feat: add Value.Equal bail-out check before reconciliation

Add TypeBox Value.Equal deep-comparison as first optimization layer
in reconcileProps. When a fiber's cached node is deep-equal to the
next node, skip prepareUpdate, commitUpdate, and children
reconciliation entirely. New cachedNode field on Fiber stores the
last reconciled node for comparison.

test/commit-mutations.test.ts

@@ -210,6 +210,7 @@ describe("commitMutations direct", () => {
       effect: null,
       signalDisposers: [],
       prevProps: null,
+      cachedNode: null,
     };
   }