feat: optional idempotency (ADR-0022) and per-URN schema validation (ADR-0024) #29

Job	Run time
Conformance suite in sync	6s
Static analysis (ruff + mypy)	41s
Python 3.13	23s
Python 3.9	27s
Python 3.12	23s
Python 3.10	21s
Broker integration (Redis · RabbitMQ · SQS)	1m 15s
Python 3.11	22s
CI green	3s
Conformance suite in sync	5s
Python 3.13	23s
Python 3.9	27s
Python 3.11	22s
Static analysis (ruff + mypy)	41s
Broker integration (Redis · RabbitMQ · SQS)	1m 15s
Python 3.12	23s
Python 3.10	21s
CI green	3s
	8m 1s

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