chore(story-2.4): apply ruff format + ty: ignore on intentional bad arg

CI ruff format check flagged 4 files where the implementer subagents
ran ruff check but not ruff format. Apply the formatter.

ty also caught test_one_arg_callable_raises_typeerror — passing a
1-arg lambda is the whole point of the test, so the existing noqa
gets paired with ty: ignore[invalid-argument-type].

Also commits the Story 2-4 plan + the spec tweak that clarified the
__all__ ordering rule (the previous wording compared 'A' < 'A' which
was incoherent).

Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>

Author: lesnik512