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/tests/test_event_subscribers.py

@@ -0,0 +1,69 @@
+"""Tests for event subscribers."""
+
+import pytest
+import asyncio
+from unittest.mock import Mock, AsyncMock
+
+from blockchain_event_bridge.event_subscribers.blocks import BlockEventSubscriber
+from blockchain_event_bridge.event_subscribers.transactions import TransactionEventSubscriber
+
+
+@pytest.mark.asyncio
+async def test_block_subscriber_initialization():
+    """Test block subscriber initialization."""
+    from blockchain_event_bridge.config import Settings
+
+    settings = Settings()
+    subscriber = BlockEventSubscriber(settings)
+
+    assert subscriber.settings == settings
+    assert subscriber._running is False
+
+
+@pytest.mark.asyncio
+async def test_block_subscriber_set_bridge():
+    """Test setting bridge on block subscriber."""
+    from blockchain_event_bridge.config import Settings
+    from blockchain_event_bridge.bridge import BlockchainEventBridge
+
+    settings = Settings()
+    subscriber = BlockEventSubscriber(settings)
+    bridge = Mock(spec=BlockchainEventBridge)
+
+    subscriber.set_bridge(bridge)
+    assert subscriber._bridge == bridge
+
+
+@pytest.mark.asyncio
+async def test_block_subscriber_stop():
+    """Test stopping block subscriber."""
+    from blockchain_event_bridge.config import Settings
+
+    settings = Settings()
+    subscriber = BlockEventSubscriber(settings)
+
+    # Start and immediately stop
+    task = asyncio.create_task(subscriber.run())
+    await asyncio.sleep(0.1)  # Let it start
+    await subscriber.stop()
+
+    # Cancel the task
+    task.cancel()
+    try:
+        await task
+    except asyncio.CancelledError:
+        pass
+
+    assert subscriber._running is False
+
+
+@pytest.mark.asyncio
+async def test_transaction_subscriber_initialization():
+    """Test transaction subscriber initialization."""
+    from blockchain_event_bridge.config import Settings
+
+    settings = Settings()
+    subscriber = TransactionEventSubscriber(settings)
+
+    assert subscriber.settings == settings
+    assert subscriber._running is False