Function humanize_tool_name 

pub fn humanize_tool_name(name: &str) -> String

Derives a human display name from a machine tool name.

Splits on _/-/whitespace, lowercases each token, then capitalizes the first letter of the first word: paid_fetch → "Paid fetch", delete-file → "Delete file", calculator → "Calculator". Input that is already spaced is normalized the same way ("delete file" → "Delete file"). An empty input yields an empty string.