Resolve Assistant Turn Approval

Answer a paused turn's pending approvals: the answers land as durable rows, then the thread's ConversationWorkflow gets the contentless interrupt_answered wake and routes them — couriered to a live pause over the turn's unchanged signals, or consumed by the resume it opens for a parked turn (its wait expired), which continues the persisted conversation under the turn's pinned agent revision. An answer already past this door answers a receipt (already_consumed): the turn's own once a resume consumed it, or a coworker's once its row left paused with the decision recorded — however it left, or paused again at a newer round. Interrupt ids come from the thread's approval_requested events and are deliberately unvalidated here: an id the pause never raised satisfies nothing.