fix: preserve tenant and protocolVersion from AgentInterface in ClientBuilder#773

ehsavoie merged 2 commits intoa2aproject:maina2aproject/a2a-java:mainfrom

Lirons01:issue-772-tenant-not-preserved-in-client-builderLirons01/a2a-java:issue-772-tenant-not-preserved-in-client-builderCopy head branch name to clipboard