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b31383e294
Add master-driven lifecycle operations: promotion, demotion, rebuild, and split-brain prevention. All testable on Windows with mock TCP. New files: - promotion.go: HandleAssignment (single entry point for role changes), promote (Replica/None -> Primary with durable epoch), demote (Primary -> Draining -> Stale with drain timeout) - rebuild.go: RebuildServer (WAL catch-up + full extent streaming), StartRebuild client (WAL catch-up with full extent fallback, two-phase rebuild with second catch-up for concurrent writes) Modified: - wal_writer.go: ScanFrom() method, ErrWALRecycled sentinel - repl_proto.go: rebuild message types + RebuildRequest encode/decode - blockvol.go: assignMu, drainTimeout, rebuildServer fields; HandleAssignment/StartRebuildServer/StopRebuildServer methods; rebuild server stop in Close() - dirty_map.go: Clear() method for full extent rebuild 32 new tests covering WAL scan, promotion/demotion, rebuild server, rebuild client, split-brain prevention, and full lifecycle scenarios. Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>