fix(ts-sdk): unwrap v1.1 search response in client, fix TS2339 type errors

search() now unwraps { results: [...] } -> [...] internally (same
pattern getAll() already uses), so callers always get Array<Memory>.

Removes redundant unwrap logic from integration test helpers and
search.test.ts that caused TS2339 'Property results does not exist
on type never' — the false branch of Array.isArray() was unreachable
since search() is typed as returning Array<Memory>.

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

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

@@ -92,11 +92,7 @@ export async function waitForSearchResults(
   maxRetries = 4,
 ): Promise<Memory[]> {
   for (let attempt = 1; attempt <= maxRetries; attempt++) {
-    const response = await withRetry(() => client.search(query, options));
-    // v3 returns { results: [...] }, unwrap for backward compat
-    const results = Array.isArray(response)
-      ? response
-      : (response?.results ?? []);
+    const results = await withRetry(() => client.search(query, options));
     if (results.length > 0) {
       return results;
     }