cleanup and rename provider to plugin

cmdlet/__init__.py

@@ -88,7 +88,7 @@ def _load_root_modules() -> None:
 
 def _load_helper_modules() -> None:
     # Provider-specific module pre-loading removed; providers are loaded lazily
-    # through ProviderCore.registry when first referenced.
+    # through PluginCore.registry when first referenced.
     #
     # Keep explicit imports for cmdlets moved into subpackages so they remain
     # registered under their legacy command names.
@@ -118,7 +118,7 @@ def _register_native_commands() -> None:
 
 def _register_plugin_commands() -> None:
     try:
-        from ProviderCore.commands import register_plugin_commands
+        from PluginCore.commands import register_plugin_commands
     except Exception:
         return
     try: