feat(POS-004): completed feature

work/artifacts/POS-004/qa.json

@@ -0,0 +1,13 @@
+{
+  "feature_id": "POS-004",
+  "agent": "qa",
+  "stage": "qa_gate",
+  "verdict": "APPROVED",
+  "summary": "tsc 0, 8 unit tests green, verify.sh green.",
+  "checks": [
+    {"item": "tsc 0", "ok": true, "evidence": "npm run build 0 errors"},
+    {"item": "tests 8/8", "ok": true, "evidence": "vitest run pos/tests 8 passed"},
+    {"item": "verify.sh", "ok": true, "evidence": "exit 0"}
+  ],
+  "issues": []
+}