feat(pos-selfpay-flow): pOS selfpay: simplified pay flow with optional email receipt

work/runtime-status.json

@@ -2,11 +2,11 @@
   "feature_id": "CHECKOUT-STOCK-RECHECK",
   "stage": "build",
   "agent": "implementer",
-  "action": "Añadir manifest.ts, viewport export y theme_color a POS",
+  "action": "Implementar flujo selfpay: email opcional, métodos de pago",
   "state": "running",
   "next_agent": "reviewer",
   "waiting_for": "build",
-  "updated_at": "2026-08-26T18:37:28.928082Z",
+  "updated_at": "2026-08-26T18:39:17.268181Z",
   "timeline": [
     {
       "ts": "2026-08-26T17:21:37Z",
@@ -217,6 +217,20 @@
       "stage": "build",
       "state": "running",
       "message": "Añadir manifest.ts, viewport export y theme_color a POS"
+    },
+    {
+      "ts": "2026-08-26T18:39:17.268181Z",
+      "agent": "architect",
+      "stage": "design",
+      "state": "done",
+      "message": "Diseño: flujo selfpay simplificado"
+    },
+    {
+      "ts": "2026-08-26T18:39:17.268181Z",
+      "agent": "implementer",
+      "stage": "build",
+      "state": "running",
+      "message": "Implementar flujo selfpay simplificado"
     }
   ],
   "gates": {