chore(refactor): snapshot test baseline + no-regression gate truoc refactor open-sse

Co-authored-by: Cursor <cursoragent@cursor.com>

tests/__baseline__/verify-no-regression.mjs

@@ -0,0 +1,28 @@
+// Gate: so kết quả test hiện tại với baseline known-fails.
+// PASS nếu KHÔNG có test nào pass(baseline) → fail(now). Test mới được phép.
+// Usage: node tests/__baseline__/verify-no-regression.mjs <current-results.json>
+import { readFileSync } from "fs";
+
+const knownFails = new Set(
+  readFileSync(new URL("./known-fails.txt", import.meta.url), "utf8")
+    .split("\n").map(s => s.trim()).filter(Boolean)
+);
+
+const resultsPath = process.argv[2];
+if (!resultsPath) { console.error("Missing results.json path"); process.exit(2); }
+
+const r = JSON.parse(readFileSync(resultsPath, "utf8"));
+const nowFails = r.testResults.flatMap(f =>
+  f.assertionResults.filter(a => a.status === "failed")
+    .map(a => f.name.split("/app/")[1] + " :: " + a.fullName)
+);
+
+// Regression = fail bây giờ NHƯNG không có trong baseline known-fails
+const regressions = nowFails.filter(f => !knownFails.has(f));
+
+if (regressions.length) {
+  console.error(`\n❌ REGRESSION: ${regressions.length} test pass→fail:\n`);
+  regressions.forEach(f => console.error("  - " + f));
+  process.exit(1);
+}
+console.log(`✅ No regression. (now fails=${nowFails.length}, baseline known=${knownFails.size}, all known)`);