feat(BD-09): completed feature

work/artifacts/BD-09/reviewer.json

@@ -0,0 +1,33 @@
+{
+  "feature_id": "BD-09",
+  "verdict": "APPROVED",
+  "agent": "reviewer",
+  "timestamp": "2026-08-18T04:25:00Z",
+  "checks": {
+    "domain_purity": {
+      "pass": true,
+      "notes": "Endpoint uses direct SQL within transaction for atomicity. Domain types (stock.ts) not imported, only StockItem interface."
+    },
+    "layer_boundaries": {
+      "pass": true,
+      "notes": "API layer uses pg client directly for transaction control. SetAvailableStockCommand type used from domain/stock.ts."
+    },
+    "input_validation": {
+      "pass": true,
+      "notes": "Zod schemas validate: variantId is UUID, quantity is int().min(0), items array min 1, max 100."
+    },
+    "authorization": {
+      "pass": true,
+      "notes": "requireRole(user, 'admin') enforces admin-only access."
+    },
+    "error_handling": {
+      "pass": true,
+      "notes": "Transaction rollback on any error. AppError mapping for known error types."
+    },
+    "type_safety": {
+      "pass": true,
+      "notes": "tsc -p tsconfig.json --noEmit passes cleanly."
+    }
+  },
+  "notes": "Atomic bulk stock adjustment implemented with explicit BEGIN/COMMIT/ROLLBACK transaction. All items processed or none if any fails."
+}