CI installed `ruff>=0.4.0,<0.5` (resolves 0.4.10) while contributors
run modern ruff (0.5+). ruff 0.5 changed assert-message formatting, so
valid code formatted by a current ruff fails CI's `ruff format --check .`
on layout alone. This blocked #1438, #1445, and #1528 — each needing a
manual reformat-and-push cycle with no actual code defect.
Pin an exact, modern ruff in both pyproject dev lists and in ci.yml so
CI and `pip install -e ".[dev]"` format/lint identically. No new
`ruff check` violations under the existing E/F/W/C901 select.
Igor Lins e Silva
96a327233d