[voischev]

Summary

• Replace Vitest/Vite with the built-in Node.js test runner and strict assertions, keeping all 39 passing tests, two existing skipped tests and all 43 assertions.
• Compile JavaScript, declarations and source maps directly with TypeScript; use c8 for source coverage and ESLint 10 flat config for linting.
• Remove tsup, lint-staged, Husky, commitlint and automatic changelog generation. Keep seven direct development dependencies; the local audited installation shrinks from 509 to 163 packages.
• Build and check once on Node.js 24, then install the same npm tarball with production dependencies only and run the full suite on Node.js 20.19.0, 22.12.0, 22, 24 and 26.
• Store LCOV/HTML coverage in GitHub Actions artifacts instead of Coveralls.
• Simplify the README, remove badges, update the maintainer address to voischev.ivan@ya.ru, and add contributing/release instructions and a PR template in .github.
• Keep manually written release notes and run the full check through prepublishOnly before publication.

Verification

• Fresh npm ci and npm run check: build, lint, current/minimum TypeScript checks, tests with coverage and CommonJS/native ESM loading all pass.
• 39 parser tests pass against the installed tarball on Node.js 20.19.0, 22.12.0, 22.23.4, 24.22.1 and 26.12.1, without development dependencies installed in the consumer fixtures.
• Consumer types pass with TypeScript 5.3.3 and 6.0.3.
• Coverage is preserved: 99.37% statements/lines, 98.55% branches and 100% functions.
• Cleanup differential corpus: 176/176 cases unchanged against the pre-cleanup htmlparser2 12 build.
• PostHTML integration: 58 tests pass, with one existing skipped test.
• npm pack includes the expected JavaScript, declarations, source maps, metadata, README and license.
• Full npm audit: 0 vulnerabilities.
• Workflow validation with actionlint and git diff --check pass.

Compatibility

The runtime contract from #109 is preserved: Node.js ^20.19.0 || >=22.12.0, TypeScript 5.3+ consumer declarations, and the synchronous CommonJS/native ESM parser API. Development tools use Node.js 24. The runtime dependency remains htmlparser2 ^12.0.0; production source files are unchanged.

Commit prefixes are documented as optional guidance. CI and pre-publication checks provide automated validation instead of local Git hooks. Release notes are maintained manually, and the documented next parser release is 0.13.0; this PR does not publish a release.