Record the diagnostics conclusions and pause unit dispatch

Why: the svc flake is machine-load-dependent (load 66 during failures,
idle-machine runs pass 553/553) and the .gitmodules rewrite did not
reproduce under controlled materialize tests; agent-unit dispatch is
not viable at current load.
Evidence: two idle full-suite runs 553/553 green; controlled
materialize test with unchanged .gitmodules md5.
Impact: task metadata only.
Refs: feature/recall-misexec-fixes (environment findings)
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2026-10-23 15:45:30 +00:00
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**非目标**:组件仓行为变更;A4;部署;svc settle 等待事件驱动化重构(另行评估)。
## 诊断结论(2026-10-22 晚,host)
1. **svc flake = 机器负载依赖**:失败时段机器 load average 66(27 用户共享机,并行会话重负载 + 残留 agent CLI);空闲后全量 governance 两次 553 测试全过(含 svc 23/23)。非脚本缺陷;修复候选:svc settle 等待改轮询+deadline(负载鲁棒性增强),或在低负载窗口跑治理套件。
2. **.gitmodules 改写机制未复现**:实测 materialize/`submodule update --init --jobs 8` 均不改写(md5 不变);疑似并行会话共享检出操作所致。已还原 82+ 处;缓解=checkout 扫还原(已验证)。机制需上游排查。
3. **agent 单元派发在负载 66 下不可行**(cursor 配额死、pi 输出截断、时序 flake)——本任务暂停派发,待负载回落。
## Agent 实施收据
路由与 fail-stop 规则见根目录 AGENT-EXECUTION.md 与 policy/delivery.md;每次尝试一行,原始日志留在源码外收据路径。