Release checklist (v0.1.x)

• [ ] Working tree clean; no untracked artifacts.
• [ ] make lint quality security test passes with zero warnings.
• [ ] make docs (mkdocs build --strict) passes; no navigation warnings.
• [ ] docs/maintainer/docs_freeze_checklist.md reviewed and satisfied.
• [ ] api/v1/schema.yaml committed; make api-freeze passes (no drift).
• [ ] OpenAPI validation tests green; schema reachable in docs.
• [ ] README badges and docs links verified.
• [ ] CHANGELOG updated via towncrier; v0.1.0 section accurate.
• [ ] Release artifacts built (make release): wheel/sdist, SBOM, refreshed OpenAPI.
• [ ] Tags signed: git tag -s v0.1.x.
• [ ] CI workflows (ci.yml, release.yml) green on tag.