- T-658a: client-side trimming responsibility (cmhub rejects >8,
never trims); add release-gating note for the four-task unit
- T-658b: missing reference files are fail-fast only, drop the
skip-and-rewrite fork that violated T-637 snapshot semantics
- T-658d: mark as release gate for the a/b/c/d unit
Co-Authored-By: Claude Fable 5 <noreply@anthropic.com>