Why: branches merged into main had left their task cards open; backfill status and archive to prevent bookkeeping debt.
Evidence: feature-agent-stack-r2.md(PR#154) — merge 0a047db verified on origin/main. The merge subject did not match the from-branch pattern, so task.sh close skipped it.
Impact: .task/feature-agent-stack-r2.md moved to .task/archive/ with status backfilled; no code or submodule change.
Refs: task.sh close (card-autoclose-r1)
Co-authored-by: Cursor <cursoragent@cursor.com>