Add sys import to test files and remove obsolete integration tests

- Add sys import to 29 test files across agent-coordinator, blockchain-event-bridge, blockchain-node, and coordinator-api
- Remove apps/blockchain-event-bridge/tests/test_integration.py (obsolete bridge integration tests)
- Remove apps/coordinator-api/tests/test_integration.py (obsolete API integration tests)
- Implement GPU registration in marketplace_gpu.py with GPURegistry model persistence

apps/plugin-analytics/tests/test_unit_plugin_analytics.py

@@ -0,0 +1,123 @@
+"""Unit tests for plugin analytics service"""
+
+import pytest
+import sys
+import sys
+from pathlib import Path
+from datetime import datetime
+
+
+from main import app, PluginUsage, PluginPerformance, PluginRating, PluginEvent
+
+
+@pytest.mark.unit
+def test_app_initialization():
+    """Test that the FastAPI app initializes correctly"""
+    assert app is not None
+    assert app.title == "AITBC Plugin Analytics Service"
+    assert app.version == "1.0.0"
+
+
+@pytest.mark.unit
+def test_plugin_usage_model():
+    """Test PluginUsage model"""
+    usage = PluginUsage(
+        plugin_id="plugin_123",
+        user_id="user_123",
+        action="install",
+        timestamp=datetime.utcnow(),
+        metadata={"source": "marketplace"}
+    )
+    assert usage.plugin_id == "plugin_123"
+    assert usage.user_id == "user_123"
+    assert usage.action == "install"
+    assert usage.metadata == {"source": "marketplace"}
+
+
+@pytest.mark.unit
+def test_plugin_usage_defaults():
+    """Test PluginUsage with default metadata"""
+    usage = PluginUsage(
+        plugin_id="plugin_123",
+        user_id="user_123",
+        action="use",
+        timestamp=datetime.utcnow()
+    )
+    assert usage.metadata == {}
+
+
+@pytest.mark.unit
+def test_plugin_performance_model():
+    """Test PluginPerformance model"""
+    perf = PluginPerformance(
+        plugin_id="plugin_123",
+        version="1.0.0",
+        cpu_usage=50.5,
+        memory_usage=30.2,
+        response_time=0.123,
+        error_rate=0.001,
+        uptime=99.9,
+        timestamp=datetime.utcnow()
+    )
+    assert perf.plugin_id == "plugin_123"
+    assert perf.version == "1.0.0"
+    assert perf.cpu_usage == 50.5
+    assert perf.memory_usage == 30.2
+    assert perf.response_time == 0.123
+    assert perf.error_rate == 0.001
+    assert perf.uptime == 99.9
+
+
+@pytest.mark.unit
+def test_plugin_rating_model():
+    """Test PluginRating model"""
+    rating = PluginRating(
+        plugin_id="plugin_123",
+        user_id="user_123",
+        rating=5,
+        review="Great plugin!",
+        timestamp=datetime.utcnow()
+    )
+    assert rating.plugin_id == "plugin_123"
+    assert rating.rating == 5
+    assert rating.review == "Great plugin!"
+
+
+@pytest.mark.unit
+def test_plugin_rating_defaults():
+    """Test PluginRating with default review"""
+    rating = PluginRating(
+        plugin_id="plugin_123",
+        user_id="user_123",
+        rating=4,
+        timestamp=datetime.utcnow()
+    )
+    assert rating.review is None
+
+
+@pytest.mark.unit
+def test_plugin_event_model():
+    """Test PluginEvent model"""
+    event = PluginEvent(
+        event_type="error",
+        plugin_id="plugin_123",
+        user_id="user_123",
+        data={"error": "timeout"},
+        timestamp=datetime.utcnow()
+    )
+    assert event.event_type == "error"
+    assert event.plugin_id == "plugin_123"
+    assert event.user_id == "user_123"
+    assert event.data == {"error": "timeout"}
+
+
+@pytest.mark.unit
+def test_plugin_event_defaults():
+    """Test PluginEvent with default values"""
+    event = PluginEvent(
+        event_type="info",
+        plugin_id="plugin_123",
+        timestamp=datetime.utcnow()
+    )
+    assert event.user_id is None
+    assert event.data == {}