feat: refactor remote A2A agent to use A2A SDK client

PiperOrigin-RevId: 844724636

Author: google-genai-bot

a2a/pom.xml

@@ -16,7 +16,7 @@
   <properties>
     <java.version>17</java.version>
     <maven.compiler.release>${java.version}</maven.compiler.release>
-    <a2a.sdk.version>0.3.0.Beta1</a2a.sdk.version>
+    <a2a.sdk.version>0.3.2.Final</a2a.sdk.version>
     <google.adk.version>${project.version}</google.adk.version>
     <guava.version>33.0.0-jre</guava.version>
     <jackson.version>2.19.0</jackson.version>
@@ -89,6 +89,11 @@
       <artifactId>a2a-java-sdk-http-client</artifactId>
       <version>${a2a.sdk.version}</version>
     </dependency>
+    <dependency>
+      <groupId>io.github.a2asdk</groupId>
+      <artifactId>a2a-java-sdk-client</artifactId>
+      <version>${a2a.sdk.version}</version>
+    </dependency>
     <dependency>
       <groupId>junit</groupId>
       <artifactId>junit</artifactId>