Why: branches merged into main had left their task cards open; backfill status and archive to prevent bookkeeping debt.
Evidence: feature-agent-s0-workspace-overlay.md(PR#318) — 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)
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闭卡:feature/agent-s0-workspace-overlay(主记录 PR #318);附带 documents S0-1 回填指针。