docs(proposals): product architecture — layered model + two-platform … #1115

Job	Run time
AdCP storyboard runner — examples/seller_agent.py	1m 20s
AdCP storyboard runner — v3 reference seller (translator)	1m 17s
Downstream import smoke (representative consumer symbols)	31s
AdCP storyboard runner — examples/multi_platform_seller (PlatformRouter)	1m 27s
Postgres conformance tests (Postgres 16)	1m 5s
Validate schemas are up-to-date	1m 31s
v3 reference seller — pytest (respx-mocked upstream)	41s
Test Python 3.10	1m 30s
Test Python 3.11	1m 31s
Test Python 3.12	1m 24s
Test Python 3.13	1m 31s
Validate conventional commit format	-1s
	13m 47s

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