Add benchmark-driven model promotion workflow and pipeline stages

docs/release-checklist.md

@@ -4,14 +4,19 @@
 2. Bump `project.version` in `pyproject.toml`.
 3. Run quality and build gates:
    - `make release-check`
-4. Build packaging artifacts:
+   - `make check-default-model`
+4. Ensure model promotion artifacts are current:
+   - `benchmarks/results/latest.json` has the latest `winner_recommendation.name`
+   - `benchmarks/model_artifacts.json` contains that winner with URL + SHA256
+   - `make sync-default-model` (if constants drifted)
+5. Build packaging artifacts:
    - `make package`
-5. Verify artifacts:
+6. Verify artifacts:
    - `dist/*.whl`
    - `dist/*.tar.gz`
    - `dist/*.deb`
    - `dist/arch/PKGBUILD`
-6. Tag release:
+7. Tag release:
    - `git tag vX.Y.Z`
    - `git push origin vX.Y.Z`
-7. Publish release and upload package artifacts from `dist/`.
+8. Publish release and upload package artifacts from `dist/`.