- Fix network command: use .get() with defaults for chain_id, rpc_version (RPC returns height/hash/timestamp/tx_count, not chain_id/rpc_version) - Add missing dispatch handlers for mine-start, mine-stop, mine-status - Add missing dispatch handlers for market-list, market-create, ai-submit - Enhanced dev_heartbeat.py with AITBC blockchain health checks (monitors local RPC, genesis RPC, height diff, service status)