feat(a2a): add public_url param to agent card for production deployments #1340

Job	Run time
Validate schemas are up-to-date	3m 46s
v3 reference seller — pytest (respx-mocked upstream)	44s
AdCP storyboard runner — v3 reference seller (translator)	1m 21s
AdCP storyboard runner — examples/multi_platform_seller (PlatformRouter)	1m 25s
Validate conventional commit format	9s
AdCP storyboard runner — examples/seller_agent.py	1m 27s
Postgres conformance tests (Postgres 16)	1m 2s
Downstream import smoke (representative consumer symbols)	26s
AdCP storyboard runner — sales-proposal-mode (proposal_finalize)	1m 5s
Test Python 3.10	3m 44s
Test Python 3.13	3m 31s
Test Python 3.12	3m 33s
Test Python 3.11	3m 36s
	25m 49s

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