diff --git a/.task/feature-fast-slow-u2-u3-plan.md b/.task/feature-fast-slow-u2-u3-plan.md
index 6fff9413..8454d8e6 100644
--- a/.task/feature-fast-slow-u2-u3-plan.md
+++ b/.task/feature-fast-slow-u2-u3-plan.md
@@ -80,6 +80,8 @@ r0.3首次组合失败与修复：Dev 6734665 的 `make test && make build` exit
 
 r0.3修正后组合：Dev f7e55c3 的 `make test && make build` exit0，`SELF` 完整收据 `/tmp/fast-slow-u3-r03-20261013/combo-fixed-receipt.json` 已由工具导入下方；固定 Core b474394、Backend 62ad895、Frontend 9d7681c、UI ac5b617、Documents f64fe11。测试只证明零付费机制与构建，真实模型质量仍 NOT_RUN。实际HTTP浏览器先增加“集合归属待确认”断言，旧机制夹具的浏览器首测按预期失败、后台不抢焦点的第二项通过；原机制实例已按PID停止，失败trace保留。Backend 756679d 在假流第二批加入有来源的总量/首期/接口依赖前提及无依据归属候选，让宿主归一化；Frontend 006c815 保存浏览器断言。新固定组合和新浏览器实例待验证，不沿用 f7e55c3 的绿色结果。
 
+r0.3真实HTTP机制复验：Dev b10a218、Backend 756679d、Frontend 006c815 的任务自有机制二进制和 preview 经 PID、二进制 SHA、组件 SHA、独立 SQLite 数据目录检查；两项 Playwright exit0，包括宿主生成的“材料未说明具体归属”待确认卡、来源跳转/变更版本提示及后台不抢文件、焦点、视口。完整 `SELF` 收据 `/tmp/fast-slow-u3-r03-20261013/browser-c-receipt.json` 已由工具导入下方，截图和trace保留；服务与preview按本轮PID停止。第一次启动因目录名未满足测试入口前缀被拒，未触及任何服务；失败日志保留。该假流机制通过不代表新真实模型质量或最终正文通过。Documents `21fbc9d` 已更新核验报告，新的精确Dev组合、独立复审及当前HEAD GATE仍待核验。
+
 详见modules/documents/docs/reports/2026-10-13-fast-slow-u2-u3-validation.md。历史已验组合7fd5288（Backend6a2d85c、FE3087b06、Core6e38574、UI3b34dfd、Docs53a7d37）的make test/build通过（治理311、FE224、UI156、完整后端及构建）；PG恢复和两项来源/阅读实际浏览器用例亦通过。完整SELF原始收据如下，独立代码复审已闭合，未把先前SHA冒充新对象。原六真实样本211974 reported tokens；A01/A02语义失败，A04预算耗尽保留部分发现。原始失败、引用核验与评測局限保留。
 
 ## 规划进展与下一步
@@ -6276,3 +6278,41 @@ Dev草稿PR #512及Core #31、Backend #193、Frontend #79、UI #51、Documents #
   "receipt_sha256": "0edd2438269586ea6c7c5816709ab916fbfed29a70be749cfb63e650d6b1baf0"
 }
 ```
+
+<!-- Local receipt: SELF. Digests detect corruption; they do not authenticate a reviewer or CI. -->
+```json
+{
+  "schema": 1,
+  "source": "SELF",
+  "timestamp": "2026-10-13T17:03:16.021959+00:00",
+  "command": "bash /tmp/fast-slow-u3-r03-20261013/verify-browser-c.sh",
+  "command_sha256": "d3724c2fc637f244d3c2446e7bf07eb82aef90aee97439dbc98b0ac8e97c641d",
+  "cwd": "/home/weichen/projects/Agent-System-Dev-wt-feature-fast-slow-u2-u3-plan",
+  "common_dir": "/home/weichen/projects/Agent-System-Dev/.git",
+  "before": {
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+    "branch": "feature/fast-slow-u2-u3-plan",
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+    "tracked_diff_sha256": "e3b0c44298fc1c149afbf4c8996fb92427ae41e4649b934ca495991b7852b855",
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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 756679daceab20703ec318609404459f3e83514f modules/backend (v0.3.0-207-g756679d)\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-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 b4743949e525f5e6a6dbce6509e221cac6d15db5 modules/backend/deps/agent-system-core (v0.3.0-24-gb474394)\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 b4743949e525f5e6a6dbce6509e221cac6d15db5 modules/core (v0.3.0-24-gb474394)\n f64fe11c55486afff48f35b703ffc6d26d9e4681 modules/documents (heads/feature/fast-slow-u2-u3-plan)\n 006c81567546deb1cbd95abbb7ca6a36f99241b2 modules/frontend (v0.3.0-113-g006c815)\n ac5b617e9e7ee6b9417b36c66d7c6e3b58ecbb42 modules/ui (v0.3.0-40-gac5b617)\n"
+  },
+  "after_error": null,
+  "exit_code": 0,
+  "output": "mechanism binary and fixed SHA verified\n\n> agent-system-frontend@0.1.0 e2e\n> playwright test e2e/work-checkpoints.playwright.ts\n\n\nRunning 2 tests using 1 worker\n\n(node:3560700) Warning: The 'NO_COLOR' env is ignored due to the 'FORCE_COLOR' env being set.\n(Use `node --trace-warnings ...` to show where the warning was created)\n  ✓  1 e2e/work-checkpoints.playwright.ts:33:1 › real HTTP task recovery, source navigation and changed-version limitation (1.3s)\n  ✓  2 e2e/work-checkpoints.playwright.ts:50:1 › background replay does not steal the current file, focus or viewport (1.9s)\n\n  2 passed (3.6s)\n",
+  "output_sha256": "86e06033698188d225b50db6f4cd624927087ab20c005d5fb5ddd343845cf86a",
+  "receipt_sha256": "29d4e60501b06834e5564b5d42839661c24ff143aaaf983e14962c5d98589397"
+}
+```
diff --git a/modules/documents b/modules/documents
index f64fe11c..21fbc9de 160000
--- a/modules/documents
+++ b/modules/documents
@@ -1 +1 @@
-Subproject commit f64fe11c55486afff48f35b703ffc6d26d9e4681
+Subproject commit 21fbc9de3432deb69081693fdd27b36933cebda0