- Add resolved_parent_context property to BaseTraceInfo for reusable parent context extraction
- Refactor enterprise_trace.py to use property instead of duplicated dict plucking (~19 lines eliminated)
- Fix UUID validation in exporter.py with specific error logging for invalid trace correlation IDs
- Add error isolation in event_handlers.py to prevent telemetry failures from breaking user operations
- Replace pickle-based payload_fallback with JSON storage rehydration for security
- Update TelemetryEnvelope to use Pydantic v2 ConfigDict with extra='forbid'
- Update tests to reflect contract changes and new error handling behavior
