Function display_tool_name_short 

pub fn display_tool_name_short(snake: &str) -> String

CC-style short tool name. Strips the redundant _file / _directory / _files suffixes (the noun is implicit from the arg) before PascalCase conversion. Generic — no per-tool match arms; works for any future tool that follows the <verb>_<noun> convention.

Examples:

• read_file → Read
• write_file → Write
• list_directory → List
• parallel_edit_files → ParallelEdit
• bash → Bash (no suffix to strip)
• search_replace → SearchReplace (suffix _replace not in strip list, kept verbatim → preserves disambiguation)