feat(migrate): --auto-apply mode for mechanically-rewritable codemod findings #1190

Job	Run time
Postgres conformance tests (Postgres 16)	1m 4s
Validate conventional commit format	6s
v3 reference seller — pytest (respx-mocked upstream)	36s
Downstream import smoke (representative consumer symbols)	26s
Test Python 3.13	2m 53s
AdCP storyboard runner — examples/multi_platform_seller (PlatformRouter)	1m 26s
Test Python 3.11	3m 22s
Validate schemas are up-to-date	3m 40s
AdCP storyboard runner — examples/seller_agent.py	1m 13s
AdCP storyboard runner — v3 reference seller (translator)	1m 33s
Test Python 3.10	3m 44s
Test Python 3.12	3m 31s
	23m 34s

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