New tests: scope/context, multi-signal, reactive DOM, VM HO forms. Fix rest primitive to not error-log on nil input (defensive). 1 remaining pre-existing failure: named-let set! scoping in JS bootstrapper — not related to WASM/hydration changes. 32/32 WASM, 1593/1594 JS full. Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>