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- One call per pytest.raises block (S5778): build the guarded start() before the block and nest the patch outside it. - The NATS callbacks stay async on purpose: nats-py rejects callbacks that are not coroutine functions. Comment it and assert it in the callback test, so nobody drops the async keyword to please S7503. Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>