docs(proposals): ProposalManager v1.5 design — session cache, finalize, expires_at, capability validation, recipe lifecycle #1178

Job	Run time
Downstream import smoke (representative consumer symbols)	26s
Validate schemas are up-to-date	3m 37s
Validate conventional commit format	9s
Postgres conformance tests (Postgres 16)	1m 8s
AdCP storyboard runner — examples/seller_agent.py	1m 25s
Test Python 3.12	3m 44s
Test Python 3.10	3m 48s
AdCP storyboard runner — examples/multi_platform_seller (PlatformRouter)	1m 18s
v3 reference seller — pytest (respx-mocked upstream)	41s
AdCP storyboard runner — v3 reference seller (translator)	1m 25s
Test Python 3.11	3m 35s
Test Python 3.13	3m 21s
	24m 37s

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