Two tiers per #665: Tier 1 = never passed anywhere (10 — capability gap), Tier 2 = reachable but rare (6 — probability gap; per-scenario evidence inline). RM-13 moved out of never-set on the vLLM A0 OFF pass, shrinking Sean's proposed 11 to 10. Same 16 selections, guard green. Co-Authored-By: Claude Fable 5 <noreply@anthropic.com> Claude-Session: https://claude.ai/code/session_01EfF565T9eSLaqGzidyJ1Pm