feat(otel): optional OpenTelemetry tracing (ADR-0025) #32

Job	Run time
Static analysis (ruff + mypy)	43s
Broker integration (Redis · RabbitMQ · SQS)	1m 17s
Conformance suite in sync	3s
Python 3.11	18s
Python 3.9	25s
Python 3.10	26s
Python 3.13	22s
Python 3.12	21s
CI green	3s
	3m 58s

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