feat(transitions): tasks_ready predicate for execution loop

New TasksReady condition driven by EvaluationContext.readyTaskCount,
fed at resolve time via a kernel-declared ReadyTaskCounter interface
implemented in apps/server over TaskService (keeps core:kernel
decoupled from core:tasks). Loops a graph while ready>0, exits at 0.

frontend/src/components/session/SessionView.tsx

@@ -0,0 +1,8 @@
+import React from 'react';
+
+const SessionView: React.FC<{ api: any }> = ({ api }) => {
+  // Implementation in Step 3
+  return <div>Session View Component</div>;
+};
+
+export default SessionView;