fix(decisioning): wire sync_accounts/list_accounts dispatch to AccountStore Protocols #1327

Job	Run time
AdCP storyboard runner — examples/seller_agent.py	1m 23s
Validate schemas are up-to-date	3m 43s
Validate conventional commit format	7s
Postgres conformance tests (Postgres 16)	1m 4s
v3 reference seller — pytest (respx-mocked upstream)	39s
AdCP storyboard runner — v3 reference seller (translator)	1m 26s
AdCP storyboard runner — sales-proposal-mode (proposal_finalize)	1m 8s
Downstream import smoke (representative consumer symbols)	31s
Test Python 3.10	3m 40s
Test Python 3.11	3m 34s
AdCP storyboard runner — examples/multi_platform_seller (PlatformRouter)	1m 25s
Test Python 3.12	3m 39s
Test Python 3.13	3m 27s
	25m 46s

Provide feedback