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* Add restore validation feature with simplified backup gap fix Implements restore validation using audit_storage to verify backup/restore correctness. Includes a minimal fix for the backup gap bug. Key components: - ValidateRestore audit type: compares source keys against restored keys at \xff\x02/rlog/ prefix in storage server - DD audit fixes: propagate validation errors, handle DD failover correctly - RestoreValidation and BackupAndRestoreValidation workloads for testing - Simplified backup gap fix: prevent snapshot from finishing in the same iteration it dispatches the last tasks (single flag + one check)