v1.6.5

1.6.5\n\n### Fixed\n- Published package ESM import resolution by switching runtime relative imports to explicit .js specifiers, fixing Node ERR_MODULE_NOT_FOUND for installed consumers.\n\n### Added\n- Tarball consumer smoke test (npm run test:package) that packs, installs in a clean temp project, and verifies both require and import entrypoints.\n- CI and publish workflow gates now run npm run test:package before release publish.