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feat(enterprise): Add OTEL telemetry with slim traces, metrics, and structured logs
- Add EnterpriseOtelTrace handler with span emission for workflows and nodes - Implement minimal-span strategy: slim spans + detailed companion logs - Add deterministic span/trace IDs for cross-workflow trace correlation - Add metric collection at 100% accuracy (counters & histograms) - Add event handlers for app lifecycle and feedback telemetry - Add cross-workflow trace linking with parent context propagation - Add OTEL exporter with configurable sampling and privacy controls - Wire enterprise telemetry into workflow execution pipeline - Add telemetry configuration in enterprise configs
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