feat(testing): make_request_context + build_asgi_app helpers (#535) #1177

Job	Run time
Downstream import smoke (representative consumer symbols)	32s
Validate schemas are up-to-date	3m 33s
AdCP storyboard runner — v3 reference seller (translator)	1m 17s
AdCP storyboard runner — examples/seller_agent.py	1m 12s
v3 reference seller — pytest (respx-mocked upstream)	42s
Postgres conformance tests (Postgres 16)	1m 3s
AdCP storyboard runner — examples/multi_platform_seller (PlatformRouter)	1m 27s
Test Python 3.11	2m 59s
Test Python 3.12	3m 27s
Test Python 3.10	3m 30s
Test Python 3.13	3m 24s
Validate conventional commit format	-1s
	23m 5s

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