W16: close CRITICAL/HIGH findings, integrate metadata gate, complete audit summaries (W16.1-W16.6)

- W16.1 (曹武): F-11.7-1 CLOSED — confirmed W12.4 fix, corrupt binary eliminated
- W16.2 (孙宇): F-11.1-1 FIXED — context_plugin.cpp try/catch on set_max_tokens + on_shutdown
- W16.3 (陈风): F-11.1-2 CLOSED — confirmed W12.1 fix, strdup OOM protection already in place
- W16.4 (胡桐): Integrate check_agents_metadata into refresh_status.py as pre-gate (error→exit 1)
- W16.5 (周岩): Add Findings Summary to W13.3 network audit, register 3 findings
- W16.6 (赵码): Add Findings Summary to W13.1+W13.2 AI audits, register 8 findings (4 already W14-fixed)

Build 0 error, ctest 4/4 pass, metadata check 0 error 0 warning.

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

agents/engineer-zhao/profile.md

@@ -43,5 +43,5 @@ current_groups:
     event: "W11.4: 实现管道输入支持(grp-cli-ux B3)，pipe_mode检测_isatty→读取全部stdin→单次chat→退出；空输入返回1提示empty prompt；0 error 0 warning编译通过；4/4测试100% pass"
     rating: A
   - date: 2026-05-27
-    event: "W12.3: 修复3个命令解析bug(BUG-2 /clear空session谎报成功→stderr守卫; BUG-3 /context空session静默→else分支stderr; BUG-4 /file write裸命令→统一token解析入口)，build 0 error 0 warning，4/4 test pass"
-    rating: completed
+    event: "W16.6: 为 W13.1/W13.2 审计报告补充 Findings Summary 小节（W13.1: 11 条发现含 3H/1M/7L，W13.2: 4 条发现含 1H/3M）；8 条 MEDIUM+ 录入 registry（4 条标注 Fix Wave W14）；4 条已被 W14 修复（ABI try/catch）"
+    rating: A