diff --git a/.task/archive/fix-multiuser-project-collab.md b/.task/archive/fix-multiuser-project-collab.md
index 995c2408..31e55624 100644
--- a/.task/archive/fix-multiuser-project-collab.md
+++ b/.task/archive/fix-multiuser-project-collab.md
@@ -305,3 +305,104 @@
 - 本卡在 PR #655（https://git-home.u1680832.nyat.app:30319/weichen/Agent-System-Dev/pulls/655）合入前闭合并归档，随该 PR 一同合入。
 - 该 PR 的合并提交即本任务的落地记录。
 - 合入后无需回填，也无需单独的闭合 PR。
+
+<!-- Local receipt: SELF. Digests detect corruption; they do not authenticate a reviewer or CI. -->
+```json
+{
+  "summary_schema": 1,
+  "source": "SELF",
+  "timestamp": "2026-10-20T11:28:46.573322+00:00",
+  "command": "make task-sync",
+  "exit_code": 0,
+  "cwd": "/home/weichen/projects/Agent-System-Dev-wt-fix-multiuser-project-collab",
+  "before_head": "023a9a8fda3997c06fbcc6f502ba024a6feee3f8",
+  "after_head": "023a9a8fda3997c06fbcc6f502ba024a6feee3f8",
+  "branch": "fix/multiuser-project-collab",
+  "target_branch": "main",
+  "target_head": "7e6c544b3c25c510e3d928bfb4515937a1cd6696",
+  "root_target": "main",
+  "immediate_target": "main",
+  "before_tracked_diff_sha256": "e3b0c44298fc1c149afbf4c8996fb92427ae41e4649b934ca495991b7852b855",
+  "after_tracked_diff_sha256": "e3b0c44298fc1c149afbf4c8996fb92427ae41e4649b934ca495991b7852b855",
+  "output_tail": [
+    "make[1]: Entering directory '/home/weichen/projects/Agent-System-Dev-wt-fix-multiuser-project-collab'",
+    "[worktree] before-sync: recursive component checks passed",
+    "[worktree] before-update: recursive component checks passed",
+    "[worktree] materialize: recursive component checks passed",
+    "[worktree] after-sync: recursive component checks passed",
+    "[evidence] WARN JSON receipt line 84: recorded HEAD predates non-card changes ——关键检查须重跑并以 make evidence 重新写入",
+    "[evidence] WARN JSON receipt line 125: recorded HEAD predates non-card changes ——关键检查须重跑并以 make evidence 重新写入",
+    "[evidence] WARN JSON receipt line 160: recorded HEAD predates non-card changes ——关键检查须重跑并以 make evidence 重新写入",
+    "[evidence] WARN JSON receipt line 192: recorded HEAD predates non-card changes ——关键检查须重跑并以 make evidence 重新写入",
+    "[evidence] WARN JSON receipt line 222: recorded HEAD predates non-card changes ——关键检查须重跑并以 make evidence 重新写入",
+    "[synced] sync_base=7e6c544b3c25c510e3d928bfb4515937a1cd6696 tested_head=023a9a8fda3997c06fbcc6f502ba024a6feee3f8 checked_at=2026-10-20T11:29:34Z changed=0 sync_target=main",
+    "[next] 跑正式验收（make test 等），证据写入任务卡",
+    "make[1]: Leaving directory '/home/weichen/projects/Agent-System-Dev-wt-fix-multiuser-project-collab'"
+  ],
+  "output_sha256": "5ee4f14f0b8c5f037c749403371d2968072430ef8e3a8f4f703ae453da2871dd",
+  "receipt_sha256": "b4b35311e3dca73bca2ff74e68939447df49fec30a77871d65267dd0c5591f1a",
+  "receipt_path": "/home/weichen/.cache/agent-system-dev/evidence/b4b35311e3dca73bca2ff74e68939447df49fec30a77871d65267dd0c5591f1a.json"
+}
+```
+
+<!-- Local receipt: SELF. Digests detect corruption; they do not authenticate a reviewer or CI. -->
+```json
+{
+  "summary_schema": 1,
+  "source": "SELF",
+  "timestamp": "2026-10-20T11:29:37.583078+00:00",
+  "command": "make task-pr-check",
+  "exit_code": 2,
+  "cwd": "/home/weichen/projects/Agent-System-Dev-wt-fix-multiuser-project-collab",
+  "before_head": "023a9a8fda3997c06fbcc6f502ba024a6feee3f8",
+  "after_head": "023a9a8fda3997c06fbcc6f502ba024a6feee3f8",
+  "branch": "fix/multiuser-project-collab",
+  "target_branch": "main",
+  "target_head": "7e6c544b3c25c510e3d928bfb4515937a1cd6696",
+  "root_target": "main",
+  "immediate_target": "main",
+  "before_tracked_diff_sha256": "cc9b52b54d86b87b7534dc01be2fc84da3725aea9f6d62c7a336be0ef7cff74b",
+  "after_tracked_diff_sha256": "cc9b52b54d86b87b7534dc01be2fc84da3725aea9f6d62c7a336be0ef7cff74b",
+  "output_tail": [
+    "make[1]: Entering directory '/home/weichen/projects/Agent-System-Dev-wt-fix-multiuser-project-collab'",
+    "python3 scripts/task_pr_check.py local  ",
+    "[pr-check] FAIL git ls-remote origin failed",
+    "[verdict] REMOTE_UNVERIFIED",
+    "make[1]: *** [Makefile:68: task-pr-check] Error 6",
+    "make[1]: Leaving directory '/home/weichen/projects/Agent-System-Dev-wt-fix-multiuser-project-collab'"
+  ],
+  "output_sha256": "fb1007c4d45c061a8810663ae344d2c3f54057073825e85f98568b4a1426c8d0",
+  "receipt_sha256": "31fda187427327a0c17ffde6d28e1dabb6336dc11d5b1209238f21f794054fc4",
+  "receipt_path": "/home/weichen/.cache/agent-system-dev/evidence/31fda187427327a0c17ffde6d28e1dabb6336dc11d5b1209238f21f794054fc4.json"
+}
+```
+
+<!-- Local receipt: SELF. Digests detect corruption; they do not authenticate a reviewer or CI. -->
+```json
+{
+  "summary_schema": 1,
+  "source": "SELF",
+  "timestamp": "2026-10-20T11:29:45.059295+00:00",
+  "command": "make task-pr-check",
+  "exit_code": 0,
+  "cwd": "/home/weichen/projects/Agent-System-Dev-wt-fix-multiuser-project-collab",
+  "before_head": "023a9a8fda3997c06fbcc6f502ba024a6feee3f8",
+  "after_head": "023a9a8fda3997c06fbcc6f502ba024a6feee3f8",
+  "branch": "fix/multiuser-project-collab",
+  "target_branch": "main",
+  "target_head": "7e6c544b3c25c510e3d928bfb4515937a1cd6696",
+  "root_target": "main",
+  "immediate_target": "main",
+  "before_tracked_diff_sha256": "d68c6a62f6367e6cb656461c254cc5fb4c8879b9dbe4b912cc4d26b85cf417c9",
+  "after_tracked_diff_sha256": "d68c6a62f6367e6cb656461c254cc5fb4c8879b9dbe4b912cc4d26b85cf417c9",
+  "output_tail": [
+    "make[1]: Entering directory '/home/weichen/projects/Agent-System-Dev-wt-fix-multiuser-project-collab'",
+    "python3 scripts/task_pr_check.py local  ",
+    "[verdict] PR_CHECK_OK base=main head=023a9a8fda3997c06fbcc6f502ba024a6feee3f8 kind=standalone",
+    "make[1]: Leaving directory '/home/weichen/projects/Agent-System-Dev-wt-fix-multiuser-project-collab'"
+  ],
+  "output_sha256": "9a94717d232243fac9879b6008ea43df253ca6e48c8f0ad10cd66ae6f0482b45",
+  "receipt_sha256": "fac9b75d815eff6c9ee055f2e6f4da9e714176f8cfd8a716554749062c938183",
+  "receipt_path": "/home/weichen/.cache/agent-system-dev/evidence/fac9b75d815eff6c9ee055f2e6f4da9e714176f8cfd8a716554749062c938183.json"
+}
+```