Add package-first build and distribution workflow

docs/release-checklist.md

@@ -2,11 +2,16 @@
 
 1. Update `CHANGELOG.md` with final release notes.
 2. Bump `project.version` in `pyproject.toml`.
-3. Run:
-   - `python3 -m py_compile src/*.py tests/*.py`
-   - `python3 -m unittest discover -s tests -p 'test_*.py'`
-4. Build artifacts:
-   - `python3 -m build`
-5. Tag release:
+3. Run quality and build gates:
+   - `make release-check`
+4. Build packaging artifacts:
+   - `make package`
+5. Verify artifacts:
+   - `dist/*.whl`
+   - `dist/*.tar.gz`
+   - `dist/*.deb`
+   - `dist/arch/PKGBUILD`
+6. Tag release:
    - `git tag vX.Y.Z`
    - `git push origin vX.Y.Z`
+7. Publish release and upload package artifacts from `dist/`.