Roundtrip fidelity (float precision, 500-keyframe lists, extra keys ride along),
multiple coexisting paths + id-ordered listing, duplicate/unicode/whitespace names,
ISO created_at, 404s, and an 18-case 422 matrix over the frozen camPath contract.
Cleans up after itself so test_phase5_api still sees an empty table.
Co-Authored-By: Claude Fable 5 <noreply@anthropic.com>
