chore: apply ruff semantics-preserving autofixes

[eduardstan]

Evidence

$ ruff check .
All checks passed!

$ ruff check . --select 'UP045,UP037,UP035,UP017,UP033,RUF022,C420,PIE790,PIE808,RET501'
All checks passed!

$ mypy
Success: no issues found in 2 source files

$ pytest --cov=reasonsmith --cov-report=term-missing --cov-fail-under=95
1633 passed, 36 skipped, 3 warnings in 548.57s (0:09:08)
TOTAL 10673 521 95.12%
Required test coverage of 95% reached. Total coverage: 95.12%

$ git diff --stat main...HEAD
43 files changed, 168 insertions(+), 164 deletions(-)

The complete pytest output includes the per-file term-missing table and the pytest-asyncio deprecation warning; the command exited 0. The diff was read hunk-by-hunk: it changes no string literal, no control flow, and no public signature. Optional annotations becoming PEP 604 unions are expected annotation-only changes; defaults and exception behavior are unchanged.

packages/** TypeScript is untouched. The two example files were authorized by firstmate: src/reasonsmith/examples/language_model_notices.py (UP035 Callable import) and src/reasonsmith/examples/recounted_reason_trace.py (RET501). The CI-ruleset cleanup produced no files outside the 43 already touched by the selected autofixes; git diff --name-only before and after was unchanged.

RUF100 was intentionally excluded because it would remove suppressions that remain load-bearing under other rule sets.