Checks (T12): make check

Row T12 of testing-plan.md § Evidence plan. Run at the PR's head on 2026-09-19 from the repository root.

$ make check
uv run ruff check cli hooks
All checks passed!
npx --yes markdownlint-cli2@0.18.1 "**/*.md"
Linting: 1243 file(s)
Summary: 0 error(s)
uv run ruff format --check cli hooks
330 files already formatted
uv run pyright cli
0 errors, 0 warnings, 0 informations
(validate: the schema copies, the manifest, the graph)
uv run python -m pytest -q
4127 passed, 1 skipped in 158.82s (0:02:38)

The one skipped test is the suite's standing skip, unrelated to this change. After the self-review rounds the whole suite is 4149 passed, 1 skipped (uv run python -m pytest -q from cli/, 2026-09-19); the round-2 fix commit's message says 4145, which is off by one.