- Add CODECOV_TOKEN to codecov-action uploads (required for v4)
- Change unit test coverage from single file to entire package
- Add codecov.yml with coverage thresholds and flags
Note: CODECOV_TOKEN secret must be added to repository settings.
🤖 Generated with [Claude Code](https://claude.com/claude-code)
Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>
