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-card-stream-r1.md(PR#100) — 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-card-stream-r1.md

@@ -1,6 +1,6 @@
 # feature/card-stream-r1 任务卡
 
-任务主记录：<PR 链接，task-finish 时填写>；状态：验收通过待合入；owner：weichen
+任务主记录：PR #100 https://git-home.u1680832.nyat.app:30319/weichen/Agent-System-Dev/pulls/100（merge a8faa967cd）；状态：已完成（回填）；owner：weichen
 
 ## 基线与授权
 
@@ -33,3 +33,9 @@
   - submit_card 路径与线协议不变；card.updated 仍整卡投影（节流=省略中间投影）。
   - 剩余（可选项）：frontend/ui 流式中视觉（shimmer）；CF-A、CF3 按提案顺序另立卡。
 | 同步前验收 | f65d89e59b6974c7a5db63be0677d192bfaa7e9c | f96c55df238f5ef19599bcbb282c7b22f9b29423 | 2026-09-30T18:22:05Z |
+
+## 闭合记录（card-autoclose 回填）
+
+- 依据：merge a8faa967cdc0fe0d20a3cb20ed17f74518b6cff7（PR #100）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 'Land card streaming (CF-S: card_begin/card_append/card_commit)' (#100) from feature/card-stream-r1 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。