feat: add agent-device acp, a deterministic stdio ACP agent #3982

Job	Run time
Layering Guard	14s
Packaged CLI Node 22.12	30s
Web Platform Smoke	39s
Fallow Code Quality	24s
Typecheck	17s
Lint & Format	21s
Coverage	2m 1s
Integration Tests	45s
iOS Runner Swift Compatibility	5s
No test-only DI seams	6s
Swift Runner Unit Compile	1m 13s
	6m 35s

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