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

work/artifacts/POS-SELFPAY-FLOW/documenter.md

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+# POS-SELFPAY-FLOW
+
+## Change
+Selfpay terminal mode now shows a simplified flow: tap Pagar → optional email for receipt → payment methods.

work/artifacts/POS-SELFPAY-FLOW/implementer.md

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+# Implementer — POS-SELFPAY-FLOW
+
+## Summary
+Simplified selfpay flow: tap Pagar → optional email modal → payment methods → sale.
+
+## Changes
+
+### States added
+- `showSelfpayEmail` — controls the email modal visibility
+- `selfpayEmail` — stores the optional email for the receipt
+
+### Selfpay button
+- In selfpay mode, "Cobrar e imprimir" is replaced by "💳 Pagar"
+- Tapping "Pagar" shows the email modal
+- The button is always enabled in selfpay mode (no payment requirement to start)
+
+### Payment methods
+- In selfpay mode, payment methods are hidden until after the email modal is shown
+- After email (or skip), payment methods appear and normal flow continues
+
+### Email modal
+- Optional email input for receipt
+- "Continuar al pago" submits and closes the modal
+- "Omitir" closes without email
+
+## Files
+- `app/(terminal)/page.tsx`
+
+## Validation
+- `cd project/apps/pos && npm run build` ✅
+- `git diff --check` ✅

work/artifacts/POS-SELFPAY-FLOW/leader-close.json

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+{
+  "feature_id": "POS-SELFPAY-FLOW",
+  "agent": "leader",
+  "stage": "close",
+  "verdict": "APPROVED",
+  "summary": "POS-SELFPAY-FLOW cerrada: flujo selfpay simplificado implementado.",
+  "gates_summary": {
+    "reviewer": "APPROVED",
+    "security": "APPROVED",
+    "qa": "APPROVED"
+  },
+  "timestamp": "2026-08-26T18:38:15Z"
+}

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

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+{
+  "feature_id": "POS-SELFPAY-FLOW",
+  "agent": "qa",
+  "stage": "qa_gate",
+  "verdict": "APPROVED",
+  "qa_check": "qa",
+  "summary": "Build clean.",
+  "test_results": {
+    "automated": ["cd project/apps/pos && npm run build ✅", "git diff --check ✅"]
+  },
+  "timestamp": "2026-08-26T18:38:10Z"
+}

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

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+{
+  "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"
+}

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

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+{
+  "feature_id": "POS-SELFPAY-FLOW",
+  "agent": "security",
+  "stage": "security_gate",
+  "verdict": "APPROVED",
+  "security_check": "security",
+  "summary": "Email input is optional and only used for sending receipt. No persistence.",
+  "checks": {
+    "input": "OK: email is optional, validated by browser email input.",
+    "storage": "OK: email is not persisted in localStorage or cookies."
+  },
+  "timestamp": "2026-08-26T18:38:05Z"
+}