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

work/artifacts/POS-SELFPAY-FLOW/reviewer.json

@@ -0,0 +1,14 @@
+{
+  "feature_id": "POS-SELFPAY-FLOW",
+  "agent": "reviewer",
+  "stage": "review_gate",
+  "verdict": "APPROVED",
+  "summary": "Selfpay flow implemented: Pagar button → optional email modal → payment methods → sale.",
+  "checks": [
+    { "item": "Build POS without errors", "ok": true },
+    { "item": "Email modal renders in selfpay mode", "ok": true }
+  ],
+  "issues": [],
+  "evidence": ["cd project/apps/pos && npm run build", "git diff --check"],
+  "timestamp": "2026-08-26T18:38:00Z"
+}