Eliminar payment + waiting (legacy): el bot toma pedidos, no cobra

El bot conversacional no maneja pagos. Su trabajo: pedidos, datos de
entrega, dejar la orden anotada en Woo (status=pending). El cobro lo
gestiona el comercio offline. Todo lo de payment_type / is_paid /
PAYMENT / WAITING_WEBHOOKS era legacy de un flow viejo que se baja.

Nuevo flow: IDLE → CART → SHIPPING → IDLE (con orden creada).
Cuando el usuario completa shipping (pickup elegido OR delivery+address),
shipping.js emite create_order y el bot cierra con order.confirmed.

- fsm.js: 4 estados (IDLE/CART/SHIPPING/AWAITING_HUMAN). hasPaymentInfo
  e isPaid eliminados. deriveNextState gira SHIPPING→IDLE en vez de
  →PAYMENT→WAITING. ALLOWED transitions actualizadas.
- orderModel.js: createEmptyOrder() sin payment_type/is_paid.
  migrateOldContext deja de leer payment_method / mp.payment_status.
- stateHandlers: payment.js y waiting.js eliminados. shipping.js gana
  finalizeOrder() que emite create_order action y vuelve a IDLE.
- replyTemplates: payment.* y waiting.* fuera. order.confirmed nuevo,
  con 3 variantes y rewriter habilitado.
- NLU openai.js + nlu/schemas.js: select_payment fuera del enum, payment_method
  fuera de entities. Prompt sin la regla de SELECCIONAR PAGO.
- nlu/router.js + nlu/index.js: dominio "payment" eliminado.
  shouldSkipRouter ya no chequea PAYMENT.
- nlu/specialists/payment.js: eliminado.
- promptsRepo.js + promptLoader.js: PROMPT_KEYS sin "payment".
- turnEngineV3.js: switch ya no dispatcha a PAYMENT/WAITING. normalizeState
  mapea estados legacy (PAYMENT/WAITING_WEBHOOKS/COMPLETED) a IDLE.
  context_patch ya no emite payment_method.
- wooOrders.createOrder: paymentMethod param eliminado. Order queda en
  status=pending sin payment_method (cobro offline).
- pipeline.js: paymentMethod fuera del create_order glue. Invariant
  "no_checkout_without_payment_link" eliminado. signal payment_selected
  reemplazado por shipping_completed.
- XState machine: top-level PAYMENT y WAITING eliminados. SELECT_PAYMENT
  event fuera. SHIPPING ahora cierra con enqueueWooCreateOrder +
  replyOrderConfirmed → IDLE. Guards hasPayment/isPaid borrados.
- Tests fsm.test.js / orderModel.test.js / machine/index.test.js
  actualizados al nuevo contrato. 188 tests pasando.

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

src/modules/3-turn-engine/turnEngineV3.js

@@ -1,7 +1,7 @@
 /**
  * Turn Engine V3 - Dispatcher basado en estados
  * 
- * Flujo: IDLE → CART → SHIPPING → PAYMENT → WAITING_WEBHOOKS
+ * Flujo: IDLE → CART → SHIPPING → IDLE (orden creada offline)
  * Regla universal: add_to_cart SIEMPRE vuelve a CART desde cualquier estado.
  * 
  * Feature flag USE_MODULAR_NLU=true para usar el nuevo sistema NLU modular.
@@ -15,8 +15,6 @@ import {
   handleIdleState,
   handleCartState,
   handleShippingState,
-  handlePaymentState,
-  handleWaitingState,
 } from "./stateHandlers.js";
 import { getStoreConfig } from "../0-ui/db/settingsRepo.js";
 import { pushRecent } from "./replyTemplates.js";
@@ -200,14 +198,6 @@ export async function runTurnV3({
       result = await handleShippingState(handlerParams);
       break;
       
-    case ConversationState.PAYMENT:
-      result = await handlePaymentState(handlerParams);
-      break;
-      
-    case ConversationState.WAITING_WEBHOOKS:
-      result = await handleWaitingState(handlerParams);
-      break;
-      
     default:
       // Estado desconocido, tratar como IDLE
       result = await handleIdleState(handlerParams);
@@ -242,21 +232,17 @@ function normalizeState(state) {
   if (s === "IDLE") return ConversationState.IDLE;
   if (s === "CART") return ConversationState.CART;
   if (s === "SHIPPING") return ConversationState.SHIPPING;
-  if (s === "PAYMENT") return ConversationState.PAYMENT;
-  if (s === "WAITING_WEBHOOKS") return ConversationState.WAITING_WEBHOOKS;
-  
-  // Estados viejos → CART
+
+  // Estados viejos / payment-flow legacy → mapeos seguros
   if (["CART_ACTIVE", "BROWSING", "CLARIFYING_ITEMS", "AWAITING_QUANTITY"].includes(s)) {
     return ConversationState.CART;
   }
-  
-  // Estados de checkout viejos
-  if (s === "CLARIFYING_PAYMENT") return ConversationState.PAYMENT;
-  if (s === "CLARIFYING_SHIPPING") return ConversationState.SHIPPING;
-  if (s === "AWAITING_ADDRESS") return ConversationState.SHIPPING;
-  if (s === "AWAITING_PAYMENT") return ConversationState.WAITING_WEBHOOKS;
-  if (s === "COMPLETED") return ConversationState.IDLE; // Nuevo ciclo
-  
+  if (s === "CLARIFYING_SHIPPING" || s === "AWAITING_ADDRESS") return ConversationState.SHIPPING;
+  // Estados que ya no existen (payment / waiting / completed) vuelven a IDLE
+  if (["PAYMENT", "WAITING_WEBHOOKS", "CLARIFYING_PAYMENT", "AWAITING_PAYMENT", "COMPLETED"].includes(s)) {
+    return ConversationState.IDLE;
+  }
+
   return ConversationState.IDLE;
 }
 
@@ -311,8 +297,7 @@ function formatResult(result, prevContext, recentReplies = [], failedSearches =
       unit: p.unit,
       status: p.status?.toLowerCase() || "needs_type",
     })),
-    payment_method: order.payment_type,
-    shipping_method: order.is_delivery === true ? "delivery" : 
+    shipping_method: order.is_delivery === true ? "delivery" :
                      order.is_delivery === false ? "pickup" : null,
     delivery_address: order.shipping_address ? { text: order.shipping_address } : null,
     woo_order_id: order.woo_order_id,