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-agent-quality-phase01.md(PR#277) — 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-agent-quality-phase01.md

@@ -1,6 +1,6 @@
 # feature/agent-quality-phase01 任务卡
 
-任务主记录：<PR 链接，交付前填写>；状态：进行中；owner：weichen
+任务主记录：PR #277 https://git-home.u1680832.nyat.app:30319/weichen/Agent-System-Dev/pulls/277（merge 4deddf458d）；状态：已完成（回填）；owner：weichen
 
 ## 基线与授权
 
@@ -272,3 +272,9 @@
   "receipt_sha256": "0f4fce940874d502f2f7f5a441628d226c02b7a783b4c1196d94f928ac545571"
 }
 ```
+
+## 闭合记录（card-autoclose 回填）
+
+- 依据：merge 4deddf458db446f59ae016d529a7cd61bb59ed11（PR #277）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 'Quality phase01: gate repairs, live eval baseline, policy clause (Backend #111, Documents #51)' (#277) from feature/agent-quality-phase01 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。