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。

scripts/check-skill-docs.mjs

@@ -0,0 +1,188 @@
+#!/usr/bin/env node
+import fs from "node:fs";
+
+const checks = [];
+
+function fileText(file) {
+  return fs.readFileSync(file, "utf8");
+}
+
+function mustInclude(file, needle, label) {
+  checks.push(() => {
+    const ok = fileText(file).includes(needle);
+    return {
+      ok,
+      label,
+      detail: ok ? `${file} includes "${needle}"` : `${file} must include "${needle}"`,
+    };
+  });
+}
+
+function mustNotMatch(file, pattern, label) {
+  checks.push(() => {
+    const ok = !pattern.test(fileText(file));
+    return {
+      ok,
+      label,
+      detail: ok ? `${file} does not match ${pattern}` : `${file} must not match ${pattern}`,
+    };
+  });
+}
+
+mustInclude(
+  "SKILL.md",
+  "Generated work must live in a task folder, not in the skill root.",
+  "root output guardrail in SKILL.md",
+);
+mustInclude(
+  "SKILL.md",
+  "local-tests/<slug>/",
+  "default task folder in SKILL.md",
+);
+mustInclude(
+  "SKILL.md",
+  "Triple Live Photo",
+  "triple Live Photo capability in SKILL.md",
+);
+mustInclude(
+  "SKILL.md",
+  "material-first Live Photo puzzle layouts",
+  "material-first puzzle capability in SKILL.md",
+);
+mustInclude(
+  "SKILL.md",
+  "use the M16 Image-Led Cover / text-on-image rules",
+  "single-video text uses M16 overlay rules",
+);
+mustInclude(
+  "SKILL.md",
+  "Do not invent extra kicker, meta, hairlines",
+  "single-video text must not invent extra overlay copy",
+);
+mustInclude(
+  "SKILL.md",
+  "platform limits (`5s` Xiaohongshu, `3s` WeChat Official Account)",
+  "platform publishing reminder in SKILL.md",
+);
+mustInclude(
+  "SKILL.md",
+  "Audience-facing copy must describe the user's actual scene",
+  "audience-facing copy guardrail in SKILL.md",
+);
+mustInclude(
+  "SKILL.md",
+  "Do not add non-template ornaments just to satisfy an automated density warning",
+  "non-template ornament guardrail in SKILL.md",
+);
+mustNotMatch(
+  "SKILL.md",
+  /Create a task folder in the current workspace/,
+  "no root-level task-folder instruction in SKILL.md",
+);
+
+mustInclude(
+  "references/production-workflow.md",
+  "Create a task folder under `local-tests/` by default",
+  "production workflow uses local-tests",
+);
+mustInclude(
+  "references/production-workflow.md",
+  "Do not create generated task folders or rendered assets in the skill root",
+  "production workflow forbids skill-root outputs",
+);
+
+mustInclude(
+  "references/live-photo-production.md",
+  "## Live Photo Information Budget",
+  "Live Photo information budget section",
+);
+mustInclude(
+  "references/live-photo-production.md",
+  "## Triple Live Photo Collage",
+  "triple collage section",
+);
+mustInclude(
+  "references/live-photo-production.md",
+  "## Material-First Puzzle Layouts",
+  "material-first puzzle section",
+);
+mustInclude(
+  "references/live-photo-production.md",
+  "Do not render single-video text as generic subtitles.",
+  "single-video text is not subtitle-style",
+);
+mustInclude(
+  "references/live-photo-production.md",
+  "Do not invent extra kicker, meta, hairlines",
+  "single-video overlay must not invent extra copy",
+);
+mustInclude(
+  "references/live-photo-production.md",
+  "Four-grid",
+  "four-grid puzzle guidance",
+);
+mustInclude(
+  "references/live-photo-production.md",
+  "## Long Video Intake",
+  "long video intake section",
+);
+mustInclude(
+  "references/live-photo-production.md",
+  "Web-sourced free videos are only for making our own demo/promo cases",
+  "user-supplied video is the normal path",
+);
+mustInclude(
+  "references/live-photo-production.md",
+  "Audience-facing copy should name the real scene in the video.",
+  "Live Photo visible-copy guardrail",
+);
+
+mustInclude(
+  "references/category-cookbook.md",
+  "## Live Photo Scene Library",
+  "category scene library section",
+);
+mustInclude(
+  "references/category-cookbook.md",
+  "This is not a fixed template list.",
+  "category library stays heuristic",
+);
+
+mustInclude(
+  "PRODUCT.md",
+  "## 10. Live Photo 复盘（2026-07-01）",
+  "product doc records Live Photo retrospective",
+);
+mustInclude(
+  "PRODUCT.md",
+  "把内部制作要求写成观众可见文案",
+  "product doc records visible-copy failure mode",
+);
+mustInclude(
+  "HANDOFF.md",
+  "### v0.15 · 2026-07-01",
+  "handoff records Live Photo version history",
+);
+mustInclude(
+  "HANDOFF.md",
+  "不要把制作要求当成观众可见内容",
+  "handoff records Live Photo execution pitfall",
+);
+
+let failed = 0;
+for (const run of checks) {
+  const result = run();
+  const marker = result.ok ? "PASS" : "FAIL";
+  console.log(`${marker} ${result.label}`);
+  if (!result.ok) {
+    failed += 1;
+    console.log(`  ${result.detail}`);
+  }
+}
+
+if (failed > 0) {
+  console.error(`\n${failed} skill doc check(s) failed.`);
+  process.exit(1);
+}
+
+console.log(`\n${checks.length} skill doc checks passed.`);