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M3 milestone: write → Loop2 observe → failover → readback verify. Continuity runtime (continuity_runtime.go): - ExecuteReplicatedContinuity: composes mirror write + sync + Loop2 observation + failover + readback verify into one bounded path - ReplicatedContinuityResult: captures pre-failover Loop2 snapshot, failover result, selected primary, readback length, data match Runtime manager extensions: - Local node registry for write/readback during continuity verification - RegisterNode now stores node reference for local I/O access Tests prove two paths: - Happy: write on source → failover → promoted node reads correct data - Gated: degraded peer → failover gate stops → continuity reports failure Phase 18 docs: M3 delivered, M4 next. Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>