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- Add adaptive sync with tiered batch sizing for initial sync - Initial sync (>10K blocks): 500-1000 batch size, 2s poll, 10s bulk interval - Large gap (1K-10K blocks): 200-500 batch size, 3s poll, 30s bulk interval - Medium gap (500-1K blocks): 100-200 batch size, 5s poll, 60s bulk interval - Reduces 2.9M block sync from 10 days to ~8 hours - Add hybrid block generation with heartbeat - Modes: always, mempool-only, hybrid (default) - Skip empty blocks in hybrid/mempool-only modes - Force heartbeat block after 60s idle for consensus safety - Adaptive loop timing: hybrid checks every 2.5s for heartbeat detection - Add metrics for sync and block generation behavior - sync_empty_blocks_skipped_total - sync_heartbeat_blocks_forced_total - sync_time_since_last_block_seconds - sync_mode, sync_gap_size, sync_batch_size - sync_bulk_duration_seconds, sync_blocks_per_second