Add document compliance checklist section to AGENTS.md

P0 (7 mandatory) + P1 (3 suggested) checklist for REFERENCE/*.md files,
with M4_workspace/ exception. AI agents must self-check before creating docs.

AGENTS.md

@@ -673,6 +673,36 @@ docs_v1.0/M4_workspace/YYYY-MM-DD_<topic>_test_report.md (測試報告)
 
 詳細規範見 `docs_v1.0/M4_workspace/M4_NOTIFICATION_PROTOCOL.md`。
 
+## Document Compliance Checklist
+
+Before creating any `REFERENCE/*.md` file, verify all items below.
+
+### P0 — Mandatory (7 items)
+
+| # | Check | Rule |
+|---|-------|------|
+| 1 | YAML frontmatter | `title`, `version`, `date`, `author`, `status` present |
+| 2 | Version history | Table at bottom of file tracking changes |
+| 3 | Top info table | scope, status, applicable to, etc. |
+| 4 | PascalCase filename | e.g. `DetectorRegistry.md`, not `detector_registry.md` |
+| 5 | `_` separator | Within filenames use `_`, never spaces or other chars |
+| 6 | English content | Entire file in English |
+| 7 | REFERENCE/ path | File must reside under `docs_v1.0/REFERENCE/` |
+
+### P1 — Suggested (3 items)
+
+| # | Check | Note |
+|---|-------|------|
+| 1 | Cross-references | Link to related REFERENCE docs |
+| 2 | Glossary terms | Define non-obvious terms inline or link glossary |
+| 3 | Diagrams | Include Mermaid/ASCII diagram for complex topics |
+
+### Exception
+
+`M4_workspace/` files are exempt from this checklist (free-format reply documents).
+
+---
+
 ## Delivery Procedure
 
 完整交付程序（M4_workspace → M5 → Release → Deploy → Public）見：