One-constant flip (L10_FAIL = True) per the sweep plan's Batch 0 revert
note ("WARN for one batch before becoming FAIL"). Harness rc
expectations updated for the five firing cases; 42/42 PASS. G3 cell
updated same commit: Batch 0 CLOSED, Batch 1 OPENED by operator.

Revert: git revert this commit (restores WARN severity).

Co-Authored-By: Claude Fable 5 <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_01VZbUeRE8weySLSGY1odrCi