feat(sdk): establish the canonical local protocol contract #422

Job	Run time
macOS E2E (WKWebView)	2m 44s
Agent runtime suite	17s
Protocol suite	1m 21s
macOS build and protocol suite	1m 47s
Web app	1m 10s
Static checks	24s
npm launcher	14s
Linux E2E (Docker)	3m 5s
	11m 2s

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