pub fn detect_project_root(file_path: &str) -> Option<String>Expand description
Finds the outermost project root by walking up from file_path.
For monorepos with nested .git dirs (e.g. mono/backend/.git + mono/frontend/.git),
returns the outermost ancestor containing .git, a workspace marker, or a known
monorepo config file — so the whole monorepo is treated as one project.