Bun Test Coverage

Covers everything you need for test coverage in Bun without pulling in Istanbul or nyc. You get the coverage flag, lcov output for CI tools like Codecov, configurable thresholds that'll fail your builds, and patterns to exclude test files or fixtures. The bunfig.toml setup is straightforward, and the GitHub Actions example shows exactly how to pipe coverage reports where they need to go. Honestly the built-in reporter is clear enough that you might not need external dashboards for smaller projects. Good reference when you're setting coverage requirements or need to debug why certain files aren't showing up in reports.