feat(decisioning): ProposalManager v1.5 — primitives, capability validation, lifecycle helpers (#538-impl) #1230

Job	Run time
Test Python 3.11	3m 32s
Postgres conformance tests (Postgres 16)	1m 6s
v3 reference seller — pytest (respx-mocked upstream)	44s
Validate schemas are up-to-date	3m 47s
Test Python 3.13	3m 32s
AdCP storyboard runner — sales-proposal-mode (proposal_finalize)	1m 8s
AdCP storyboard runner — examples/multi_platform_seller (PlatformRouter)	1m 30s
Validate conventional commit format	9s
Test Python 3.12	3m 9s
AdCP storyboard runner — v3 reference seller (translator)	1m 23s
AdCP storyboard runner — examples/seller_agent.py	1m 14s
Downstream import smoke (representative consumer symbols)	29s
Test Python 3.10	3m 28s
	25m 11s

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