feat(npm) ✨ Add npm package workflow

[haskou]

Summary

• Add an npm publish job to the CI workflow, following the release pattern used by haskou/eslint-config.
• Publish the package when a pull request is merged into main or master from a feat, fix, or break branch.
• Compute the next npm version automatically from the source branch type.
• Commit the release version, create a git tag, and generate GitHub release notes after publishing.
• Keep the verification job running lint, typecheck, coverage tests, docs build, and an npm package dry run.

Notes

This workflow uses npm trusted publishing through GitHub Actions OIDC permissions, so the repository/package must be configured as a trusted publisher in npm before the first publish run.

Validation

Not run locally. Workflow-only change.

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