* chore: add script to clean up worktrees with merged PRs
Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>
* fix: use safe arithmetic to avoid set -e exit on zero increment
Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>
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Co-authored-by: Claude Opus 4.6 <noreply@anthropic.com>