feat(sessions): add engine-isolated private contexts #365

Job	Run time
Protocol suite	1m 17s
npm launcher	18s
Static checks	17s
Linux E2E (Docker)	1m 58s
Agent runtime suite	16s
macOS build and protocol suite	2m 46s
Web app	34s
macOS E2E (WKWebView)	0s
	7m 26s

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