Fix the 13 errors that surfaced under mypy --check-untyped-defs so the
flag can be turned on permanently in pyproject.toml, and drop the
advisory exit-0 wrapper on the mypy pre-commit hook now that the tree is
clean.
- _plugin_manager: rename colliding loop vars (module/name were reused
with conflicting types) and guard spec/spec.loader from
spec_from_file_location; call __init__ via the class in __setstate__.
- __main__: pass Verbosity(options.verbose), not a bare int.
- subprocess/_check: widen package to str | Mapping[str, str] to match
_error_trailer's existing per-platform handling.
- optimize.main: annotate the standalone PdfContext(..., None, None) that
only ever reads context.options.
prek runs local hooks as plain execs against tools uv already provisions,
so ruff/mypy can never drift from the versions/config uv.lock pins
elsewhere and CI needs no separate hook-cache download.
- Add ruff and prek to the uv dev dependency group (ruff wasn't a
uv-managed dependency before; pre-commit silently vendored its own).
- Replace .pre-commit-config.yaml with prek.toml: keep the
pre-commit-hooks repo for generic file checks, convert ruff-format/
ruff-check to local `uv run ruff ...` hooks, and add a local mypy
hook that reports but never fails (87 pre-existing errors need a
separate cleanup before it can be made blocking).
- Add a `lint` job to CI that runs `prek run --all-files` and gate the
OS/Python test matrix on it so lint issues fail fast.
- Fix the ruff debt (format + lint) uncovered by actually running it,
since it was small and mechanical, so the new CI gate starts green.
James R. Barlow