feat: remove old prompt_chat_limit

chatgpt_config.yaml

@@ -18,16 +18,12 @@ interactive_file_selection: false
 partial_acceptance: false
 
 enable_debug_commands: true
-prompt_char_limit: 300000
 enable_chunking: false
 enable_step_by_step: true
 auto_lint: true
 
-# New tool auto-accept config
 tool_auto_accept:
   read_file: true
   edit_file: true
   replace_in_file: true
   execute_command: false
-  # If you set any of these to true, it will auto accept them without prompting.
-  # 'executeCommand' should remain false by default unless you're certain it's safe.