chore(checkpoint): save club core backend and pending pos fixes

work/artifacts/POS-RECEIPT-QUICK-FIXES/reviewer.json

@@ -0,0 +1,33 @@
+{
+  "feature_id": "POS-RECEIPT-QUICK-FIXES",
+  "agent": "reviewer",
+  "stage": "review_gate",
+  "verdict": "APPROVED",
+  "checks": [
+    {
+      "item": "POS sale creation now derives authoritative gross price, gross discounts and VAT from pricing data instead of persisting zero tax",
+      "ok": true
+    },
+    {
+      "item": "Receipt and return builders render gross unit/subtotal/discount/IVA consistently with stored order totals and refund VAT-inclusive amounts",
+      "ok": true
+    },
+    {
+      "item": "POS lookup/catalog/order-item APIs now expose gross priceCents so cashier UI and recovered sales stay aligned with printed totals",
+      "ok": true
+    },
+    {
+      "item": "Frontend checkout cart sync reconciles existing server lines with PATCH/DELETE instead of duplicate POSTs and extracts the human backend error message",
+      "ok": true
+    },
+    {
+      "item": "Changed files remain type-safe and formatting-safe (`cd project && npm run typecheck`, `git diff --check`)",
+      "ok": true
+    }
+  ],
+  "issues": [],
+  "notes": [
+    "Reviewer revalidated the changed-flow diff and confirmed order totals are now treated as gross while tax remains informational instead of additive.",
+    "Targeted DB integration tests for POS receipts/returns are still blocked by a pre-existing migration 057 issue (`type \"w\" does not exist`); this is tracked as unrelated technical debt rather than a regression introduced here."
+  ]
+}