time.monotonic() - last_report > 30:
+                    print('Single generation still active; existing services untouched.', flush=True)
+                    last_report = time.monotonic()
+                time.sleep(3)
+            else:
+                request('/interrupt', {})
+                raise TimeoutError('Single generation exceeded 40 minutes')
+        except urllib.error.HTTPError as error:
+            (TASK / 'api-error.json').write_bytes(error.read())
+            raise
+        finally:
+            server.terminate()
+            try:
+                server.wait(timeout=20)
+            except subprocess.TimeoutExpired:
+                server.kill()
+                server.wait()
+            print(f'Stopped owned server PID {server.pid}', flush=True)
+
+
+if __name__ == '__main__':
+    main()
diff --git a/samples/bedroom/tools/generate_return.py b/samples/bedroom/tools/generate_return.py
new file mode 100644
index 0000000..cfc8fd8
--- /dev/null
+++ b/samples/bedroom/tools/generate_return.py
@@ -0,0 +1,149 @@
+"""Generate one conditioned return, from original frame 48 back to frame 0.
+
+Owns and stops its exact server PID in finally. Does not modify the installation.
+"""
+import json
+import os
+import subprocess
+import time
+import urllib.error
+import urllib.request
+from pathlib import Path
+
+ROOT = Path('/media/lucian/Downloads/ComfyUI')
+TASK = ROOT / 'output/hel712-task'
+URL = 'http://127.0.0.1:18189'
+
+
+def request(path, payload=None):
+    data = None if payload is None else json.dumps(payload).encode()
+    req = urllib.request.Request(URL + path, data=data,
+                                 headers={'Content-Type': 'application/json'})
+    with urllib.request.urlopen(req, timeout=20) as response:
+        return json.load(response)
+
+
+def graph():
+    nodes = {}
+
+    def add(key, kind, **inputs):
+        nodes[str(key)] = dict(class_type=kind, inputs=inputs)
+
+    for key, mode in [(1, 'high'), (2, 'low')]:
+        add(key, 'UNETLoader', unet_name=f'wan2.2_i2v_{mode}_noise_14B_fp8_scaled.safetensors',
+            weight_dtype='default')
+        add(key + 2, 'LoraLoaderModelOnly', model=[str(key), 0],
+            lora_name=f'wan2.2_i2v_lightx2v_4steps_lora_v1_{mode}_noise.safetensors',
+            strength_model=1.0)
+        add(key + 4, 'ModelSamplingSD3', model=[str(key + 2), 0], shift=5.0)
+    add(7, 'CLIPLoader', clip_name='umt5_xxl_fp8_e4m3fn_scaled.safetensors',
+        type='wan', device='cpu')
+    add(8, 'VAELoader', vae_name='wan_2.1_vae.safetensors')
+    add(9, 'LoadImage', image='return-start.png')
+    add(17, 'LoadImage', image='return-end.png')
+    add(10, 'CLIPTextEncode', clip=['7', 0], text=(
+        'Locked off camera, photorealistic young adult woman with short dark hair, '
+        'cream cardigan and dark trousers seated on the same sofa in the same bedroom. '
+        'She slowly and smoothly raises her head from looking down at the book, '
+        'returning to the exact relaxed head pose and eye direction in the final reference. '
+        'Her hands keep holding the open book without moving it. Natural continuous breathing. '
+        'Fixed seat position, stationary room and furniture, identical face and outfit.'))
+    add(11, 'CLIPTextEncode', clip=['7', 0],
+        text='camera movement, zoom, changing face, changing clothes, standing up, '
+             'extra fingers, distorted hands, deformed face, moving furniture, subtitles')
+    add(12, 'WanFirstLastFrameToVideo', positive=['10', 0], negative=['11', 0], vae=['8', 0],
+        width=512, height=512, length=49, batch_size=1, start_image=['9', 0], end_image=['17', 0])
+    add(13, 'KSamplerAdvanced', model=['5', 0], add_noise='enable', noise_seed=712,
+        steps=4, cfg=1.0, sampler_name='euler', scheduler='simple',
+        positive=['12', 0], negative=['12', 1], latent_image=['12', 2],
+        start_at_step=0, end_at_step=2, return_with_leftover_noise='enable')
+    add(14, 'KSamplerAdvanced', model=['6', 0], add_noise='disable', noise_seed=712,
+        steps=4, cfg=1.0, sampler_name='euler', scheduler='simple',
+        positive=['12', 0], negative=['12', 1], latent_image=['13', 0],
+        start_at_step=2, end_at_step=4, return_with_leftover_noise='disable')
+    add(15, 'VAEDecode', samples=['14', 0], vae=['8', 0])
+    add(16, 'SaveWEBM', images=['15', 0], codec='vp9', fps=16.0,
+        filename_prefix='return', crf=20.0)
+    return nodes
+
+
+def main():
+    import av
+    (TASK / 'assets').mkdir(parents=True, exist_ok=True)
+    with av.open(str(ROOT / 'output/hel711-task/reading_00001_.webm')) as source:
+        frames = [frame.to_image() for frame in source.decode(video=0)]
+    frames[-1].save(TASK / 'assets/return-start.png')
+    frames[0].save(TASK / 'assets/return-end.png')
+    for name in ['user', 'temp']:
+        (TASK / name).mkdir(exist_ok=True)
+    os.environ['HF_HUB_OFFLINE'] = '1'
+    os.environ['TRANSFORMERS_OFFLINE'] = '1'
+    command = [str(ROOT / 'venv/bin/python'), str(ROOT / 'main.py'),
+               '--listen', '127.0.0.1', '--port', '18189', '--disable-all-custom-nodes',
+               '--offline', '--disable-manager-ui', '--disable-assets',
+               '--reserve-vram', '8', '--disable-dynamic-vram',
+               '--input-directory', str(TASK / 'assets'),
+               '--output-directory', str(TASK), '--user-directory', str(TASK / 'user'),
+               '--temp-directory', str(TASK / 'temp'), '--database-url', 'sqlite:///:memory:']
+    # Refuse to attach to an unrelated listener.
+    import socket
+    with socket.socket() as sock:
+        if sock.connect_ex(('127.0.0.1', 18189)) == 0:
+            raise RuntimeError('Task port already occupied; no process started')
+    with open(TASK / 'server.log', 'w') as log:
+        server = subprocess.Popen(command, cwd=ROOT, stdout=log, stderr=subprocess.STDOUT)
+        (TASK / 'process.json').write_text(json.dumps(dict(pid=server.pid, command=command)))
+        try:
+            deadline = time.monotonic() + 90
+            while True:
+                if server.poll() is not None:
+                    raise RuntimeError(f'ComfyUI exited: {server.returncode}; see server.log')
+                try:
+                    info = request('/object_info')
+                    break
+                except (OSError, urllib.error.URLError):
+                    if time.monotonic() > deadline:
+                        raise TimeoutError('Startup exceeded 90 seconds') from None
+                    time.sleep(1)
+            workflow = graph()
+            (TASK / 'workflow.json').write_text(json.dumps(workflow, indent=2))
+            required = {n['class_type']: info.get(n['class_type']) for n in workflow.values()}
+            (TASK / 'nodes.json').write_text(json.dumps(required, indent=2))
+            if any(v is None for v in required.values()):
+                raise RuntimeError('Required native node unavailable; see nodes.json')
+            result = request('/prompt', {'prompt': workflow})
+            (TASK / 'submission.json').write_text(json.dumps(result))
+            prompt_id = result['prompt_id']
+            print(f'Generating one clip: {prompt_id}; owned server PID {server.pid}', flush=True)
+            deadline = time.monotonic() + 2400
+            last_report = 0
+            while time.monotonic() < deadline:
+                history = request('/history/' + prompt_id)
+                if prompt_id in history:
+                    (TASK / 'history.json').write_text(json.dumps(history, indent=2))
+                    print(json.dumps(history[prompt_id]['status']), flush=True)
+                    if history[prompt_id]['status']['status_str'] != 'success':
+                        raise RuntimeError('Generation failed; see history.json')
+                    break
+                if time.monotonic() - last_report > 30:
+                    print('Single generation still active; existing services untouched.', flush=True)
+                    last_report = time.monotonic()
+                time.sleep(3)
+            else:
+                request('/interrupt', {})
+                raise TimeoutError('Single generation exceeded 40 minutes')
+        except urllib.error.HTTPError as error:
+            (TASK / 'api-error.json').write_bytes(error.read())
+            raise
+        finally:
+            server.terminate()
+            try:
+                server.wait(timeout=20)
+            except subprocess.TimeoutExpired:
+                server.kill()
+                server.wait()
+            print(f'Stopped owned server PID {server.pid}', flush=True)
+
+
+if __name__ == '__main__':
+    main()
diff --git a/samples/bedroom/tools/matte_video.py b/samples/bedroom/tools/matte_video.py
new file mode 100644
index 0000000..1654818
--- /dev/null
+++ b/samples/bedroom/tools/matte_video.py
@@ -0,0 +1,59 @@
+"""Per-frame real SAM segmentation, then VP9 alpha encoding with existing PyAV."""
+import json
+from pathlib import Path
+
+import av
+import numpy as np
+import torch
+from extract_layers import load_sam, segment
+from PIL import Image
+
+ROOT = Path('/media/lucian/Downloads/ComfyUI')
+TASK = ROOT / 'output/hel711-task'
+
+
+def main():
+    torch.set_num_threads(8)
+    model = load_sam(
+        ROOT / 'custom_nodes/was-node-suite-comfyui/repos/SAM/segment_anything',
+        ROOT / 'models/sams/sam_vit_b_01ec64.pth').to('cuda')
+    output = av.open(str(TASK / 'reading-alpha.webm'), 'w')
+    stream = output.add_stream('libvpx-vp9', rate=16)
+    stream.width = 552
+    stream.height = 552
+    stream.pix_fmt = 'yuva420p'
+    stream.options = {'crf': '20', 'b': '0', 'auto-alt-ref': '0'}
+    metrics = []
+    previews = []
+    source = av.open(str(TASK / 'reading_00001_.webm'))
+    previous = None
+    first = None
+    for index, decoded in enumerate(source.decode(video=0)):
+        image = decoded.to_image().resize((552, 552), Image.Resampling.LANCZOS)
+        mask = segment(model, image)
+        frame = image.convert('RGBA')
+        frame.putalpha(mask)
+        pixels = np.array(image).astype(float)
+        if first is None:
+            first = pixels
+        metrics.append(dict(frame=index, mask_pixels=int((np.array(mask) > 127).sum()),
+                            mean_absolute_rgb_change=0 if previous is None else float(np.abs(pixels-previous).mean())))
+        previous = pixels
+        if index in [0, 16, 32, 48]:
+            previews.append(frame)
+            frame.save(TASK / f'matted-{index:02}.png')
+        for packet in stream.encode(av.VideoFrame.from_ndarray(np.array(frame), format='rgba')):
+            output.mux(packet)
+        if index % 16 == 0:
+            print(f'Matted frame {index}', flush=True)
+    for packet in stream.encode():
+        output.mux(packet)
+    output.close()
+    source.close()
+    (TASK / 'frame-metrics.json').write_text(json.dumps(dict(
+        frames=metrics, loop_rgb_difference=float(np.abs(previous-first).mean()),
+        interpretation='Real generated frames; RGB differences alone are not proof of valid anatomy or identity.'), indent=2))
+
+
+if __name__ == '__main__':
+    main()
diff --git a/samples/bedroom/tools/measure_loop.py b/samples/bedroom/tools/measure_loop.py
new file mode 100644
index 0000000..1c0c7a8
--- /dev/null
+++ b/samples/bedroom/tools/measure_loop.py
@@ -0,0 +1,106 @@
+"""Measure all joins and before/after hand mattes; export reviewable frame evidence."""
+import json
+from pathlib import Path
+
+import av
+import numpy as np
+from PIL import Image, ImageDraw
+from scipy.ndimage import binary_erosion, map_coordinates
+from skimage.color import rgb2gray
+from skimage.registration import optical_flow_tvl1
+
+TASK = Path('/media/lucian/Downloads/ComfyUI/output/hel712-task')
+
+
+def summary(values):
+    a = np.array(values)
+    return dict(min=float(a.min()), median=float(np.median(a)),
+                p95=float(np.percentile(a, 95)), max=float(a.max()))
+
+
+def panel(images, labels, path, size=(256, 256), columns=6):
+    width, height = size
+    board = Image.new('RGB', (columns*width, ((len(images)+columns-1)//columns)*(height+22)), '#202020')
+    draw = ImageDraw.Draw(board)
+    for i, (image, label) in enumerate(zip(images, labels, strict=True)):
+        x, y = i % columns*width, i // columns*(height+22)
+        board.paste(image.resize(size), (x, y))
+        draw.text((x+3, y+height+3), label, fill='white')
+    board.save(path)
+
+
+def main():
+    data = np.load(TASK/'segmentation-v2.npz')
+    mattes = np.load(TASK/'mattes.npz')
+    rgb = data['images']
+    # All measurement uses 512px source coordinates. The head box is fixed for both clips.
+    images = [np.array(Image.fromarray(x).resize((512,512))) for x in rgb]
+    before, after = [[np.array(Image.fromarray(x).resize((512,512))) > 127
+                      for x in mattes[key]] for key in ['before','after']]
+    head = [x[50:180,230:340].astype(float) for x in images]
+    pairs = [(i, i+1) for i in range(97)] + [(97,0)]
+    head_diff = [float(np.abs(head[a]-head[b]).mean()) for a,b in pairs]
+    ordinary = [d for i,d in enumerate(head_diff) if i not in [48,97]]
+    report = {'coordinates':'512x512, head x230:340 y50:180, book/hand all x y175:330',
+              'original_head_adjacent':summary(head_diff[:48]),
+              'original_head_seam':float(np.abs(head[48]-head[0]).mean()),
+              'loop_ordinary_head':summary(ordinary),
+              'joins':[{'pair':[48,49],'head_mae':head_diff[48]},
+                       {'pair':[97,0],'head_mae':head_diff[97]}],
+              'head_mae_all_pairs':head_diff}
+    for name, masks in [('before',before),('after',after)]:
+        edge = [int((m & ~binary_erosion(m))[175:330].sum()) for m in masks]
+        switches = [int((masks[a]^masks[b])[175:330].sum()) for a,b in pairs]
+        report[name] = {'boundary_pixels': edge, 'switch_pixels':switches,
+                        'original49_boundary':summary(edge[:49]),
+                        'original49_boundary_jump':summary(np.abs(np.diff(edge[:49]))),
+                        'original49_switch':summary(switches[:48]),
+                        'all_boundary':summary(edge), 'all_boundary_jump':summary(np.abs(np.diff(edge + [edge[0]]))),
+                        'all_switch':summary(switches),
+                        'joins_switch':[switches[48],switches[97]]}
+    # Warp both alpha candidates with the same image motion. Residuals separate
+    # mask switching from unaligned silhouette motion (not an anatomy metric).
+    compensated = {'before':[], 'after':[]}
+    rows, cols = np.meshgrid(np.arange(155), np.arange(512), indexing='ij')
+    for a,b in pairs:
+        flow = optical_flow_tvl1(rgb2gray(images[a][175:330]).astype(np.float32),
+                                rgb2gray(images[b][175:330]).astype(np.float32),
+                                num_warp=3, num_iter=5)
+        for name,masks in [('before',before),('after',after)]:
+            warped = map_coordinates(masks[b][175:330].astype(float),
+                                      [rows+flow[0],cols+flow[1]], order=1, mode='nearest')>0.5
+            compensated[name].append(int((masks[a][175:330]^warped).sum()))
+    report['flow_compensated_switch']={k:{'all':summary(v), 'original49':summary(v[:48]),'per_pair':v}
+                                      for k,v in compensated.items()}
+    # Raw interior stays paired with alpha output; encoding error is reported separately.
+    with av.open(str(TASK/'reading-alpha.webm')) as src:
+        decoder=av.CodecContext.create('libvpx-vp9','r')
+        decoded=[f.to_ndarray(format='rgba') for p in src.demux(video=0) for f in decoder.decode(p)]
+    report['alpha_rgb_interior_mae']=summary([
+        float(np.abs(out[:,:,:3].astype(float)-im).mean(axis=2)[m>250].mean())
+        for out,im,m in zip(decoded,rgb,mattes['after'],strict=True)])
+    (TASK/'metrics.json').write_text(json.dumps(report,indent=2))
+    print(json.dumps({k:v for k,v in report.items() if k not in ['before','after','head_mae_all_pairs','flow_compensated_switch']},indent=2))
+    print(json.dumps({k:{x:y for x,y in v.items() if not isinstance(y,list)} for k,v in report.items() if k in ['before','after']},indent=2))
+    ids=[46,47,48,49,50,51,94,95,96,97,0,1]
+    panel([Image.fromarray(images[i]) for i in ids], [f'frame {i}' for i in ids],TASK/'join-frames.png')
+    panel([Image.fromarray(images[i][50:180,230:340]) for i in ids], [f'head {i}' for i in ids],TASK/'join-heads.png',size=(220,260))
+    ids=[0,8,16,24,32,40,47,48,49,56,64,72,80,88,96,97]
+    crops=[]
+    labels=[]
+    for i in ids:
+        for name,masks in [('before',mattes['before']),('after',mattes['after'])]:
+            rgba=np.dstack((rgb[i],masks[i]))
+            bg=Image.new('RGBA',(552,552),'#557788')
+            bg.alpha_composite(Image.fromarray(rgba))
+            crops.append(bg.convert('RGB').crop((90,189,430,356)))
+            labels.append(f'{name} {i}')
+    panel(crops,labels,TASK/'hand-before-after.png',size=(340,167),columns=4)
+    panel([Image.fromarray(mattes['after'][i]).convert('RGB').crop((90,189,430,356)) for i in ids],
+          [f'alpha {i}' for i in ids],TASK/'hand-mattes.png',size=(340,167),columns=4)
+    panel([Image.fromarray(images[i]) for i in range(98)], [str(i) for i in range(98)],
+          TASK/'all-frames.png',size=(170,170),columns=14)
+
+
+if __name__=='__main__':
+    main()
diff --git a/samples/bedroom/tools/stabilize_loop.py b/samples/bedroom/tools/stabilize_loop.py
new file mode 100644
index 0000000..95b4fb6
--- /dev/null
+++ b/samples/bedroom/tools/stabilize_loop.py
@@ -0,0 +1,146 @@
+"""Assemble the generated forward/return clips and stabilize only the hand/book matte.
+
+Run with the existing ComfyUI environment; no models or dependencies are fetched.
+Optical flow aligns neighbouring masks; only alpha changes, never source RGB.
+"""
+import json
+from concurrent.futures import ThreadPoolExecutor
+from pathlib import Path
+
+import av
+import numpy as np
+import torch
+from extract_layers import load_sam, segment
+from PIL import Image
+from scipy.ndimage import distance_transform_edt, gaussian_filter, label, map_coordinates
+from skimage.color import rgb2gray
+from skimage.registration import optical_flow_tvl1
+
+ROOT = Path('/media/lucian/Downloads/ComfyUI')
+TASK = ROOT / 'output/hel712-task'
+BASE = ROOT / 'output/hel711-task'
+Y0, Y1 = round(175 * 552 / 512), round(330 * 552 / 512)
+
+
+def decode_alpha(path):
+    with av.open(str(path)) as source:
+        decoder = av.CodecContext.create('libvpx-vp9', 'r')
+        return [f.to_ndarray(format='rgba') for p in source.demux(video=0)
+                for f in decoder.decode(p)]
+
+
+def encode(path, frames, alpha):
+    with av.open(str(path), 'w') as output:
+        stream = output.add_stream('libvpx-vp9', rate=16)
+        stream.width = stream.height = frames[0].shape[0]
+        stream.pix_fmt = 'yuva420p' if alpha else 'yuv420p'
+        stream.options = {'crf': '10', 'b': '0', 'auto-alt-ref': '0'}
+        for frame in frames:
+            for packet in stream.encode(av.VideoFrame.from_ndarray(
+                    frame, format='rgba' if alpha else 'rgb24')):
+                output.mux(packet)
+        for packet in stream.encode():
+            output.mux(packet)
+
+
+def signed(mask):
+    binary = mask > 127
+    return distance_transform_edt(binary) - distance_transform_edt(~binary)
+
+
+def stabilize(images, masks):
+    # Padding supplies flow context, but edits are restricted to the specified band.
+    top, bottom = Y0 - 24, Y1 + 24
+    gray = [rgb2gray(im[top:bottom]).astype(np.float32) for im in images]
+    distances = [signed(m[top:bottom]) for m in masks]
+    rows, cols = np.meshgrid(np.arange(bottom-top), np.arange(552), indexing='ij')
+    def one(i):
+        mask = masks[i]
+        aligned = [distances[i]]
+        for offset in [-2, -1, 1, 2]:
+            j = (i + offset) % len(masks)
+            flow = optical_flow_tvl1(gray[i], gray[j], attachment=15,
+                                     num_warp=5, num_iter=10)
+            aligned.append(map_coordinates(distances[j], [rows+flow[0], cols+flow[1]],
+                                           order=1, mode='nearest'))
+        # Trim the most extreme masks; averaging the remaining three signed
+        # distances also avoids a majority-vote jump at the two clip joins.
+        consensus = np.sort(aligned, axis=0)[1:-1].mean(axis=0)
+        # A narrow spatial regularization removes single-pixel segmentation teeth.
+        stable = gaussian_filter(consensus, 0.65)
+        current = distances[i]
+        stable = np.where(np.abs(current) <= 6, stable, current)
+        alpha = np.clip(127.5 + stable * 127.5, 0, 255)
+        # Blend the first/last 8 rows back to the unchanged matte.
+        weight = np.ones(Y1-Y0)
+        weight[:8] = np.linspace(0, 1, 8)
+        weight[-8:] = np.linspace(1, 0, 8)
+        new = mask.copy()
+        roi = alpha[Y0-top:Y1-top]
+        new[Y0:Y1] = np.rint(roi*weight[:, None] + mask[Y0:Y1]*(1-weight[:, None])).astype(np.uint8)
+        return new, int(np.count_nonzero((new>127) != (mask>127)))
+
+    output, changes = [], []
+    with ThreadPoolExecutor(max_workers=4) as executor:
+        for i, (mask, change) in enumerate(executor.map(one, range(len(masks)))):
+            output.append(mask)
+            changes.append(change)
+            if i % 8 == 0:
+                print(f'Flow-aligned matte {i}/{len(masks)}', flush=True)
+    return output, changes
+
+
+def main():
+    torch.set_num_threads(8)
+    cache = TASK / 'segmentation-v2.npz'
+    if cache.exists():
+        data = np.load(cache)
+        images, masks = list(data['images']), list(data['masks'])
+    else:
+        # Preserve original matte outside the hand/book band without rerunning it.
+        original = decode_alpha(BASE / 'reading-alpha.webm')
+        with av.open(str(BASE / 'reading_00001_.webm')) as source:
+            images = [np.array(f.to_image().resize((552, 552), Image.Resampling.LANCZOS))
+                      for f in source.decode(video=0)]
+        masks = [f[:, :, 3] for f in original]
+        model = load_sam(ROOT / 'custom_nodes/was-node-suite-comfyui/repos/SAM/segment_anything',
+                         ROOT / 'models/sams/sam_vit_b_01ec64.pth').to('cuda')
+        with av.open(str(TASK / 'return_00001_.webm')) as source:
+            for i, frame in enumerate(source.decode(video=0)):
+                image = frame.to_image().resize((552, 552), Image.Resampling.LANCZOS)
+                images.append(np.array(image))
+                alpha = np.array(segment(model, image, extra_positive=(
+                    (245, 258), (280, 275), (360, 245), (365, 295))))
+                components, count = label(alpha > 127)
+                sizes = np.bincount(components.ravel())
+                sizes[0] = 0
+                keep = components == sizes.argmax()
+                # Retain feather next to the connected subject; discard isolated sofa specks.
+                from scipy.ndimage import binary_dilation
+                alpha[~binary_dilation(keep, iterations=3)] = 0
+                masks.append(alpha)
+                if i % 8 == 0:
+                    print(f'Segmented return frame {i}', flush=True)
+        np.savez_compressed(cache, images=np.array(images), masks=np.array(masks))
+        del model
+        torch.cuda.empty_cache()
+    stable, changes = stabilize(images, masks)
+    np.savez_compressed(TASK / 'mattes.npz', before=np.array(masks), after=np.array(stable))
+    encode(TASK / 'loop-source.webm', images, False)
+    frames = [np.dstack((rgb, a)) for rgb, a in zip(images, stable, strict=True)]
+    encode(TASK / 'reading-alpha.webm', frames, True)
+    (TASK / 'stabilization.json').write_text(json.dumps({
+        'frames': len(images), 'fps': 16, 'join_pairs': [[48,49],[97,0]],
+        'source_map': [{'frames':[0,48], 'source':'reading_00001_.webm'},
+                       {'frames':[49,97], 'source':'return_00001_.webm'}],
+        'band_512': [175,330], 'band_552': [Y0,Y1],
+        'flow': 'TV-L1, four neighbours, cyclic trimmed signed-distance mean, 6px uncertainty band',
+        'changed_binary_pixels_per_frame': changes,
+        'rgb': 'Original RGB retained; no temporal RGB blending or frame replacement',
+        'outside_band_unchanged': all(np.array_equal(a[:Y0],b[:Y0]) and np.array_equal(a[Y1:],b[Y1:])
+                                      for a,b in zip(masks,stable,strict=True))}, indent=2))
+    print('Encoded 98-frame forward/return candidate, not yet accepted.', flush=True)
+
+
+if __name__ == '__main__':
+    main()
diff --git a/samples/bedroom/tsconfig.json b/samples/bedroom/tsconfig.json
new file mode 100644
index 0000000..6fd0535
--- /dev/null
+++ b/samples/bedroom/tsconfig.json
@@ -0,0 +1,20 @@
+{
+  "compilerOptions": {
+    "target": "ES2022",
+    "module": "ESNext",
+    "moduleResolution": "Bundler",
+    "lib": [
+      "ES2022",
+      "DOM",
+      "DOM.Iterable"
+    ],
+    "strict": true,
+    "noEmit": true,
+    "skipLibCheck": true,
+    "noUnusedLocals": true,
+    "noUnusedParameters": true
+  },
+  "include": [
+    "src"
+  ]
+}