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-ext-9-index-publish.md(PR#267) — 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-ext-9-index-publish.md

@@ -1,6 +1,6 @@
 # feature/ext-9-index-publish 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 #267 https://git-home.u1680832.nyat.app:30319/weichen/Agent-System-Dev/pulls/267（merge 88b5dc635c）；状态：已完成（回填）；owner：weichen
 
 ## 基线与授权
 
@@ -79,7 +79,7 @@
 | 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：完成。Backend PR #106（红→绿：EXT-9 公开面+实现）；Dev gitlink bump PR。
 - 验证：红两行（stub 未实现/开关未生效）+ 绿两行+全量 32/32 在卡；make test×2、
@@ -370,3 +370,9 @@
   "receipt_sha256": "27dab9cec4be7398b2919cc794362ae21803bb7862a2762b3414cb4f1ed1f5bb"
 }
 ```
+
+## 闭合记录（card-autoclose 回填）
+
+- 依据：merge 88b5dc635c75700dd2bb7395a17974c04d83b376（PR #267）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 'Bump backend to the EXT-9 index publish slice (Backend #106)' (#267) from feature/ext-9-index-publish 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。