feat(creative)!: make canonical models primary in v7 #2119

Job	Run time
Downstream import smoke (representative consumer symbols)	41s
Validate conventional commit format	15s
AdCP storyboard runner — sales-proposal-mode (proposal_finalize)	1m 35s
Postgres conformance tests (Postgres 16)	1m 35s
AdCP storyboard runner — examples/multi_platform_seller (PlatformRouter)	1m 59s
AdCP storyboard runner — examples/seller_agent.py (@adcp/sdk adcp-3.0)	1m 32s
Validate schemas are up-to-date	6m 11s
AdCP storyboard runner — examples/seller_agent.py (@adcp/sdk latest)	1m 49s
Test Python 3.12	6m 17s
v3 reference seller — pytest (respx-mocked upstream)	49s
AdCP storyboard runner — v3 reference seller (translator)	2m 39s
Test Python 3.11	4m 56s
Test Python 3.10	6m 16s
Test Python 3.13	5m 57s
AdCP storyboard runner — examples/seller_agent.py	4s
	42m 35s

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