Bedrock AgentCore: 3-API-call agent setup, VPC egress, plus Athena and SageMaker shipments

AWS introduced a managed agent harness in Bedrock AgentCore that cuts autonomous agent deployment to just 3 API calls, added secure VPC egress to AgentCore Gateway and Identity, and shipped Athena managed federated connectors, S3 checksum algorithms, SageMaker Unified Studio VPC support, and AI agent metrics in Connect.