Advanced AI Prompt for ECS Fargate EFS Persistent Volume Mounting

Act as a Serverless Container Architect. Detail the highly specific, zero-error JSON Task Definition required to mount an Amazon EFS persistent file system ([EFS_FILE_SYSTEM_ID]) directly into a stateless AWS ECS Fargate container at the [CONTAINER_MOUNT_PATH]. You must mandate the use of the specific [ACCESS_POINT_ID] to physically enforce POSIX directory-level isolation and prevent root access to the wider EFS volume. Output the exact IAM Task Execution Role JSON policy required to authorize the Fargate agent to successfully execute `elasticfilesystem:ClientMount` and `ClientWrite`.