fix: remove manual 0x2902/CCCD descriptor creation - NimBLE auto-creates it for NOTIFY characteristics; asserts on manual create

src/ble_midi_transport.cpp

@@ -81,10 +81,8 @@ bool BleMidiTransport::begin() {
         Serial.println("[BLE] FAILED to create characteristic");
         return false;
     }
-    Serial.println("[BLE] Creating descriptor...");
-    Serial.flush();
-    ble_char->createDescriptor(BLEUUID((uint16_t)0x2902), NIMBLE_PROPERTY::READ | NIMBLE_PROPERTY::WRITE);
-    Serial.println("[BLE] Descriptor created");
+    // 0x2902 (CCCD) is auto-created by NimBLE stack when characteristic
+    // has NOTIFY or INDICATE property - do NOT manually create it.
     Serial.println("[BLE] Setting callbacks...");
     ble_char->setCallbacks(new CharCallbacks());
     Serial.println("[BLE] Callbacks set");