feat(decisioning): ProposalManager v1.5 — primitives, capability validation, lifecycle helpers (#538-impl) #1223

Job	Run time
Validate schemas are up-to-date	3m 37s
Validate conventional commit format	7s
Downstream import smoke (representative consumer symbols)	31s
v3 reference seller — pytest (respx-mocked upstream)	43s
Postgres conformance tests (Postgres 16)	1m 3s
AdCP storyboard runner — sales-proposal-mode (proposal_finalize)	1m 5s
AdCP storyboard runner — examples/seller_agent.py	1m 29s
AdCP storyboard runner — v3 reference seller (translator)	1m 14s
Test Python 3.12	2m 56s
Test Python 3.11	3m 23s
AdCP storyboard runner — examples/multi_platform_seller (PlatformRouter)	1m 33s
Test Python 3.10	3m 35s
Test Python 3.13	3m 21s
	24m 37s

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