diff --git a/.task/feature-u7-ops-drills.md b/.task/feature-u7-ops-drills.md
index 8ffea77a..3bade91a 100644
--- a/.task/feature-u7-ops-drills.md
+++ b/.task/feature-u7-ops-drills.md
@@ -10,7 +10,7 @@
 - 授权与交付终点：B6 pgbench 基线、C4 PG/Redis 断连演练、C5 物理备份+WAL/PITR 与 pg_dump 恢复演练；隔离栈实跑、运维手册、检查单与 Documents 报告/方案 r2.2；Dev 与 Documents 两个 PR 合入并归档任务卡。不含重放、C3 双主机、产品代码、CI 工作流，以及第二实例写流量放行。
 - 交付模式：authorized-continuous
 - 自动推进授权：有；授权范围：本增量（B6/C4/C5 入口、隔离演练、手册、检查单、Documents 报告与方案 r2.2、组合测试、PR、合入核验与任务卡归档）；授权来源：用户 2026-10-12「不要做重放了，继续推进」并指示按已附计划实施；授权终点：Documents 与 Dev PR 合入、任务卡归档；停止条件：演练暴露产品缺陷则该轨记 FAIL 并停（不改产品代码）；任一步可能触及非演练服务、端口或主检出则立即中止；计时类演练开始前磁盘余量低于 100GB 或 load average 高于 16 则暂停重跑
-- 当前阶段：实施与自检；当前增量：I1（B6 pgbench）
+- 当前阶段：实施与自检；当前增量：I2（C4 断连演练）
 - 基线说明：计划起草时主检出为 ac1de9c；本次 precheck 的权威 main 已前进到 R0 8ebf502146（含 #470 钉住 backend EXT-8b）。backend gitlink 仍为 8e509775d39d1455b69be44803037faa7af844b4，与计划一致。
 - 流程依据：仓库根目录 policy/delivery.md（归档后仍按仓库根目录定位）
 
@@ -247,3 +247,79 @@
   "receipt_sha256": "5b3c8a85614c2a603d5b9d7829ad8f4c03b4443bcc4dacf486be525ccd144a8e"
 }
 ```
+
+<!-- Local receipt: SELF. Digests detect corruption; they do not authenticate a reviewer or CI. -->
+```json
+{
+  "schema": 1,
+  "source": "SELF",
+  "timestamp": "2026-10-12T14:00:17.881586+00:00",
+  "command": "tests/ops/run_fault_drill.sh --fault all",
+  "command_sha256": "4bd83ebd726a9bd887e95cc7e65376a30ea5b1dd2881df827c7c5a44f2472bb6",
+  "cwd": "/home/weichen/projects/Agent-System-Dev-wt-feature-u7-ops-drills",
+  "common_dir": "/home/weichen/projects/Agent-System-Dev/.git",
+  "before": {
+    "head": "4c2e326c03b5fac11ac0704e587bcf73b24ab3f7",
+    "branch": "feature/u7-ops-drills",
+    "target_branch": "main",
+    "target_head": "3b9cf82cd6fb53f973f26e2039275f7858b0c654",
+    "status": " M .task/feature-u7-ops-drills.md\n",
+    "tracked_diff_sha256": "55a5823ab8cf8776e8826becd084474930f0741354b8b86f13f79b52bd8bffe6",
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+  },
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+    "target_branch": "main",
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modules/backend/deps/agent-squad/deps/error-code-system (a3ee67b)\n 26b562d2e34fbc560711296a309c91c74ffc55b1 modules/backend/deps/agent-squad/deps/error-code-system/deps/development-guidelines (26b562d)\n 49b5d8be604d05e4246dffa0d10fa1c2b7ad45d7 modules/backend/deps/agent-squad/deps/logging-system (49b5d8b)\n 26b562d2e34fbc560711296a309c91c74ffc55b1 modules/backend/deps/agent-squad/deps/logging-system/deps/development-guidelines (26b562d)\n ba289e7b1780a29855aef8477bf1ac49bd563eb2 modules/backend/deps/agent-system-core (v0.3.0-10-gba289e7)\n a3ee67bba269e1276c14e22c026171ecf2cf6190 modules/backend/deps/error-code-system (a3ee67b)\n 26b562d2e34fbc560711296a309c91c74ffc55b1 modules/backend/deps/error-code-system/deps/development-guidelines (26b562d)\n 49b5d8be604d05e4246dffa0d10fa1c2b7ad45d7 modules/backend/deps/logging-system (49b5d8b)\n 26b562d2e34fbc560711296a309c91c74ffc55b1 modules/backend/deps/logging-system/deps/development-guidelines (26b562d)\n ba289e7b1780a29855aef8477bf1ac49bd563eb2 modules/core (v0.3.0-10-gba289e7)\n 3cc6438030803b8e2355d2867766e9654203f265 modules/documents (heads/main)\n 1edd872c554f666ba43353da7e6f0605ecec311b modules/frontend (v0.3.0-54-g1edd872)\n 83e80f5648649c3cc070f4dbc6bf118996828ae8 modules/ui (v0.3.0-20-g83e80f5)\n"
+  },
+  "after_error": null,
+  "exit_code": 2,
+  "output": "[fault] results /home/weichen/projects/Agent-System-Dev-wt-feature-u7-ops-drills/tests/ops/results/fault-20261012-140017\n[fault] creating u7drill on 127.0.0.1:18991\n[ops] port 18991 is in use; refusing before create\n",
+  "output_sha256": "e44ac18df00a88b6df32d864da00eeb86354265a93b7e618beb88d25590b42c6",
+  "receipt_sha256": "6066c6fd529ad8314c304b76caa43bc9d921df26094b5e4934491fecbf7f5584"
+}
+```
+
+<!-- Local receipt: SELF. Digests detect corruption; they do not authenticate a reviewer or CI. -->
+```json
+{
+  "schema": 1,
+  "source": "SELF",
+  "timestamp": "2026-10-12T13:37:42.026603+00:00",
+  "command": "tests/ops/run_fault_drill.sh --fault all",
+  "command_sha256": "4bd83ebd726a9bd887e95cc7e65376a30ea5b1dd2881df827c7c5a44f2472bb6",
+  "cwd": "/home/weichen/projects/Agent-System-Dev-wt-feature-u7-ops-drills",
+  "common_dir": "/home/weichen/projects/Agent-System-Dev/.git",
+  "before": {
+    "head": "4c2e326c03b5fac11ac0704e587bcf73b24ab3f7",
+    "branch": "feature/u7-ops-drills",
+    "target_branch": "main",
+    "target_head": "9b5be3926eaa394a9e520fd72ffdf6d0a48d1aef",
+    "status": " M .task/feature-u7-ops-drills.md\n",
+    "tracked_diff_sha256": "55a5823ab8cf8776e8826becd084474930f0741354b8b86f13f79b52bd8bffe6",
+    "untracked": {},
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modules/backend/deps/agent-squad/deps/agent-intent/deps/logging-system/deps/development-guidelines (26b562d)\n c348441691e8bdab784a03aa9be64d53dacff341 modules/backend/deps/agent-squad/deps/agent-native (heads/main)\n 343b1e6d9a5b58e47bf7e594826221036ae8175c modules/backend/deps/agent-squad/deps/agent-native/deps/agent-intent (heads/main)\n 26b562d2e34fbc560711296a309c91c74ffc55b1 modules/backend/deps/agent-squad/deps/agent-native/deps/agent-intent/deps/development-guidelines (26b562d)\n a3ee67bba269e1276c14e22c026171ecf2cf6190 modules/backend/deps/agent-squad/deps/agent-native/deps/agent-intent/deps/error-code-system (a3ee67b)\n 26b562d2e34fbc560711296a309c91c74ffc55b1 modules/backend/deps/agent-squad/deps/agent-native/deps/agent-intent/deps/error-code-system/deps/development-guidelines (26b562d)\n 49b5d8be604d05e4246dffa0d10fa1c2b7ad45d7 modules/backend/deps/agent-squad/deps/agent-native/deps/agent-intent/deps/logging-system (49b5d8b)\n 26b562d2e34fbc560711296a309c91c74ffc55b1 modules/backend/deps/agent-squad/deps/agent-native/deps/agent-intent/deps/logging-system/deps/development-guidelines (26b562d)\n 26b562d2e34fbc560711296a309c91c74ffc55b1 modules/backend/deps/agent-squad/deps/agent-native/deps/development-guidelines (26b562d)\n a3ee67bba269e1276c14e22c026171ecf2cf6190 modules/backend/deps/agent-squad/deps/agent-native/deps/error-code-system (a3ee67b)\n 26b562d2e34fbc560711296a309c91c74ffc55b1 modules/backend/deps/agent-squad/deps/agent-native/deps/error-code-system/deps/development-guidelines (26b562d)\n 49b5d8be604d05e4246dffa0d10fa1c2b7ad45d7 modules/backend/deps/agent-squad/deps/agent-native/deps/logging-system (49b5d8b)\n 26b562d2e34fbc560711296a309c91c74ffc55b1 modules/backend/deps/agent-squad/deps/agent-native/deps/logging-system/deps/development-guidelines (26b562d)\n 26b562d2e34fbc560711296a309c91c74ffc55b1 modules/backend/deps/agent-squad/deps/development-guidelines (26b562d)\n a3ee67bba269e1276c14e22c026171ecf2cf6190 modules/backend/deps/agent-squad/deps/error-code-system (a3ee67b)\n 26b562d2e34fbc560711296a309c91c74ffc55b1 modules/backend/deps/agent-squad/deps/error-code-system/deps/development-guidelines (26b562d)\n 49b5d8be604d05e4246dffa0d10fa1c2b7ad45d7 modules/backend/deps/agent-squad/deps/logging-system (49b5d8b)\n 26b562d2e34fbc560711296a309c91c74ffc55b1 modules/backend/deps/agent-squad/deps/logging-system/deps/development-guidelines (26b562d)\n ba289e7b1780a29855aef8477bf1ac49bd563eb2 modules/backend/deps/agent-system-core (v0.3.0-10-gba289e7)\n a3ee67bba269e1276c14e22c026171ecf2cf6190 modules/backend/deps/error-code-system (a3ee67b)\n 26b562d2e34fbc560711296a309c91c74ffc55b1 modules/backend/deps/error-code-system/deps/development-guidelines (26b562d)\n 49b5d8be604d05e4246dffa0d10fa1c2b7ad45d7 modules/backend/deps/logging-system (49b5d8b)\n 26b562d2e34fbc560711296a309c91c74ffc55b1 modules/backend/deps/logging-system/deps/development-guidelines (26b562d)\n ba289e7b1780a29855aef8477bf1ac49bd563eb2 modules/core (v0.3.0-10-gba289e7)\n 3cc6438030803b8e2355d2867766e9654203f265 modules/documents (heads/main)\n 1edd872c554f666ba43353da7e6f0605ecec311b modules/frontend (v0.3.0-54-g1edd872)\n 83e80f5648649c3cc070f4dbc6bf118996828ae8 modules/ui (v0.3.0-20-g83e80f5)\n"
+  },
+  "after_error": null,
+  "exit_code": 0,
+  "output": "[fault] results /home/weichen/projects/Agent-System-Dev-wt-feature-u7-ops-drills/tests/ops/results/fault-20261012-133742\n[fault] creating u7drill on 127.0.0.1:18991\n\u001b[1;34m[svc]\u001b[0m [u7drill] initdb（用户 agent，认证 scram-sha-256，数据 /home/weichen/projects/Agent-System-Dev-wt-feature-u7-ops-drills/runtime/u7drill/pgdata）\n\u001b[1;32m[svc]\u001b[0m [u7drill] 数据库已创建（未启动）：scripts/svc.sh u7drill start\n\u001b[1;34m[svc]\u001b[0m [u7drill] 连接串：scripts/svc.sh db dsn u7drill --reveal（密码存 svc.env，权限 600）\n\u001b[1;34m[svc]\u001b[0m [u7drill] 服务绑定：scripts/svc.sh <agent名> db u7drill [--db X]（运行中自动重启生效）\n\u001b[1;32m[svc]\u001b[0m [u7drill] manifest：已迁移 rev=1 instance_id=svc-u7drill-89c5dcd7f460 data=/home/weichen/projects/Agent-System-Dev-wt-feature-u7-ops-drills/runtime/u7drill/pgdata\n\u001b[1;34m[svc]\u001b[0m [u7drill] 启动 postgres：/home/weichen/projects/Agent-System-Dev-wt-feature-u7-ops-drills/runtime/u7drill/pgdata（addr 127.0.0.1:18991）\n\u001b[1;32m[svc]\u001b[0m [u7drill] 已建库：agent\n\u001b[1;32m[svc]\u001b[0m [u7drill] postgres 就绪 pid=2136931 → 127.0.0.1:18991（库 agent，用户 agent）\nNOTICE:  database \"u7drill_app\" does not exist, skipping\n[seed] profile=tiny users=3 projects/user=2 convs/project=2 messages=1000 chunks=1000\n[seed] topology: projects=6 conversations=12\n[seed] messages=1000 events=1000\n[seed] knowledge=1000 (shared owner=''=100)\n[seed] manifest=/home/weichen/projects/Agent-System-Dev-wt-feature-u7-ops-drills/tests/ops/results/fault-20261012-133742/seed-manifest.json\n[seed] done in 27ms\n[fault] phase pg-stop\n\u001b[1;34m[svc]\u001b[0m [u7drill] 停止 postgres pid=2136931（pg_ctl -m fast，优雅回写）\n\u001b[1;32m[svc]\u001b[0m [u7drill] postgres 已停止\n\u001b[1;34m[svc]\u001b[0m [u7drill] 启动 postgres：/home/weichen/projects/Agent-System-Dev-wt-feature-u7-ops-drills/runtime/u7drill/pgdata（addr 127.0.0.1:18991）\n\u001b[1;32m[svc]\u001b[0m [u7drill] postgres 就绪 pid=2170273 → 127.0.0.1:18991（库 agent，用户 agent）\n{\n  \"mode\": \"pg-stop\",\n  \"outage\": [\n    \"2026-10-12T13:37:55Z\",\n    \"2026-10-12T13:38:57Z\"\n  ],\n  \"window_attempts\": 124,\n  \"slow\": 0,\n  \"hangs\": 0,\n  \"late_success\": 1,\n  \"F1\": false,\n  \"F2\": true,\n  \"F3\": false,\n  \"F4\": false,\n  \"F5\": true,\n  \"rto_s\": 900,\n  \"recover_note\": \"restarted both serves\",\n  \"probe_alive\": false,\n  \"sqlite_files\": 0,\n  \"replay_bad\": 92,\n  \"request_dups\": \"\",\n  \"missing_confirmed\": \"0\",\n  \"sse_holes\": null,\n  \"apps_alive\": true\n}\n[fault] FAIL pg-stop criteria\n[fault] phase pg-kill\n\u001b[1;34m[svc]\u001b[0m [u7drill] 启动 postgres：/home/weichen/projects/Agent-System-Dev-wt-feature-u7-ops-drills/runtime/u7drill/pgdata（addr 127.0.0.1:18991）\n\u001b[1;32m[svc]\u001b[0m [u7drill] postgres 就绪 pid=3348905 → 127.0.0.1:18991（库 agent，用户 agent）\n",
+  "output_sha256": "f008077ec2bb3f8937c2bd9df057ab899b48e4ef0bdfc916098d08d6e07ce245",
+  "receipt_sha256": "f0814c38efc8d02b11a5d1e6f07837668c065b68f457783c4a398ef6466c0f11"
+}
+```