Function normalize_tool_path 

pub fn normalize_tool_path(path: &str) -> String

Normalize paths from any client format to a consistent OS-native form. Handles MSYS2/Git Bash drive prefixes on Windows hosts (/c/Users/... -> C:/Users/...), mixed separators, double slashes, and trailing slashes. Uses forward slashes for consistency. On non-Windows hosts /c/... is a literal directory and passes through unchanged (#397).