[esp32_ble] Fix EventPool/LockFreeQueue sizing off-by-one (#14892)

esphome/components/esp32_ble/ble.cpp

@@ -575,8 +575,9 @@ template<typename... Args> void enqueue_ble_event(Args... args) {
   load_ble_event(event, args...);
 
   // Push the event to the queue
+  // Push always succeeds: pool is sized to queue capacity (N-1), so if
+  // allocate() returned non-null, the queue is guaranteed to have room.
   global_ble->ble_events_.push(event);
-  // Push always succeeds because we're the only producer and the pool ensures we never exceed queue size
 }
 
 // Explicit template instantiations for the friend function