Push builds have been RED on the lint step since ~build 209 from accumulated
formatting drift. This is the mechanical cleanup: ruff format + ruff --fix
(UP038 isinstance unions, SIM105 contextlib.suppress, UP031 f-strings, SIM115
tempfile context manager), shfmt -i 2 -ci, nixpkgs-fmt/statix/deadnix (merged
attrsets, dropped unused lib args), yamllint, and shell quoting fixes in
tests/lasuite-docs/setup_custom_tests.sh. No behaviour changes intended;
lint: PASS, unit tests: 138 passed.
_discourse.py: bootstrap an admin (recipe seeds none) + mint an ApiKey via rails runner in the app
container (class-B run-scoped). test_create_topic.py: POST /posts.json (unique marker) -> GET
/t/<id>.json title+cooked round-trip. test_site_basic.py: GET /site.json asserts discourse categories
config. Meets P3 (>=2 functional beyond health).
