v0.15: Live Photo 生产规则 — 平台限制、拼图版式、长视频处理、发布提醒、可见文案规则

新增 Live Photo 正式能力：单视频、二宫格、三宫格、四宫格、三连拼图、
长视频低成本诊断。增加 references/live-photo-production.md 生产规范、
scripts/ 工具链（contact sheet / .pvt 打包 / Apple metadata）、
validator R8 visual bounds + R9 title gap、文档约束测试。

由 Codex 完成主体实现。

references/production-workflow.md

@@ -2,10 +2,10 @@
 
 ## Recommended Folder Shape
 
-Create a task folder under the current workspace:
+Create a task folder under `local-tests/` by default:
 
 ```text
-social-card-<slug>/
+local-tests/<slug>/
   index.html
   render.cjs
   assets/
@@ -14,9 +14,11 @@ social-card-<slug>/
 
 Use descriptive slugs:
 
-- `social-card-doubao-input`
-- `social-card-hiking-outfit`
-- `wechat-ai-card-skill-cover`
+- `local-tests/social-card-doubao-input`
+- `local-tests/social-card-hiking-outfit`
+- `local-tests/wechat-ai-card-skill-cover`
+
+If the user explicitly names another output folder, use that folder instead. Do not create generated task folders or rendered assets in the skill root next to `SKILL.md`. Root-level folders such as `social-card-*`, `livephoto-*`, `wechat-*`, `output/`, and loose `.png` / `.jpg` / `.mov` / `.pvt` artifacts are not allowed for new work.
 
 ## HTML/CSS Rendering Pattern