[script] Disable queued script polling while the queue is empty (#18121)

esphome/components/script/script.h

@@ -142,6 +142,9 @@ template<typename... Ts> class QueueingScript : public Script<Ts...>, public Com
       // Use std::make_unique to replace the unique_ptr
       this->var_queue_[write_pos] = std::make_unique<std::tuple<Ts...>>(x...);
       this->num_queued_++;
+      // Enable loop now that there is something to dequeue - don't call loop()
+      // synchronously! Let the event loop call it to avoid reentrancy issues
+      this->enable_loop();
       return;
     }
 
@@ -168,6 +171,15 @@ template<typename... Ts> class QueueingScript : public Script<Ts...>, public Com
       this->queue_front_ = (this->queue_front_ + 1) % queue_capacity;
       this->trigger_tuple_(*tuple_ptr, std::make_index_sequence<sizeof...(Ts)>{});
     }
+    if (this->num_queued_ == 0 && !this->is_idle()) {
+      // Queue is now empty - disable loop until the next execute() queues an
+      // instance. The inline is_idle() check skips the out-of-line call when
+      // the loop is already disabled (execute() calls loop() synchronously).
+      // This can run before this component's setup() (execute() from on_boot),
+      // which leaves the state machine in LOOP_DONE and skips call_setup();
+      // this class therefore must not rely on a setup() override.
+      this->disable_loop();
+    }
   }
 
   void set_max_runs(int max_runs) { max_runs_ = max_runs; }