npm scripts pass `tests/*.test.cjs` to node/c8 as a literal string on
Windows (PowerShell/cmd don't expand globs). Adding `shell: bash` to CI
steps doesn't help because c8 spawns node as a child process using the
system shell. Use a Node script to enumerate test files cross-platform.
Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>
