feat(sessions): add engine-isolated private contexts #372

Job	Run time
Static checks	29s
Agent runtime suite	12s
npm launcher	14s
macOS build and protocol suite	2m 13s
Linux E2E (Docker)	3m 11s
Protocol suite	1m 14s
Web app	32s
macOS E2E (WKWebView)	-1s
	8m 4s

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