ruff.toml excludes tests/* from `ruff check`, so nothing has ever checked the
test tree for names that do not exist. That matters more in tests than in
product code: a NameError inside a test whose body is wrapped in
`except Exception: pass` is swallowed, and the test reports green forever.
Adds ruff-tests.toml selecting F821 alone, wired into the lint workflow and
`make lint-ruff`, and clears every existing violation:
- 4 tests interpolated an unbound `e` into a `pytest.fail` message reached only
on the failure path, so the NameError, not the assertion, is what ran.
test_llm_guard_error_raising is the worst: it passes today with content
safety disabled entirely. It now asserts the 400 and its detail body.
- 5 sites construct BaseExceptionGroup, a 3.11 builtin, in a tree that still
supports 3.10. Guarded behind the exceptiongroup backport that anyio already
pulls in below 3.11.
- 9 missing imports (json, openai, Any, Final, HTTPException), including one in
a helper that catches HTTPException by a name it never imported, so the
challenge path it exists to detect raises NameError instead.
- 5 annotations naming types imported inside the function body, hoisted to
module scope or TYPE_CHECKING.
- 2 blocks of dead code: everything after a pytest.fail in
test_claude_agent_sdk, and an unused helper in test_end_users calling a
function defined in a different module.
- 1 error-path f-string in the router-settings doc test that masked the real
FileNotFoundError behind a NameError.
Only F821 for now. Widening the select list means ratcheting thousands of
pre-existing findings, so rules go in one at a time with their violations
already fixed.
