Close 1 merged task card(s) and archive them

Why: branches merged into their immediate or root target had left their task cards open; backfill status and archive to prevent bookkeeping debt.
Evidence: final-cleanup-summary.md(PR#650 into main) — merges verified via git log --merges plus Gitea API squash lookup against each card's origin target.
Impact: .task/*.md moved to .task/archive/ with status backfilled; no code or submodule change.
Refs: task.sh close (card-autoclose-r1)

.task/archive/final-cleanup-summary.md

@@ -1,6 +1,6 @@
 # L1 最终收尾汇总 任务卡
 
-任务主记录：Dev PR #650（本文件随 PR 描述维护）；状态：待合入；owner：weichen。
+任务主记录：PR #650 https://git-home.u1680832.nyat.app:30319/weichen/Agent-System-Dev/pulls/650（merge 873e957306）；状态：已完成（回填）；owner：weichen。
 
 ## 基线与授权
 
@@ -128,3 +128,9 @@
   "receipt_path": "/home/weichen/.cache/agent-system-dev/evidence/a52668c28d07c7e3b2f43a7730937a9a55172fcca7678ae361e919df197daab4.json"
 }
 ```
+
+## 闭合记录（card-autoclose 回填）
+
+- 依据：merge 873e957306a791eaa36e5251b45e3ed44a863143（PR #650）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 'L1 final cleanup summary (4 follow-up items: migration verification, spec sync, U7C closure, status)' (#650) from feature/l1-final-cleanup-summary 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。