Healthcheck Bun compatibility

The package targets Bun-compatible globals and depends on current core. Optional server counters follow the BunServerLike contract and may be absent.

It publishes ESM, CommonJS, and declarations. There is no package-local test script in the current manifest, so compatibility is based on source contracts and workspace build/lint—not an asserted multi-version Bun matrix.

No minimum or currently verified Bun version is declared. Use the Bun version pinned by your application and run the Quick start under that exact runtime before adopting the integration.