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-file-preview-proposal.md(PR#77) — 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-file-preview-proposal.md

@@ -1,6 +1,6 @@
 # feature/file-preview-proposal 任务卡
 
-任务主记录：<PR 链接，task-finish 时填写>；状态：进行中；owner：weichen
+任务主记录：PR #77 https://git-home.u1680832.nyat.app:30319/weichen/Agent-System-Dev/pulls/77（merge a3f3cb0a84）；状态：已完成（回填）；owner：weichen
 
 ## 基线与授权
 
@@ -27,8 +27,14 @@
 |---|---|---|---|
 | 启动 | 425c6e63f22fff0d200cfcbebd764fe0ed46c637 | 425c6e63f22fff0d200cfcbebd764fe0ed46c637 | 2026-09-30T15:55:17Z |
 
-## 结果与验证（完成后填写）
+## 结果与验证
 
 - 结果：
 - 验证：
 - 影响与剩余项：
+
+## 闭合记录（card-autoclose 回填）
+
+- 依据：merge a3f3cb0a841c7d918982b24590bb58bcf804a2ad（PR #77）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 the file-preview proposal and restore the regressed module gitlinks' (#77) from feature/file-preview-proposal 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。