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: feature-dev-shared-executor-switch.md(PR#600 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/feature-dev-shared-executor-switch.md

@@ -1,6 +1,6 @@
 # feature/dev-shared-executor-switch 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 #600 https://git-home.u1680832.nyat.app:30319/weichen/Agent-System-Dev/pulls/600（merge a5829c271c）；状态：已完成（回填）；owner：weichen
 
 ## 基线与授权
 
@@ -105,7 +105,7 @@
 - 调度依据：policy/merge-queue.md；新模式启用前按既有交付门禁
 - 固定后证据：源码外 RECEIPT；实际结果后按授权原样导入和闭合
 
-## 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>
@@ -369,3 +369,9 @@
   "receipt_sha256": "3d534ee0e9a70471836b6c0fc7a1aa8c4b0dc418788cbd184d0cdedb887a78bd"
 }
 ```
+
+## 闭合记录（card-autoclose 回填）
+
+- 依据：merge a5829c271c92c2e7c525206eb831b0d6e9c877a6（PR #600）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 'Switch Dev to the pinned shared executor and retire the Python executor' (#600) from feature/dev-shared-executor-switch 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。