Resolve stale BUG-AUTO merge noise

Complete proven recipe to RESOLVE stale BUG-AUTO ASK CDP FOCUS-STEAL timeout noise suggests (especially MERGEx2 survivors) that refuse to resolve. Documents all 5 resolve guards and exactly how to pass each. Until the suggest --dismiss-stale feature lands this is the only path to clear merged noise. Proven end-to-end during gg triage 2026-05-26.

Steps