The `rm -f .*.bun-build` glob cleanup step fails on Windows/Git Bash
when no files match the pattern, causing `bun run build` to exit with
code 1. Since the setup script uses `set -e`, this aborts the entire
setup before skill symlinks are created.
Adding `|| true` makes the cleanup step non-fatal, which matches the
intent — it's just removing stale build artifacts if they exist.
