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pingqiuandClaude Opus 4.6
59b2e2d8f9
Wire V2 promotion into the real master failover decision path: promoteReplica() now dispatches to promoteReplicaV2() when blockV2Promotion flag is true. V2 path queries each candidate for fresh evidence via pluggable BlockPromotionEvidenceQuerier, selects by CommittedLSN (durability-first), and fail-closes when no eligible candidate exists. No silent fallback to V1. Feature flag: blockV2Promotion bool on MasterServer. When false, existing promoteReplicaV1() (health-score-first) is used unchanged. Flag is explicit and observable, not a hidden rescue path. Registry: add PromoteReplicaByServer() for V2 path where master already knows the winner. Clear stale EngineProjectionMode in applyPromotionLocked (complements T1 turnover fix). T2 fix: fail-closed when V2 core projection is absent — Eligible=false with reason "missing_engine_projection". CommittedLSN from core used unconditionally (no WALHeadLSN overstatement). 5 T3 integration tests: higher CommittedLSN wins, all-ineligible fail-closed, evidence-failure fail-closed, flag-off uses legacy, epoch bump + assignment enqueue only after selection. Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>