QTZPOC-20

QTZPOC-20: Enhance system robustness and test coverage across bundle processing, activity error handling, and worker operations.

*   Strengthen bundle reader validation with new tests for archive integrity, security vulnerabilities (e.g., path traversal, duplicate entries, special file types), and I/O error resilience.
*   Improve error handling and status propagation in PI Web API, MLflow, and OPC activities, including partial write scenarios and OPC session management.
*   Add comprehensive tests for worker startup, configuration, graceful shutdown, and Prometheus metrics server initialization.
*   Introduce a new utility for intelligent DataFrame debugging, summarizing large dataframes for concise logging, and refine exception chain summarization.
*   Update code coverage configuration to exclude @overload decorator lines.

pyproject.toml

@@ -179,6 +179,7 @@ exclude_lines = [
     "if TYPE_CHECKING:",
     "class .*\\bProtocol\\):",
     "@(abc\\.)?abstractmethod",
+    "@overload",
 ]
 
 [tool.coverage.html]