diff --git a/.task/feature-cli-agent-fallback-chain.md b/.task/feature-cli-agent-fallback-chain.md
index c4c1b542..de672fb1 100644
--- a/.task/feature-cli-agent-fallback-chain.md
+++ b/.task/feature-cli-agent-fallback-chain.md
@@ -219,3 +219,38 @@
   "receipt_path": "/home/weichen/.cache/agent-system-dev/evidence/d05e26eda35110298bb7721e35872f95cdc6c62964c0bf8a84e6db0f06e07775.json"
 }
 ```
+
+<!-- Local receipt: SELF. Digests detect corruption; they do not authenticate a reviewer or CI. -->
+```json
+{
+  "summary_schema": 1,
+  "source": "SELF",
+  "timestamp": "2026-10-20T06:04:41.162206+00:00",
+  "command": "make task-sync",
+  "exit_code": 0,
+  "cwd": "/home/weichen/projects/Agent-System-Dev-wt-feature-cli-agent-fallback-chain",
+  "before_head": "c41e773d1e11a052ff53b32d493a3fa3e025ea99",
+  "after_head": "c41e773d1e11a052ff53b32d493a3fa3e025ea99",
+  "branch": "feature/cli-agent-fallback-chain",
+  "target_branch": "main",
+  "target_head": "d2035c76dc1cb15e01d2c184af5155d9d773cd9f",
+  "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-feature-cli-agent-fallback-chain'",
+    "[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 120: recorded HEAD predates non-card changes ——关键检查须重跑并以 make evidence 重新写入",
+    "[synced] sync_base=d2035c76dc1cb15e01d2c184af5155d9d773cd9f tested_head=c41e773d1e11a052ff53b32d493a3fa3e025ea99 checked_at=2026-10-20T06:05:34Z 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-feature-cli-agent-fallback-chain'"
+  ],
+  "output_sha256": "40878f3432df9e7aa449f4304ca79a36a9f2c9d3253e229481283dd119efc992",
+  "receipt_sha256": "cf538efd2a1d13e0f740447675779b37e3ae0db15fa78cc6553856ac2dbb6cc1",
+  "receipt_path": "/home/weichen/.cache/agent-system-dev/evidence/cf538efd2a1d13e0f740447675779b37e3ae0db15fa78cc6553856ac2dbb6cc1.json"
+}
+```