feat(POS-005): completed feature

work/artifacts/POS-005/implementer.md

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+# POS-005 — Implementer evidence
+
+## What
+POS-005 build: product search + payment methods CRUD endpoints. tsc 0, verify.sh verde.
+
+## Files
+- `src/modules/pos/api/pos.routes.ts` — new routes added: GET /pos/products/search, /pos/products/by-ean/:ean, /pos/products/by-sku/:sku, GET/POST/PATCH /pos/admin/payment-methods
+
+## Verification
+- `npm run build` → 0 TypeScript errors.
+- `check-module-boundaries.mjs src` → 0 NEW violations.
+- `./scripts/verify.sh` → green.
+
+## AC traceability
+| AC | Estado | Evidencia |
+|----|--------|-----------|
+| AC1 product search | ✅ | GET /pos/products/search with ILIKE + SKU + EAN lookup |
+| AC2 EAN lookup | ✅ | GET /pos/products/by-ean/:ean |
+| AC3 SKU lookup | ✅ | GET /pos/products/by-sku/:sku |
+| AC4 payment methods admin | ✅ | GET/POST/PATCH /pos/admin/payment-methods |
+| AC5 tsc/verify | ✅ | tsc 0, verify verde |