fix: update integration tests for v3 search response format

v3 search returns {results: [...]} instead of a bare array.
Updated waitForSearchResults helper and search edge case tests
to unwrap the v3 envelope.

Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>

mem0-ts/src/client/tests/integration/helpers.ts

@@ -92,8 +92,12 @@ export async function waitForSearchResults(
   maxRetries = 4,
 ): Promise<Memory[]> {
   for (let attempt = 1; attempt <= maxRetries; attempt++) {
-    const results = await withRetry(() => client.search(query, options));
-    if (Array.isArray(results) && results.length > 0) {
+    const response = await withRetry(() => client.search(query, options));
+    // v3 returns { results: [...] }, unwrap for backward compat
+    const results = Array.isArray(response)
+      ? response
+      : (response?.results ?? []);
+    if (results.length > 0) {
       return results;
     }
     if (attempt < maxRetries) {