Function worktree_path 

pub fn worktree_path(
    xdg: &Xdg,
    plugin: &str,
    invocation_path: &str,
    id: &str,
) -> PathBuf

The derived code-worktree path (§11): the <id>/ child of this binding’s binding_territory. balls prints the same path from the same formula — no return channel. Pairs with work_branch — both derive from the same <id> key, so §11 claimant-keying (<key> = <id> or <id>-<claimant>) is a single edit across the pair, not a hunt for every work/<id> literal.