diff --git a/.task/feature-u7-ops-drills.md b/.task/feature-u7-ops-drills.md
index f3296591..5268e204 100644
--- a/.task/feature-u7-ops-drills.md
+++ b/.task/feature-u7-ops-drills.md
@@ -361,3 +361,41 @@
   "receipt_sha256": "d88abed850cca259fc2ddb1f349f57e618cbe7fd6e22c825c641ee232319b39a"
 }
 ```
+
+<!-- Local receipt: SELF. Digests detect corruption; they do not authenticate a reviewer or CI. -->
+```json
+{
+  "schema": 1,
+  "source": "SELF",
+  "timestamp": "2026-10-12T14:27:34.241360+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": "308f33665eb2dfaf9ae661e87df8898c3c2ecb3a",
+    "branch": "feature/u7-ops-drills",
+    "target_branch": "main",
+    "target_head": "4d362537d0e8755a03b1757b5bad92779a064b33",
+    "status": "",
+    "tracked_diff_sha256": "e3b0c44298fc1c149afbf4c8996fb92427ae41e4649b934ca495991b7852b855",
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a3ee67bba269e1276c14e22c026171ecf2cf6190 deps/agent-squad/deps/agent-native/deps/error-code-system (a3ee67b)\n 26b562d2e34fbc560711296a309c91c74ffc55b1 deps/agent-squad/deps/agent-native/deps/error-code-system/deps/development-guidelines (26b562d)\n 49b5d8be604d05e4246dffa0d10fa1c2b7ad45d7 deps/agent-squad/deps/agent-native/deps/logging-system (49b5d8b)\n 26b562d2e34fbc560711296a309c91c74ffc55b1 deps/agent-squad/deps/agent-native/deps/logging-system/deps/development-guidelines (26b562d)\n 26b562d2e34fbc560711296a309c91c74ffc55b1 deps/agent-squad/deps/development-guidelines (26b562d)\n a3ee67bba269e1276c14e22c026171ecf2cf6190 deps/agent-squad/deps/error-code-system (a3ee67b)\n 26b562d2e34fbc560711296a309c91c74ffc55b1 deps/agent-squad/deps/error-code-system/deps/development-guidelines (26b562d)\n 49b5d8be604d05e4246dffa0d10fa1c2b7ad45d7 deps/agent-squad/deps/logging-system (49b5d8b)\n 26b562d2e34fbc560711296a309c91c74ffc55b1 deps/agent-squad/deps/logging-system/deps/development-guidelines (26b562d)\n af199eeaa23c5b39e08b4649f2513d7572dc5274 deps/development-guidelines (heads/main)\n a3ee67bba269e1276c14e22c026171ecf2cf6190 deps/error-code-system (a3ee67b)\n 26b562d2e34fbc560711296a309c91c74ffc55b1 deps/error-code-system/deps/development-guidelines (26b562d)\n 49b5d8be604d05e4246dffa0d10fa1c2b7ad45d7 deps/logging-system (49b5d8b)\n 26b562d2e34fbc560711296a309c91c74ffc55b1 deps/logging-system/deps/development-guidelines (26b562d)\n 8e509775d39d1455b69be44803037faa7af844b4 modules/backend (v0.3.0-128-g8e50977)\n 4f583ca3eeeb07a56a714c5086de84dcd6ad2980 modules/backend/deps/agent-command (heads/main)\n ed2af3e6048928b1fd0ba6da1f9d0c1bafec82d4 modules/backend/deps/agent-command/deps/development-guidelines (remotes/origin/feature/delivery-mechanism-5-ged2af3e)\n 343b1e6d9a5b58e47bf7e594826221036ae8175c modules/backend/deps/agent-intent (heads/main)\n 26b562d2e34fbc560711296a309c91c74ffc55b1 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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-20261012-142734\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-91a0f726d0c7 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=773791 → 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-20261012-142734/seed-manifest.json\n[seed] done in 30ms\n[fault] phase pg-stop\n\u001b[1;34m[svc]\u001b[0m [u7drill] 停止 postgres pid=773791（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=913949 → 127.0.0.1:18991（库 agent，用户 agent）\n{\n  \"mode\": \"pg-stop\",\n  \"outage\": [\n    \"2026-10-12T14:27:48Z\",\n    \"2026-10-12T14:28:49Z\"\n  ],\n  \"window_attempts\": 122,\n  \"slow\": 0,\n  \"hangs\": 0,\n  \"late_success\": 0,\n  \"F1\": true,\n  \"F2\": true,\n  \"F3\": true,\n  \"F4\": true,\n  \"F5\": true,\n  \"rto_s\": 0,\n  \"recover_note\": \"\",\n  \"probe_alive\": false,\n  \"sqlite_files\": 0,\n  \"replay_bad\": 0,\n  \"apps_alive\": true,\n  \"request_dups\": \"\",\n  \"missing_confirmed\": \"0\",\n  \"sse_holes\": null\n}\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=1116377 → 127.0.0.1:18991（库 agent，用户 agent）\n{\n  \"mode\": \"pg-kill\",\n  \"outage\": [\n    \"2026-10-12T14:29:51Z\",\n    \"2026-10-12T14:30:53Z\"\n  ],\n  \"window_attempts\": 124,\n  \"slow\": 0,\n  \"hangs\": 0,\n  \"late_success\": 0,\n  \"F1\": true,\n  \"F2\": true,\n  \"F3\": true,\n  \"F4\": true,\n  \"F5\": true,\n  \"rto_s\": 0,\n  \"recover_note\": \"\",\n  \"probe_alive\": false,\n  \"sqlite_files\": 0,\n  \"replay_bad\": 0,\n  \"apps_alive\": true,\n  \"request_dups\": \"\",\n  \"missing_confirmed\": \"0\",\n  \"sse_holes\": null\n}\n[fault] phase redis-kill\nINSERT 0 1\n{\n  \"G1_shared_ok_429_bad\": [\n    20,\n    60,\n    0\n  ],\n  \"G1\": true,\n  \"G2_down_ok_429_bad\": [\n    40,\n    40,\n    0\n  ],\n  \"G2\": true,\n  \"G3_back_ok_429_bad\": [\n    20,\n    60,\n    0\n  ],\n  \"G3\": true,\n  \"G4_degraded_invisible\": true,\n  \"G4\": true,\n  \"G5_start_refused\": true,\n  \"G5_expected_finding\": true,\n  \"probe_exit\": 1,\n  \"permanent_keys\": [],\n  \"finding_degraded_counter_not_in_logs\": true,\n  \"finding_start_requires_redis\": true\n}\n[fault] done fail=0 results=/home/weichen/projects/Agent-System-Dev-wt-feature-u7-ops-drills/tests/ops/results/fault-20261012-142734\n",
+  "output_sha256": "e6b0923b351a83d4e429a44031fb1813508e8e63b039c86d95052c275c8da5ca",
+  "receipt_sha256": "21b511233a3a1ffda43e45b2db4ebd0860d19a3738f26745577a848a8bf7d099"
+}
+```