refactor(download): remove ProviderCore/download.py, move sanitize_filename to SYS.utils, replace callers to use API.HTTP.HTTPClient

cmdlet/download_file.py

@@ -70,6 +70,7 @@ class Download_File(Cmdlet):
                    "download-http"],
             arg=[
                 SharedArgs.URL,
+                SharedArgs.PROVIDER,
                 SharedArgs.PATH,
                 SharedArgs.QUERY,
                 # Prefer -path for output directory to match other cmdlets; keep -output for backwards compatibility.
@@ -121,6 +122,7 @@ class Download_File(Cmdlet):
 
     def run(self, result: Any, args: Sequence[str], config: Dict[str, Any]) -> int:
         """Main execution method."""
+        debug(f"[download-file] run invoked with args: {list(args)}")
         return self._run_impl(result, args, config)
 
     @staticmethod
@@ -889,7 +891,7 @@ class Download_File(Cmdlet):
 
         return expanded_items
 
-    def _process_provider_items(
+    def _process_provider_items(self,
         *,
         piped_items: Sequence[Any],
         final_output_dir: Path,