RuvNet Brain v4.2.2-dev

Emergency stabilization release. Fixes live-version retention during auto-update, immutable corpus-seed convergence, release receipt canonicalization, and the Node 20/Linux unit-suite hang. Exact candidate release QE, Linux integration, all-platform UX, warm-brain, and source/coverage gates passed. Windows release-seed fixture portability remains follow-up work; runtime Windows UX passed.