feat(smartjson): Implement stableOneWayStringify: deterministic, cycle-safe JSON for hashing/comparisons; update docs and tests

test/test.both.ts

@@ -104,4 +104,15 @@ tap.test('should respect simpleOrderArray comparator', async () => {
   expect(ordered.indexOf('"a"')).toBeLessThan(ordered.indexOf('"c"'));
 });
 
+tap.test('stableOneWayStringify should handle circular references without throwing', async () => {
+  const a: any = { name: 'x' };
+  a.self = a;
+  const b: any = { name: 'x' };
+  b.self = b;
+  const s1 = smartjson.stableOneWayStringify(a);
+  const s2 = smartjson.stableOneWayStringify(b);
+  expect(typeof s1).toEqual('string');
+  expect(s1).toEqual(s2);
+});
+
 tap.start();