chore: bump AdCP schemas to beta.5 #1844

Job	Run time
AdCP storyboard runner — examples/seller_agent.py (@adcp/sdk adcp-3.1)	2m 33s
Validate schemas are up-to-date	57s
Postgres conformance tests (Postgres 16)	1m 8s
AdCP storyboard runner — examples/seller_agent.py (@adcp/sdk adcp-3.0)	1m 52s
Test Python 3.10	4m 53s
Test Python 3.12	4m 26s
Test Python 3.11	4m 20s
Downstream import smoke (representative consumer symbols)	33s
AdCP storyboard runner — examples/multi_platform_seller (PlatformRouter)	1m 39s
Test Python 3.13	4m 45s
AdCP storyboard runner — sales-proposal-mode (proposal_finalize)	1m 17s
v3 reference seller — pytest (respx-mocked upstream)	38s
Validate conventional commit format	14s
AdCP storyboard runner — v3 reference seller (translator)	2m 30s
AdCP storyboard runner — examples/seller_agent.py	4s
	31m 49s

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