fix: use pointer to dispatcher state in process callback for real-time access

Co-authored-by: aider (deepseek/deepseek-coder) <aider@aider.chat>

dispatcher.h

@@ -210,6 +210,11 @@ void dispatcher_stop(void);
 // Get current state (thread-safe snapshot)
 void dispatcher_get_state(AppState *out);
 
+// Get pointer to dispatcher's state (for real-time threads that can't block)
+// WARNING: This is NOT thread-safe. Only use in JACK process callback
+// which is serialized per client.
+AppState* dispatcher_get_state_ptr(void);
+
 // ============================================================
 // Reducer - pure function
 // ============================================================