Prefer TLD WHOIS over contradictory registrar referral; revert heuristic override and add referral test\n\n- Keep TLD response when registrar says ‘not found’\n- Revert WHOIS isRegistered to simple availability check\n- Add referral contradiction unit test for .io scenario\n- All tests passing

src/whois/normalize.test.ts

@@ -87,6 +87,8 @@ Registrar: Registrar LLC
   expect(rec.expirationDate).toBe("2027-04-23T00:00:00Z");
 });
 
+// removed: availability override test in favor of referral-level logic
+
 test("WHOIS .edu EDUCAUSE format", () => {
   const text = `
 This Registry database contains ONLY .EDU domains.