fix: deploy.bat UAC directory bug and suppress ai-edge-litert AttributeError

Author: solderzzc

skills/detection/yolo-detection-2026-coral-tpu/deploy.bat

@@ -58,7 +58,7 @@ echo {"event": "progress", "stage": "platform", "message": "A UAC prompt will ap
 REM Run install.bat elevated and wait for it to complete.
 REM The '<nul' suppresses the clock-speed interactive prompt (uses the default: standard).
 powershell -NoProfile -Command ^
-  "Start-Process -FilePath 'cmd.exe' -ArgumentList '/c install.bat <nul' -Verb RunAs -Wait"
+  "Start-Process -FilePath 'cmd.exe' -ArgumentList '/c install.bat <nul' -WorkingDirectory '%TMP_DIR%\edgetpu_runtime' -Verb RunAs -Wait"
 
 if %errorlevel% neq 0 (
     echo.
@@ -212,5 +212,5 @@ if "!TPU_FOUND!"=="true" (
     exit /b 0
 ) else (
     echo {"event": "complete", "status": "partial", "tpu_found": false, "message": "Coral TPU skill installed. Plug in your Coral USB Accelerator to enable hardware acceleration."}
-    exit /b 2
+    exit /b 0
 )

skills/detection/yolo-detection-2026-coral-tpu/scripts/detect.py

@@ -232,6 +232,18 @@ def _load_model(self):
         # Try loading with Edge TPU delegate
         edgetpu_lib = _edgetpu_lib_name()
         try:
+            # Squelch __del__ AttributeError bugs in ai-edge-litert when delegate fails to load
+            if hasattr(litert, 'Delegate'):
+                original_del = getattr(litert.Delegate, '__del__', None)
+                if original_del and not hasattr(litert.Delegate, '_patched_del'):
+                    def safe_del(self):
+                        try:
+                            original_del(self)
+                        except AttributeError:
+                            pass
+                    litert.Delegate.__del__ = safe_del
+                    litert.Delegate._patched_del = True
+
             delegate = litert.load_delegate(edgetpu_lib)
             self.interpreter = litert.Interpreter(
                 model_path=model_path,