Function settle_by_uid 

pub(super) fn settle_by_uid(
    state: &AppState,
    req: &mut InjectionRequest,
    claimed: &str,
    shared_dir: &Path,
    now_secs: i64,
) -> bool

Settle a cross-channel jekt’s checks by its v2 signature, when it proves the sender is the agent this instance knows by the claimed name (or one it knows no agent by). true when settled, either way; false leaves the name’s checks to the caller.