The headless batch hang the user reported was caused by an xdist worker
crash on test_headless_verification_full_run, not a test logic failure.
The same root cause as the 4 Phase 2 follow-ups (mock returns raw string
but production does 'if not result.ok:'), but with a different failure
mode (worker crash that hangs the batched test runner).
Documented in section 3 of the report as deviation #2.5 with:
- Where it went wrong (missed in the 4 follow-ups)
- The specific symptom in the user's session
- The fix (out-of-band commit e35b6a34)
- Lesson for the next spec (verification must include xdist mode)
ed
bc388f11bb