chore(versioning): apply pre-commit autofixes (ruff + auto-walrus)

- ruff: import sort + E501 reflow on the parent-state guard in
  baseline.py
- ruff format: function-signature collapse and join-chain reflow in
  queries.py
- auto-walrus: two ``entity_kind = …; if … is not None:`` patterns
  in queries.py converted to assignment-expressions