Add AGENTS.md + tighten contribution flow

- AGENTS.md: public contributor/agent guide (two-file rule, model-centric
  ids, one-entry-per-harness, bilingual notes, screenshot proof)
- PR template: require a generation proof screenshot; drop the manual
  update-registry step; add id-naming and no-README-edit checks
- CI: PRs only run validate-data; pushes to main auto-regenerate and commit
  the README registry (contents:write on that job, [skip ci], no loop)
- README/update-registry: reflect auto-synced registry; fix stale 'two cases'
  -> three (mythos-craft, pelican-cycling, skeleton-watch); link AGENTS.md

Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>

.github/PULL_REQUEST_TEMPLATE.md

@@ -1,19 +1,33 @@
-<!-- 感谢贡献！只需两类文件：outputs/<model-id>/<case-id>.<ext> + models/<model-id>.json -->
-<!-- Thanks for contributing! Only two kinds of files: the artifact + the JSON registration. -->
+<!-- 感谢贡献！只需两类文件：outputs/<artifactDir>/<case-id>.<ext> + models/<model-id>.json -->
+<!-- Thanks for contributing! Only two kinds of files: the artifact + the JSON registration. 详见 AGENTS.md -->
 
 ## 产出说明 / Run info
 
 - 模型 / Model:
-- 运行环境 / Harness（如 ChatGPT Web、Claude Code、Google AI Studio、本地 CLI…）:
-- 思考配额 / Thinking effort（如 Max、High、Extended Pro、Thinking…）:
-- 是否一次生成 / One-shot? （是/否；若有修复请在 note 里说明 / if fixed, document it in the note）
+- 厂商 / Vendor:
+- 运行环境 / Harness（如 ChatGPT Web、Claude Code、Codex CLI、AntiGravity…，这是工具不是模型）:
+- 思考配额 / Thinking effort（如 Max、High、xhigh、Extended Pro、Thinking…）:
+- 是否一次生成 / One-shot?（是/否；若有修复请在 note 里说明 / if fixed, document it in the note）
+
+## 生成凭证截图 / Proof screenshot **(required)**
+
+<!-- 直接把图片拖进下面，GitHub 会托管它。不要把图片文件提交进仓库。 -->
+<!-- Drag the image in below; GitHub hosts it. Do NOT commit image files into the repo. -->
+
+请贴一张**生成过程截图**：你的 harness / IDE 中能看到**模型名 + 思考配额**正在产出本产物，
+作为「确实用了这套 harness + 模型 + effort」的凭证。
+Please attach a screenshot of the generation showing the **model name + effort** in your harness/IDE.
 
 ## 自查 / Checklist
 
-- [ ] `models/<model-id>.json` 中 `harness` 与 `effort` 已如实填写（站点据此生成 metadata 与品牌 icon）
-- [ ] 每条 run 的 `note` 双语（zh + en）填写了上面的来历信息 / bilingual `note` documents the provenance above
+- [ ] 只改了两类文件：`outputs/<artifactDir>/<case-id>.<ext>` + `models/<model-id>.json` / only the artifact + its JSON
+- [ ] **没有**手改 `README.md` / `README.en.md`（注册表合并后由 CI 自动同步）/ did **not** hand-edit the README registry (auto-synced after merge)
+- [ ] 模型 id 用短横线、以**模型**命名（非 harness），如 `deepseek-v4-flash-reasonix` / dash-case id named after the model, not the harness
+- [ ] `harness` 与 `effort` 如实填写（站点据此生成 metadata 与品牌 icon）/ `harness` and `effort` are accurate
+- [ ] 每条 run 的 `note` 双语（zh + en，zh 先，无 emoji）填了来历 / bilingual `note`, zh first, no emojis
+- [ ] 同一模型换 Harness 或思考配额是**新建一个 JSON 条目** / a different harness or effort = a NEW json entry
 - [ ] `contributor` 是我的 GitHub 用户名 / `contributor` is my GitHub username
-- [ ] 同一模型在不同 Harness 或思考配额下是**新建一个 JSON 条目**，不是塞进现有条目 / a different harness or effort = a NEW json entry, not a variant
-- [ ] 已运行 `bun scripts/update-registry.ts` 更新 README Registry 表 / ran `bun scripts/update-registry.ts` to refresh the README Registry tables
+- [ ] 已贴生成凭证截图 / attached the proof screenshot above
+- [ ] 本地 `bun scripts/validate-data.ts` 通过 / `bun scripts/validate-data.ts` passes locally
 
-<!-- CI 会跑数据校验 + 构建；规则详见 README「贡献一个模型产出」。 -->
+<!-- 规则详见 AGENTS.md。CI 只跑数据校验；README Registry 在合并到 main 后由 CI 自动重生成。 -->

.github/workflows/ci.yml

@@ -14,11 +14,35 @@ jobs:
     steps:
       - uses: actions/checkout@v4
       - uses: oven-sh/setup-bun@v2
-      - name: Check README registry
-        run: bun scripts/update-registry.ts --check
       - name: Validate contribution data
         run: bun scripts/validate-data.ts
 
+  sync-registry:
+    # The README Registry tables are generated from models/*.json. Contributors
+    # do not edit them by hand; on every push to main we regenerate and commit
+    # any drift back. Commits pushed with GITHUB_TOKEN do not retrigger
+    # workflows, and the message carries [skip ci] too, so there is no loop.
+    if: github.event_name == 'push'
+    needs: validate
+    runs-on: ubuntu-latest
+    permissions:
+      contents: write
+    steps:
+      - uses: actions/checkout@v4
+      - uses: oven-sh/setup-bun@v2
+      - name: Regenerate README registry
+        run: bun scripts/update-registry.ts
+      - name: Commit if registry drifted
+        run: |
+          if git diff --quiet -- README.md README.en.md; then
+            echo "Registry already in sync."
+            exit 0
+          fi
+          git config user.name "github-actions[bot]"
+          git config user.email "41898282+github-actions[bot]@users.noreply.github.com"
+          git commit -am "chore: sync README registry [skip ci]"
+          git push origin HEAD:main
+
   trigger-site-rebuild:
     # The site lives in the private nagi-bench-site repo (Cloudflare Pages).
     # With SITE_DISPATCH_TOKEN set the rebuild is instant; without it the