④段整套同步（六节 ＋ P/S/F/J ＋ 模板）＋ open-design 移到技能根

一、④段整套同步（用户选候选 A）
- 新增 `references/stage-proto-doc/assets/产品文档模板.html`（16 KB／247 行，从备份拷、转 LF）。
- ④段 SKILL.md 换成备份 15:28 那版，并按模板口径改齐：
  · 「产品文档框架」从「四块＋一附录」改成**六节** —— 页面结构／功能清单／使用场景／操作流程／
    跨页与界面状态／待确认与偏离；与模板同构，⛔ 不从空白页重写结构。
  · 编号从 R/S/F 改成 **P 页面／S 场景／F 功能／J 二级功能**，各自唯一、按展示顺序通排。
  · 保留旧版有价值的要求：每项功能补齐 做什么／入口在哪／输入边界／异常与恢复；重点功能三处标红；
    横向流程图每步写清页面／功能／操作／完成判据。
  · 完成标准「七节」→「六节」，自查清单同步换掉「需求」那批条目，补模板与配图两条。
  · 路径 `designs/<项目>/` → `docs/pm/<项目>/ui/`（2 处）。
  · 补回本机那条「每份产出文档开头都要有一张图」的引用（指向主 skill，段内不复述）。
- 主 skill 同步：四段结构表④行、④段沿革、画图小节（④段画页面结构图 ＋ 用户路径）。

二、open-design 移到技能根（用户选候选 A）
- `git mv product-planning/references/stage-delivery/assets/open-design → open-design/`（4178 文件）。
- `.gitignore` 白名单加 `!/open-design/` —— 否则移出去就不再纳入版本控制。
- 引用改 11 处：路径形态 `assets/open-design/...` → `<技能根>/open-design/...`；
  「随段携带的自带件」改称「同根技能」；「路径怎么找」那条改成自带件（段内相对路径）与
  同根技能（`<技能根>/<技能名>/`）两类分开写。
- open-design 自己的 ATTRIBUTION.md 两处同步（它现在与 oil-ui-pro 同层）。
- 副作用（有益）：命名闸门读数由 2063 降到 225 —— 此前它把 open-design 里 919 个第三方 md
  当成规则一起扫了；现在只扫本包 23 个 md。已确认④段的 H1 与 4a/4b/4c 子步仍在检查范围内。

三、验收
- check_naming.py --ws E:/ProgramData/AIProject/contentm_agent ＝ 通过 225 / 失败 0 / 提示 27。
- 活文件里 `assets/open-design` 残留 0；工作区 CRLF 文件 0。

open-design/design-systems/_schema/defaults.css

@@ -0,0 +1,100 @@
+/* ─────────────────────────────────────────────────────────────────────────
+ * design-systems/_schema/defaults.css
+ *
+ * Fallback values for every Layer A2 token in the shared schema.
+ *
+ * What this file is FOR:
+ *   - A human-readable mirror of the `fallback` field on every A2
+ *     entry in `tokens.schema.ts`. Reviewers can scan real CSS and
+ *     spot weird defaults faster than they can read a TS array.
+ *   - The future input to the derive script (PR-B): when a brand's
+ *     DESIGN.md does not specify an A2 token, the script copies the
+ *     declaration from this file into the brand's tokens.css.
+ *
+ * What this file is NOT FOR:
+ *   - Runtime cascade. Artifacts are generated by agents pasting one
+ *     brand's :root block into a single <style>. There is no global
+ *     stylesheet that loads alongside the brand. A brand's tokens.css
+ *     must therefore declare every A2 token directly — this file
+ *     never reaches the browser.
+ *
+ * Drift contract:
+ *   The `design-system: A2 defaults parity` guard check asserts that
+ *   each declaration here matches the `fallback` field on the
+ *   corresponding entry in `tokens.schema.ts`. Update both together.
+ *
+ * Tokens absent from this file:
+ *   - A1-identity tokens (--bg, --fg, --accent, font stacks) have no
+ *     defensible cross-brand default; brands must author them.
+ *   - A1-structure tokens (type scale, container, section-y) are
+ *     structural decisions that vary per brand by design.
+ *   - B-slot tokens (--fg-2, --meta, --surface-warm, --border-soft)
+ *     resolve via `var()` aliasing inside each brand's tokens.css,
+ *     not via this file.
+ *   - C-extension tokens are brand-specific and have no shared
+ *     default by definition.
+ * ─────────────────────────────────────────────────────────────────── */
+
+:root {
+  /* Accent states (over --accent bg). The black-mix formulas work for
+     mid-luminance accents; brands with very dark or very light accents
+     should override the value with a hand-picked one (e.g. kami binds
+     --accent-hover to var(--accent) because ink-blue cannot darken
+     further visibly). */
+  --accent-on:     #ffffff;
+  --accent-hover:  color-mix(in oklab, var(--accent), black 8%);
+  --accent-active: color-mix(in oklab, var(--accent), black 14%);
+
+  /* Semantic state. Reserve under 5% of any surface area; not all
+     brands need these — print-first kami inherits defaults rather than
+     designing custom warm equivalents. */
+  --success: #16a34a;
+  --warn:    #eab308;
+  --danger:  #dc2626;
+
+  /* Monospace. Every brand uses kbd / tabular-nums / code somewhere;
+     CJK brands override with a stack that includes their preferred
+     CJK monospace face (kami adds TsangerJinKai02 / Source Han Serif). */
+  --font-mono: ui-monospace, "SF Mono", "JetBrains Mono", Menlo, Monaco, Consolas, monospace;
+
+  /* Base spacing scale on a 4px grid. Identical across default and
+     kami today. Brands with a print-rooted rhythm (different physical
+     paper sizes) may rebind these wholesale; keep the names stable. */
+  --space-1:  4px;
+  --space-2:  8px;
+  --space-3:  12px;
+  --space-4:  16px;
+  --space-5:  20px;
+  --space-6:  24px;
+  --space-8:  32px;
+  --space-12: 48px;
+
+  /* Radius scale. Pill is functionally fixed at 9999px; the small /
+     medium / large tiers are defaults that brands routinely override
+     to express softness or sharpness as part of brand mood. */
+  --radius-sm:   8px;
+  --radius-md:   12px;
+  --radius-lg:   16px;
+  --radius-pill: 9999px;
+
+  /* Elevation. Three sanctioned levels (no fourth — that is
+     neumorphism territory). Brands forbidding blur shadows (kami,
+     paper, editorial) override --elev-raised with a whisper or
+     ring-only treatment. */
+  --elev-flat:   none;
+  --elev-ring:   0 0 0 1px var(--border);
+  --elev-raised: 0 2px 8px color-mix(in oklab, var(--fg), transparent 92%);
+
+  /* Focus. Implemented as a box-shadow so it layers outside the
+     element without affecting layout. Brands forbidding cool-blue
+     glows must override; rebind via accent or a hand-picked ring. */
+  --focus-ring: 0 0 0 3px color-mix(in oklab, var(--accent), transparent 70%);
+
+  /* Motion. Two durations + one easing curve, per the anti-ai-slop
+     "short, purposeful transitions (150–250ms) with stable easing"
+     contract. Add a third duration only when a real interaction
+     needs it; do not invent --motion-slow speculatively. */
+  --motion-fast:   150ms;
+  --motion-base:   200ms;
+  --ease-standard: cubic-bezier(0.2, 0, 0, 1);
+}