cleanup and rename provider to plugin

cmdlet/file/add.py

@@ -63,7 +63,7 @@ class _CommandDependencies:
 
     def get_plugin(self, name: str) -> Optional[Any]:
         """Cached plugin lookup by name."""
-        from ProviderCore.registry import get_plugin
+        from PluginCore.registry import get_plugin
 
         norm_name = str(name or "").strip().lower()
         if not norm_name:
@@ -77,7 +77,7 @@ class _CommandDependencies:
 
     def get_plugin_with_capability(self, name: str, capability: str) -> Optional[Any]:
         """Cached plugin lookup with capability check."""
-        from ProviderCore.registry import get_plugin_with_capability
+        from PluginCore.registry import get_plugin_with_capability
 
         norm_name = str(name or "").strip().lower()
         if not norm_name:
@@ -2336,7 +2336,7 @@ class Add_File(Cmdlet):
         delete_after: bool,
     ) -> int:
         """Handle uploading via an upload plugin (e.g. 0x0)."""
-        from ProviderCore.registry import (
+        from PluginCore.registry import (
             get_plugin_with_capability,
             list_plugin_names_with_capability,
             list_plugins_with_capability,