fix: revert search return type to Array<Memory> (matches unwrap logic)

Someone else's changes unwrap the v3 envelope in the client,
so the return type should stay as Array<Memory> for consistency.

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

mem0-ts/src/client/mem0.ts

@@ -280,7 +280,7 @@ export default class MemoryClient {
   async search(
     query: string,
     options?: SearchMemoryOptions,
-  ): Promise<{ results: Array<Memory> }> {
+  ): Promise<Array<Memory>> {
     if (this.telemetryId === "") await this.ping();
     const payloadKeys = Object.keys(options || {});
     this._captureEvent("search", [payloadKeys]);