Add blockchain event bridge service with smart contract event integration

- Phase 1: Core bridge service with gossip broker subscription
- Phase 2: Smart contract event integration via eth_getLogs RPC endpoint
- Add contract event subscriber for AgentStaking, PerformanceVerifier, Marketplace, Bounty, CrossChainBridge
- Add contract event handlers in agent_daemon.py and marketplace.py
- Add systemd service file for blockchain-event-bridge
- Update blockchain node router.py with eth_getLogs endpoint
- Add configuration for contract addresses
- Add tests for contract subscriber and handlers (27 tests passing)

apps/blockchain-event-bridge/src/blockchain_event_bridge/polling/conditions.py

@@ -0,0 +1,50 @@
+"""Condition-based polling for batch operations."""
+
+import asyncio
+import logging
+from typing import Any, Dict
+
+logger = logging.getLogger(__name__)
+
+
+class ConditionPoller:
+    """Polls for specific conditions that should trigger OpenClaw actions."""
+
+    def __init__(self, settings: Any) -> None:
+        self.settings = settings
+        self._running = False
+
+    async def run(self) -> None:
+        """Run the condition poller."""
+        if not self.settings.enable_polling:
+            logger.info("Condition polling disabled")
+            return
+
+        self._running = True
+        logger.info("Starting condition poller...")
+
+        while self._running:
+            try:
+                await self._check_conditions()
+                await asyncio.sleep(self.settings.polling_interval_seconds)
+            except asyncio.CancelledError:
+                logger.info("Condition poller cancelled")
+                break
+            except Exception as e:
+                logger.error(f"Error in condition poller: {e}", exc_info=True)
+                await asyncio.sleep(5)
+
+    async def _check_conditions(self) -> None:
+        """Check for conditions that should trigger actions."""
+        # Placeholder for Phase 3 implementation
+        # Examples:
+        # - Agent performance thresholds (SLA violations)
+        # - Marketplace capacity planning
+        # - Governance proposal voting deadlines
+        # - Cross-chain bridge status
+        pass
+
+    async def stop(self) -> None:
+        """Stop the condition poller."""
+        self._running = False
+        logger.info("Condition poller stopped")