refactor: update identify_file method signature to return dict and remove tool decorator

src/file_processing_tool.py

@@ -1,8 +1,7 @@
 from __future__ import annotations
-from smolagents import tool
 import os
 import mimetypes
-from typing import Self # Added import
+from typing import Self
 
 import os
 import mimetypes
@@ -31,8 +30,7 @@ class FileIdentifier:
             for ext in details["extensions"]:
                 self.extension_to_type[ext] = simple_type
 
-    @tool
-    def identify_file(self: Self, filepath: str):
+    def identify_file(self: Self, filepath: str) -> dict: # Standard instance method signature
         """
         Identifies the file type and suggests a processing action.