W15: workflow improvements — EXPRESS fast-path, audit→fix closed loop, metadata self-check (W15.1-W15.3)

- W15.1 (杨帆): Add EXPRESS fast-path to §11 state machine (T17/T18, E1-E6 conditions, escalation safety valve)
- W15.2 (王测): Add §14 audit→fix closed loop — findings-registry.md, severity-driven auto-triage, CRITICAL blocking rule
- W15.3 (胡桐): Create scripts/check_agents_metadata.py (5-check: YAML parse, rating range, group/member refs, duplicate IDs)
- Fix YAML orphan bugs in 3 profiles: devops-hu, engineer-sun, security-cao (perf_log entries outside array)
- Pre-fill findings-registry.md with 10 historical findings from W11.1/W11.7 audits

Co-Authored-By: Claude Opus 4.7 <noreply@anthropic.com>

agents/engineer-sun/profile.md

@@ -29,7 +29,6 @@ performance_log:
       修复前：第一行非 Content-Length 时 continue 丢弃该行，导致 header 解析偏移错位。
       修复后：正确遍历所有 header 行，空行后若仍未找到 Content-Length 则记录错误并跳过帧。
       编译通过，smoke test 通过。
-current_groups: []
   - date: 2026-05-27
     event: "W13.2: 深度审计 deepseek_plugin.cpp (486 行) — SSE 解析/ABI 异常安全/堆纪律/重复度"
     rating: completed
@@ -57,4 +56,5 @@ current_groups: []
       构建验证: cmake --build Release 0 error; ctest 4/4 pass。
       L420-471 reader_loop, L481-559 start, L561-603 stop 三件套, L605-630 open, L632-655 close,
       L657-683 diagnostics, L685-730 hover, L730-780 completion, L807-821 on_shutdown.
+current_groups: []
 ---