diff --git a/.task/feature-u7-ops-drills.md b/.task/feature-u7-ops-drills.md
index 428d4d85..a0db0fd1 100644
--- a/.task/feature-u7-ops-drills.md
+++ b/.task/feature-u7-ops-drills.md
@@ -551,3 +551,41 @@
   "receipt_sha256": "8a0947e258941ee634b7315ab6c8d824e70654573b705cc0a500230946c7f923"
 }
 ```
+
+<!-- Local receipt: SELF. Digests detect corruption; they do not authenticate a reviewer or CI. -->
+```json
+{
+  "schema": 1,
+  "source": "SELF",
+  "timestamp": "2026-10-12T15:34:41.465191+00:00",
+  "command": "tests/ops/run_backup_drill.sh",
+  "command_sha256": "4e74cabb936aa18258193b3a606aa2b3b26c8280247b4592666969f93c48b2ec",
+  "cwd": "/home/weichen/projects/Agent-System-Dev-wt-feature-u7-ops-drills",
+  "common_dir": "/home/weichen/projects/Agent-System-Dev/.git",
+  "before": {
+    "head": "792574692609d9bfdf113e2dc5af6f43c9a176dd",
+    "branch": "feature/u7-ops-drills",
+    "target_branch": "main",
+    "target_head": "99048dda1f48bccb3d5d798050d7beeea2907177",
+    "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 modules/backend/deps/agent-intent/deps/development-guidelines (26b562d)\n a3ee67bba269e1276c14e22c026171ecf2cf6190 modules/backend/deps/agent-intent/deps/error-code-system (a3ee67b)\n 26b562d2e34fbc560711296a309c91c74ffc55b1 modules/backend/deps/agent-intent/deps/error-code-system/deps/development-guidelines (26b562d)\n 49b5d8be604d05e4246dffa0d10fa1c2b7ad45d7 modules/backend/deps/agent-intent/deps/logging-system (49b5d8b)\n 26b562d2e34fbc560711296a309c91c74ffc55b1 modules/backend/deps/agent-intent/deps/logging-system/deps/development-guidelines (26b562d)\n c348441691e8bdab784a03aa9be64d53dacff341 modules/backend/deps/agent-native (heads/main)\n 343b1e6d9a5b58e47bf7e594826221036ae8175c modules/backend/deps/agent-native/deps/agent-intent (heads/main)\n 26b562d2e34fbc560711296a309c91c74ffc55b1 modules/backend/deps/agent-native/deps/agent-intent/deps/development-guidelines (26b562d)\n a3ee67bba269e1276c14e22c026171ecf2cf6190 modules/backend/deps/agent-native/deps/agent-intent/deps/error-code-system (a3ee67b)\n 26b562d2e34fbc560711296a309c91c74ffc55b1 modules/backend/deps/agent-native/deps/agent-intent/deps/error-code-system/deps/development-guidelines (26b562d)\n 49b5d8be604d05e4246dffa0d10fa1c2b7ad45d7 modules/backend/deps/agent-native/deps/agent-intent/deps/logging-system (49b5d8b)\n 26b562d2e34fbc560711296a309c91c74ffc55b1 modules/backend/deps/agent-native/deps/agent-intent/deps/logging-system/deps/development-guidelines (26b562d)\n 26b562d2e34fbc560711296a309c91c74ffc55b1 modules/backend/deps/agent-native/deps/development-guidelines (26b562d)\n a3ee67bba269e1276c14e22c026171ecf2cf6190 modules/backend/deps/agent-native/deps/error-code-system (a3ee67b)\n 26b562d2e34fbc560711296a309c91c74ffc55b1 modules/backend/deps/agent-native/deps/error-code-system/deps/development-guidelines (26b562d)\n 49b5d8be604d05e4246dffa0d10fa1c2b7ad45d7 modules/backend/deps/agent-native/deps/logging-system (49b5d8b)\n 26b562d2e34fbc560711296a309c91c74ffc55b1 modules/backend/deps/agent-native/deps/logging-system/deps/development-guidelines (26b562d)\n 490b0b2dfa1567cb16ff7a7230fd78e52bc2938e modules/backend/deps/agent-squad (heads/main)\n 343b1e6d9a5b58e47bf7e594826221036ae8175c modules/backend/deps/agent-squad/deps/agent-intent (heads/main)\n 26b562d2e34fbc560711296a309c91c74ffc55b1 modules/backend/deps/agent-squad/deps/agent-intent/deps/development-guidelines (26b562d)\n a3ee67bba269e1276c14e22c026171ecf2cf6190 modules/backend/deps/agent-squad/deps/agent-intent/deps/error-code-system (a3ee67b)\n 26b562d2e34fbc560711296a309c91c74ffc55b1 modules/backend/deps/agent-squad/deps/agent-intent/deps/error-code-system/deps/development-guidelines (26b562d)\n 49b5d8be604d05e4246dffa0d10fa1c2b7ad45d7 modules/backend/deps/agent-squad/deps/agent-intent/deps/logging-system (49b5d8b)\n 26b562d2e34fbc560711296a309c91c74ffc55b1 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": 1,
+  "output": "[backup] results /home/weichen/projects/Agent-System-Dev-wt-feature-u7-ops-drills/tests/ops/results/backup-20261012-153441\n[backup] creating u7bk on 127.0.0.1:18994\n\u001b[1;34m[svc]\u001b[0m [u7bk] initdb（用户 agent，认证 scram-sha-256，数据 /home/weichen/projects/Agent-System-Dev-wt-feature-u7-ops-drills/runtime/u7bk/pgdata）\n\u001b[1;32m[svc]\u001b[0m [u7bk] 数据库已创建（未启动）：scripts/svc.sh u7bk start\n\u001b[1;34m[svc]\u001b[0m [u7bk] 连接串：scripts/svc.sh db dsn u7bk --reveal（密码存 svc.env，权限 600）\n\u001b[1;34m[svc]\u001b[0m [u7bk] 服务绑定：scripts/svc.sh <agent名> db u7bk [--db X]（运行中自动重启生效）\n\u001b[1;32m[svc]\u001b[0m [u7bk] manifest：已迁移 rev=1 instance_id=svc-u7bk-416571d9fe11 data=/home/weichen/projects/Agent-System-Dev-wt-feature-u7-ops-drills/runtime/u7bk/pgdata\n\u001b[1;34m[svc]\u001b[0m [u7bk] 启动 postgres：/home/weichen/projects/Agent-System-Dev-wt-feature-u7-ops-drills/runtime/u7bk/pgdata（addr 127.0.0.1:18994）\n\u001b[1;32m[svc]\u001b[0m [u7bk] 已建库：agent\n\u001b[1;32m[svc]\u001b[0m [u7bk] postgres 就绪 pid=1867552 → 127.0.0.1:18994（库 agent，用户 agent）\n\u001b[1;34m[svc]\u001b[0m [u7bk] 停止 postgres pid=1867552（pg_ctl -m fast，优雅回写）\n\u001b[1;32m[svc]\u001b[0m [u7bk] postgres 已停止\n\u001b[1;34m[svc]\u001b[0m [u7bk] 启动 postgres：/home/weichen/projects/Agent-System-Dev-wt-feature-u7-ops-drills/runtime/u7bk/pgdata（addr 127.0.0.1:18994）\n\u001b[1;32m[svc]\u001b[0m [u7bk] postgres 就绪 pid=1867935 → 127.0.0.1:18994（库 agent，用户 agent）\n[backup] wal_level=replica archive_mode=on\nNOTICE:  database \"u7bk_app\" does not exist, skipping\n[backup] seeding contract\n[seed] profile=contract users=10 projects/user=5 convs/project=10 messages=1000000 chunks=100000\n[seed] topology: projects=50 conversations=500\n[seed] … messages 100000/1000000\n[seed] … messages 200000/1000000\n[seed] … messages 300000/1000000\n[seed] … messages 400000/1000000\n[seed] … messages 500000/1000000\n[seed] … messages 600000/1000000\n[seed] … messages 700000/1000000\n[seed] … messages 800000/1000000\n[seed] … messages 900000/1000000\n[seed] … messages 1000000/1000000\n[seed] messages=1000000 events=1000000\n[seed] knowledge=100000 (shared owner=''=10000)\n[seed] manifest=/home/weichen/projects/Agent-System-Dev-wt-feature-u7-ops-drills/tests/ops/results/backup-20261012-153441/seed-manifest.json\n[seed] done in 13144ms\n[backup] archiver archived=52 failed=0\n[backup] base backup\n[backup] base_s=1 verify_ec=0\n[backup] logical dump\n\u001b[1;34m[svc]\u001b[0m [u7bk] pg_dump u7bk_app → /home/weichen/projects/Agent-System-Dev-wt-feature-u7-ops-drills/tests/ops/results/backup-20261012-153441/backup/logical.dump\n\u001b[1;32m[svc]\u001b[0m [u7bk] 备份完成：/home/weichen/projects/Agent-System-Dev-wt-feature-u7-ops-drills/tests/ops/results/backup-20261012-153441/backup/logical.dump（18M）\n[backup] dump_s=1 verify_ec=0 list_ec=0\n[backup] markers for 5 minutes\n[backup] disaster immediate stop at 2026-10-12T15:41:01.916611967Z\nwaiting for server to shut down.... done\nserver stopped\n[backup] restore to new data directory on 18997\nwaiting for server to start.... done\nserver started\n[backup] promoted=1\n[backup] rto_s=4\n[backup] settle 120s\n[backup] logical restore\nNOTICE:  database \"u7bk_logical\" does not exist, skipping\n[backup] logical_s=4 logical_ec=0\n{\n  \"K1\": true,\n  \"K2\": true,\n  \"K3\": true,\n  \"K4\": false,\n  \"K5\": true,\n  \"K6\": true,\n  \"K7\": true,\n  \"rpo_s\": 64.314262,\n  \"rto_s\": 4,\n  \"secret_leak\": <redacted>,\n  \"orphans\": \"0\"\n}\n[backup] done fail=1 results=/home/weichen/projects/Agent-System-Dev-wt-feature-u7-ops-drills/tests/ops/results/backup-20261012-153441\n",
+  "output_sha256": "d2b92ae101b87756357ee630ba6d8e0b20e1db1131da8c598d096eaffd3805ee",
+  "receipt_sha256": "6f5edd48f72fd50868d3e1342fa593eab90ad84bfcbf706485ab43a9a128dae3"
+}
+```