feat(pos-pwa): pOS: make TPV installable PWA and launch fullscreen

work/artifacts/POS-PWA/documenter.md

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+# POS-PWA
+
+## Change
+POS app now has a PWA manifest (`/manifest.webmanifest`), enabling installability on Android/Chrome. iOS support via appleWebApp meta tags.

work/artifacts/POS-PWA/implementer.md

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+# Implementer — POS-PWA
+
+## Summary
+Added PWA manifest and viewport/theme_color to POS app.
+
+## Files
+- `app/manifest.ts`: PWA manifest with standalone display, theme_color #70AD47
+- `app/layout.tsx`: added viewport export with themeColor, appleWebApp config, manifest link
+
+## Note
+Removed `themeColor` from metadata export (unsupported by Next.js 16) — it now lives only in the `viewport` export.
+
+## Validation
+- `cd project/apps/pos && npm run build` ✅ (no warnings)
+- `/manifest.webmanifest` generated as static page
+- `git diff --check` ✅

work/artifacts/POS-PWA/leader-close.json

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+{
+  "feature_id": "POS-PWA",
+  "agent": "leader",
+  "stage": "close",
+  "verdict": "APPROVED",
+  "summary": "POS-PWA cerrada: manifest + viewport añadidos.",
+  "gates_summary": {
+    "reviewer": "APPROVED",
+    "security": "APPROVED",
+    "qa": "APPROVED"
+  },
+  "timestamp": "2026-08-26T18:36:35Z"
+}

work/artifacts/POS-PWA/qa.json

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+{
+  "feature_id": "POS-PWA",
+  "agent": "qa",
+  "stage": "qa_gate",
+  "verdict": "APPROVED",
+  "qa_check": "qa",
+  "summary": "Build clean. manifest.webmanifest visible in build output.",
+  "test_results": {
+    "automated": ["cd project/apps/pos && npm run build ✅", "git diff --check ✅"]
+  },
+  "timestamp": "2026-08-26T18:36:30Z"
+}

work/artifacts/POS-PWA/reviewer.json

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+{
+  "feature_id": "POS-PWA",
+  "agent": "reviewer",
+  "stage": "review_gate",
+  "verdict": "APPROVED",
+  "summary": "PWA manifest + viewport added to POS app. themeColor moved to viewport export per Next.js 16 requirements.",
+  "checks": [
+    { "item": "manifest.webmanifest generated", "ok": true },
+    { "item": "No build warnings", "ok": true }
+  ],
+  "issues": [],
+  "evidence": ["cd project/apps/pos && npm run build", "git diff --check"],
+  "timestamp": "2026-08-26T18:36:20Z"
+}

work/artifacts/POS-PWA/security.json

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+{
+  "feature_id": "POS-PWA",
+  "agent": "security",
+  "stage": "security_gate",
+  "verdict": "APPROVED",
+  "security_check": "security",
+  "summary": "Manifest and viewport metadata, no security implications.",
+  "timestamp": "2026-08-26T18:36:25Z"
+}