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-pin-backend-identity-cli.md(PR#477) — 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-pin-backend-identity-cli.md

@@ -1,6 +1,6 @@
 # feature/pin-backend-identity-cli 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 #477 https://git-home.u1680832.nyat.app:30319/weichen/Agent-System-Dev/pulls/477（merge 31dbab2247）；状态：已完成（回填）；owner：weichen
 
 ## 基线与授权
 
@@ -68,7 +68,7 @@
 | 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>
@@ -203,3 +203,9 @@
   "receipt_sha256": "0cac598a38c6b6c485eef72e5781571d20ff2cc82df40ae9882c4568440b1e11"
 }
 ```
+
+## 闭合记录（card-autoclose 回填）
+
+- 依据：merge 31dbab22473bdf3f85d6558a009dee89d4ea4f6b（PR #477）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 'Pin modules/backend to acabb85 for the public identity CLI' (#477) from feature/pin-backend-identity-cli 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。