diff --git a/.task/delivery-mechanism.md b/.task/delivery-mechanism.md
index c1bc4721..b48acc7d 100644
--- a/.task/delivery-mechanism.md
+++ b/.task/delivery-mechanism.md
@@ -30,3 +30,4 @@
 | 同步前验收 | 8f7cf2d9b9f45ab7c498b753e436e38fbc7726b1 | 7856d980dae4ee37e0661ce1917a722a41fd2c14 | 2026-09-30T03:49:32Z |
 | 同步前验收 | e85d1ee49f5fb6659d83a3ed3c17ba42a93d5926 | dacef643b2ceee328e929b45874574c5e6b7cd4b | 2026-09-30T03:56:11Z |
 | 同步前验收 | 05a5ae1e1ac8ef8d341170c236e9b38570e48947 | 8252363c040c30f05b799b01928b08c78288581e | 2026-09-30T04:06:02Z |
+| 同步前验收 | dca932c6da3aea34af722f2a6772e621cf6143f5 | 6acda49e04eafc08fc12a9654d96b2512799cffa | 2026-09-30T04:20:54Z |
diff --git a/.task/feature-pin-config-surface.md b/.task/feature-pin-config-surface.md
new file mode 100644
index 00000000..3e76f900
--- /dev/null
+++ b/.task/feature-pin-config-surface.md
@@ -0,0 +1,25 @@
+# feature/pin-config-surface 任务卡
+
+任务主记录：<PR 链接，task-finish 时填写>；状态：进行中；owner：weichen
+
+## 基线与授权
+
+- 权威仓：ssh://git@git-ssh.u1680832.nyat.app:31411/weichen/Agent-System-Dev.git；目标分支：main；R0（initial_base_sha）= dca932c6da3aea34af722f2a6772e621cf6143f5
+- 工作区：/home/weichen/projects/Agent-System-Dev-wt-feature-pin-config-surface（worktree）；分支：feature/pin-config-surface
+- 授权与交付终点：<本次允许的动作与终点；未授权事项写明>
+
+## 目标与非目标
+
+<预期结果、受影响入口/模块/契约；明确不做什么。>
+
+## 同步记录
+
+| 节点 | sync_base_sha | tested_head_sha | checked_at |
+|---|---|---|---|
+| 启动 | dca932c6da3aea34af722f2a6772e621cf6143f5 | dca932c6da3aea34af722f2a6772e621cf6143f5 | 2026-09-30T04:20:47Z |
+
+## 结果与验证（完成后填写）
+
+- 结果：
+- 验证：
+- 影响与剩余项：
diff --git a/modules/backend b/modules/backend
index 72e6ce66..1e621887 160000
--- a/modules/backend
+++ b/modules/backend
@@ -1 +1 @@
-Subproject commit 72e6ce66b4c6591dbf7c64b42808af5e0a4ea378
+Subproject commit 1e621887097b3ac9524d7a272f03671b15f65d1e
diff --git a/modules/documents b/modules/documents
index 22051382..84b3421b 160000
--- a/modules/documents
+++ b/modules/documents
@@ -1 +1 @@
-Subproject commit 220513825e56947fecc155d6a45347ccbc887da3
+Subproject commit 84b3421b122a1a7ae1c6a5a5fd104807a32ee12e