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/search.test.ts

@@ -108,30 +108,22 @@ describeIntegration("MemoryClient Integration — Search & History", () => {
   // ─── Edge cases ─────────────────────────────────────────
   describe("edge cases", () => {
     test("search for non-existent user returns empty results", async () => {
-      const response = await client.search("anything", {
+      const results = await client.search("anything", {
         filters: { userId: `nonexistent-user-${randomUUID()}` },
       });
-      // v3 returns { results: [...] }
-      const results = Array.isArray(response)
-        ? response
-        : (response?.results ?? []);
 
       expect(Array.isArray(results)).toBe(true);
       expect(results.length).toBe(0);
     });
 
     test("search with top_k param does not throw", async () => {
-      const response = await client.search(
+      const results = await client.search(
         "Tell me about integration test user",
         {
           filters: { userId: TEST_USER_ID },
           topK: 1,
         },
       );
-      // v3 returns { results: [...] }
-      const results = Array.isArray(response)
-        ? response
-        : (response?.results ?? []);
 
       expect(Array.isArray(results)).toBe(true);
     });