diff --git a/.task/feature-u7-b5-c2-load.md b/.task/feature-u7-b5-c2-load.md
index 83d61d4c..892908f6 100644
--- a/.task/feature-u7-b5-c2-load.md
+++ b/.task/feature-u7-b5-c2-load.md
@@ -319,3 +319,41 @@
   "receipt_sha256": "47a91ce0cfe265cc147e52aed197c01359f1cac7bcb5bddd463613d2fae3c6b8"
 }
 ```
+
+<!-- Local receipt: SELF. Digests detect corruption; they do not authenticate a reviewer or CI. -->
+```json
+{
+  "schema": 1,
+  "source": "SELF",
+  "timestamp": "2026-10-12T05:40:54.978503+00:00",
+  "command": "tests/load/collaboration/run_load.sh --profile smoke --seed tiny --instances 2 --skip-k6",
+  "command_sha256": "2388e58d2f26ba098bce8b89e1a99fc77a4c302a7a5ef0d5af836b1bfa1f273d",
+  "cwd": "/home/weichen/projects/Agent-System-Dev-wt-feature-u7-b5-c2-load",
+  "common_dir": "/home/weichen/projects/Agent-System-Dev/.git",
+  "before": {
+    "head": "6823a8222f0b5ddcb6608c99dc742f1dcd75ea30",
+    "branch": "feature/u7-b5-c2-load",
+    "target_branch": "main",
+    "target_head": "4bf6e4a0cf8b509320d54de2a6a41c5abb2f5bba",
+    "status": "",
+    "tracked_diff_sha256": "e3b0c44298fc1c149afbf4c8996fb92427ae41e4649b934ca495991b7852b855",
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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 89f3906c390027512ef47b5333088c3d3a019e84 modules/backend/deps/agent-system-core (v0.3.0-9-g89f3906)\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 89f3906c390027512ef47b5333088c3d3a019e84 modules/core (v0.3.0-9-g89f3906)\n 9d9b1523c87dc4ba178d143a8b966a77be9b320b modules/documents (remotes/origin/feature/svc-unified-deploy-login-key)\n d01a3ebd819da29bf7e7dd06e74c92ef34231774 modules/frontend (v0.3.0-44-gd01a3eb)\n bfecf8b51f9a0fdbd9a13590cddf8fc06b7ae700 modules/ui (v0.3.0-17-gbfecf8b)\n"
+  },
+  "after_error": null,
+  "exit_code": 0,
+  "output": "[load] 创建隔离 PG 实例 u7load（端口 18981）\n\u001b[1;34m[svc]\u001b[0m [u7load] initdb（用户 agent，认证 scram-sha-256，数据 /home/weichen/projects/Agent-System-Dev-wt-feature-u7-b5-c2-load/runtime/u7load/pgdata）\n\u001b[1;32m[svc]\u001b[0m [u7load] 数据库已创建（未启动）：scripts/svc.sh u7load start\n\u001b[1;34m[svc]\u001b[0m [u7load] 连接串：scripts/svc.sh db dsn u7load --reveal（密码存 svc.env，权限 600）\n\u001b[1;34m[svc]\u001b[0m [u7load] 服务绑定：scripts/svc.sh <agent名> db u7load [--db X]（运行中自动重启生效）\n\u001b[1;32m[svc]\u001b[0m [u7load] manifest：已迁移 rev=1 instance_id=svc-u7load-8ed0ab42c42e data=/home/weichen/projects/Agent-System-Dev-wt-feature-u7-b5-c2-load/runtime/u7load/pgdata\n\u001b[1;34m[svc]\u001b[0m [u7load] 启动 postgres：/home/weichen/projects/Agent-System-Dev-wt-feature-u7-b5-c2-load/runtime/u7load/pgdata（addr 127.0.0.1:18981）\n\u001b[1;32m[svc]\u001b[0m [u7load] 已建库：agent\n\u001b[1;32m[svc]\u001b[0m [u7load] postgres 就绪 pid=3169841 → 127.0.0.1:18981（库 agent，用户 agent）\n[load] PG DSN 已就绪（密码不回显）\n[load] 构建 backend / SSE 探针 / seed\nNOTICE:  database \"u7load_app\" does not exist, skipping\n[load] seed profile=tiny：创建 seed_u0..seed_u2\n[load] 灌入数据集（manifest → /home/weichen/projects/Agent-System-Dev-wt-feature-u7-b5-c2-load/tests/load/collaboration/results/20261012-054054/seed-manifest.json）\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-b5-c2-load/tests/load/collaboration/results/20261012-054054/seed-manifest.json\n[seed] done in 27ms\n[load] 启动实例 A 127.0.0.1:18980（mock / tier=team / auth=on / instance=u7load-a）\n[load] 启动实例 B 127.0.0.1:18982（共享 PG/artifacts / instance=u7load-b）\n[load] --skip-k6：跳过 k6 段\n[load] SSE 可见延迟探针 A（60s，10 会话）\nreport: /home/weichen/projects/Agent-System-Dev-wt-feature-u7-b5-c2-load/tests/load/collaboration/results/20261012-054054/sse-probe-a.json\nsse probe PASS: p95=3.2ms samples=119\n[load] SSE 可见延迟探针 B（60s，10 会话）\nreport: /home/weichen/projects/Agent-System-Dev-wt-feature-u7-b5-c2-load/tests/load/collaboration/results/20261012-054054/sse-probe-b.json\nsse probe PASS: p95=3.4ms samples=119\n[load] 数据不变量对账\n       k       |  v   \n---------------+------\n users         |    5\n projects      |    8\n conversations |   32\n messages      | 1476\n events        | 1476\n knowledge     | 1000\n runs          |  238\n(7 rows)\n\n        k         | v \n------------------+---\n dup_seq_per_conv | 0\n(1 row)\n\n            k            | v \n-------------------------+---\n nonterminal_orphan_runs | 0\n(1 row)\n\n[load] 对账通过：无重复 seq；孤儿 run 报告见 invariants.txt（探针正常收口应为 0）\n[load] 完成。结果目录：/home/weichen/projects/Agent-System-Dev-wt-feature-u7-b5-c2-load/tests/load/collaboration/results/20261012-054054\n",
+  "output_sha256": "fd632559cf9a2d41bcfd97b298e925a9682fc14bd541df6df0b70a1f4285950d",
+  "receipt_sha256": "42b2dc3bfba293f6813380773e29f5ef67713a714f562965af9b2ecfa16d1c3f"
+}
+```