feat(sessions): add engine-isolated private contexts #363

Job	Run time
Linux E2E (Docker)	2m 4s
macOS build and protocol suite	1m 25s
Static checks	19s
Agent runtime suite	22s
Web app	30s
npm launcher	12s
Protocol suite	1m 14s
macOS E2E (WKWebView)	0s
	6m 6s

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