fix: resolve merge conflicts with upstream TS changes

Take team's upstream changes for search return type
(Promise<{results: Array<Memory>}>) and test assertions.

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

mem0-ts/src/client/mem0.ts

@@ -273,7 +273,6 @@ export default class MemoryClient {
       headers: this.headers,
       body: JSON.stringify(body),
     });
-    // Unwrap v1.1 format: { results: [...] } → [...]
     return Array.isArray(response) ? response : (response?.results ?? response);
   }