feat: implement code execution sandbox for programmatic tool calling

- Introduced a new `execute_code` tool that allows the agent to run Python scripts that call Hermes tools via RPC, reducing the number of round trips required for tool interactions.
- Added configuration options for timeout and maximum tool calls in the sandbox environment.
- Updated the toolset definitions to include the new code execution capabilities, ensuring integration across platforms.
- Implemented comprehensive tests for the code execution sandbox, covering various scenarios including tool call limits and error handling.
- Enhanced the CLI and documentation to reflect the new functionality, providing users with clear guidance on using the code execution tool.

cli.py

@@ -135,6 +135,10 @@ def load_cli_config() -> Dict[str, Any]:
         "clarify": {
             "timeout": 120,  # Seconds to wait for a clarify answer before auto-proceeding
         },
+        "code_execution": {
+            "timeout": 120,    # Max seconds a sandbox script can run before being killed
+            "max_tool_calls": 50,  # Max RPC tool calls per execution
+        },
     }
     
     # Track whether the config file explicitly set terminal config.