Function get_worktree_root 

pub fn get_worktree_root() -> Result<Option<PathBuf>>

Get the worktree root for the current directory.

If the current directory is inside a linked worktree (not the main repo), returns the root path of that worktree. Returns None if in the main repo.

Returns

• Ok(Some(path)) - The worktree root if in a linked worktree
• Ok(None) - If in the main repository (not a linked worktree)
• Err - If not in a git repository