- Add confirm_purge_cleanup() to show item count + size and require
explicit Enter/y confirmation before any deletion
- Two-pass layout in clean_project_artifacts: pass 1 collects data,
pre-scan finds max path and artifact widths, pass 2 formats with
consistent column alignment across all rows
- Adaptive footer hints in select_purge_categories degrade gracefully
on narrow terminals (full → reduced → minimal)
- Use printf '\033[J' to clear stale content when list height shrinks
- Guard empty-array expansions with ${arr[*]-} for set -u safety
- Add BATS tests for confirm_purge_cleanup (Enter confirm, ESC cancel)
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