Macro define_tool_error 

macro_rules! define_tool_error {
    ($name:ident) => { ... };
}

Macro to define a tool error type with standard From implementations.

This creates a newtype wrapper around String that implements:

• Debug, thiserror::Error
• From<anyhow::Error>
• From<std::io::Error>

Example

define_tool_error!(GitError);
// Creates: pub struct GitError(String);
// With Display showing: "GitError: {message}"