Close 1 merged task card(s) and archive them

Why: branches merged into main had left their task cards open; backfill status and archive to prevent bookkeeping debt.
Evidence: feature-recovery-u1-db-identity.md(PR#426) — merges verified via git log --merges against origin/main.
Impact: .task/*.md moved to .task/archive/ with status backfilled; no code or submodule change.
Refs: task.sh close (card-autoclose-r1)

.task/archive/feature-recovery-u1-db-identity.md

@@ -1,6 +1,6 @@
 # feature/recovery-u1-db-identity 任务卡
 
-任务主记录：Dev PR #426 https://git-home.u1680832.nyat.app:30319/weichen/Agent-System-Dev/pulls/426（Backend #170）；父 #415 / 设计 docs/recovery/u1-identity-manifest.md §5.2；状态：进行中；owner：weichen
+任务主记录：Dev PR #426 https://git-home.u1680832.nyat.app:30319/weichen/Agent-System-Dev/pulls/426（Backend #170）；父 #415 / 设计 docs/recovery/u1-identity-manifest.md §5.2；状态：已完成（回填）；owner：weichen
 
 ## 基线与授权
 
@@ -69,7 +69,7 @@
 | 时间(UTC) | 命令 | 被测HEAD | exit | 来源 | sha256(16) |
 |---|---|---|---|---|---|
 
-## 结果与验证（完成后填写）
+## 结果与验证
 
 - 结果：
 - 验证：<结论摘要 PASS/FAIL/SKIP/NOT_RUN 逐项；逐条证据由 make evidence 写入上方证据表>
@@ -211,3 +211,9 @@
 }
 ```
 | 同步前验收 | 673e687c5c85b9af3ce13ca30845d5e68de5dfa0 | ee7903344f6f5e954dcb1edd8e02f9b6a3b8544c | 2026-10-12T05:27:52Z |
+
+## 闭合记录（card-autoclose 回填）
+
+- 依据：merge 4bf6e4a0cf8b509320d54de2a6a41c5abb2f5bba（PR #426）已包含于 origin/main，分支成果已落盘；本段为合入后回填。
+- 合并主题：Merge pull request 'Implement U1 I3 DB identity marker (agent_system_identity)' (#426) from feature/recovery-u1-db-identity into main
+- 归档：随闭合移入 .task/archive/；任务执行期的过程证据见原任务记录与 PR。