fix: resolve type checking errors in code_command.py

[ezyang]

Stack from ghstack (oldest at bottom):

• chore: typecheck git_message.py #215
• chore: initialize project for configuration file typecheck #214
• fix: typecheck common.py and fix type errors #213
• -> fix: resolve type checking errors in code_command.py #212
• fix: typecheck and fix errors #211
• fix: typecheck and fix errors in glob.py #210
• fix: typecheck line_endings.py and create editorconfig stub #209

Let's continue fixing the typecheck errors in the codemcp project. We've already made progress on shell.py, async_file_utils.py, file_utils.py, and git_query.py. Now we should focus on fixing the remaining issues in code_command.py, git_message.py, and hot_reload_entry.py. Let's start with code_command.py which has issues with return type annotations and handling of string/bytes types.

5af23b5  (Base revision)
1d3d1a5  Remove unused Union import
3439a2e  Add type ignore comments to handle unknown types in return statements
dee99a9  Add type arguments for dict in append_metadata_to_message
8f2e147  Add more type imports needed for annotations
ed75b38  Add type arguments for Task and Queue
197bfef  Add type arguments for Queue in _run_manager_task
9f98a5f  Add type annotation for kwargs parameter in call_tool
414dbeb  Add type annotation for kwargs parameter in codemcp function
49f74b5  Add a default case to the match statement for exhaustive handling
4c483d6  Remove unused imports and add Future import
ecc9c67  Add type annotation for stop_future
c051d46  Add type annotation for response_future and handle None check for _request_queue
HEAD     Auto-commit format changes

codemcp-id: 221-fix-resolve-type-checking-errors-in-code-command-p