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-development-governance-v2.md(PR#585 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-development-governance-v2.md

@@ -1,6 +1,6 @@
 # feature/development-governance-v2 任务卡
 
-任务主记录：PR #585 https://git-home.u1680832.nyat.app:30319/weichen/Agent-System-Dev/pulls/585；状态：进行中；owner：weichen
+任务主记录：PR #585 https://git-home.u1680832.nyat.app:30319/weichen/Agent-System-Dev/pulls/585；状态：已完成（回填）；owner：weichen
 
 ## 基线与授权
 
@@ -419,3 +419,9 @@
   "receipt_sha256": "38486f912392fd2a4b434de079d476179dd607f402e418934abded083cf0cba7"
 }
 ```
+
+## 闭合记录（card-autoclose 回填）
+
+- 依据：merge aee351ae1ab8306ba4b52d74b5ba8feb9b77afda（PR #585）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 two-level branching model and align agent execution governance v2' (#585) from feature/development-governance-v2 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。