docs(proposals): ProposalManager v1.5 design — session cache, finalize, expires_at, capability validation, recipe lifecycle #1197

Job	Run time
AdCP storyboard runner — v3 reference seller (translator)	1m 21s
Validate conventional commit format	10s
AdCP storyboard runner — examples/seller_agent.py	1m 23s
Postgres conformance tests (Postgres 16)	1m 4s
Downstream import smoke (representative consumer symbols)	27s
v3 reference seller — pytest (respx-mocked upstream)	46s
Validate schemas are up-to-date	3m 36s
Test Python 3.13	3m 20s
AdCP storyboard runner — examples/multi_platform_seller (PlatformRouter)	1m 21s
Test Python 3.11	3m 26s
Test Python 3.10	3m 34s
Test Python 3.12	3m 23s
	23m 51s

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