SIENTIAPDE-1646

SIENTIAPDE-1646 Enhance OPC integration and E2E testing framework

- Updated .gitignore to exclude '.cursor/*' for better file management.
- Added new marker in pyproject.toml for E2E tests using OPC.
- Introduced async OPC server fixtures and improved connection handling in conftest.py.
- Enhanced error handling in OPC activities and added metrics for session management in metrics.py.
- Updated E2E tests to cover new OPC scenarios, including session errors and reconnect handling.
- Refactored helper functions to improve prediction assertion logic in helpers.py.
- Documented new OPC scenarios in scenarios.md for clarity on expected outcomes.

pyproject.toml

@@ -121,6 +121,7 @@ markers = [
     "asyncio: marks tests as async",
     "integration: marks tests as integration tests",
     "unit: marks tests as unit tests",
+    "opc: marks E2E tests that use in-process asyncua + real OpcRepository",
 ]
 
 [tool.coverage.run]