Advertise `elicitation.form` in the ACP handshake and handle `elicitation/create` requests end-to-end through the daemon. Adds `Elicitation` transcript row kind, `pending_elicitation` to ReducedState, the elicitation pump, persistence, and a new `POST /api/sessions/:id/structured/elicitations/:nonce` endpoint. Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>