Assign human names, customize role positions, and generate high-res SVG avatars persisted to S3 brains/{brain_id}/avatars/
s3://fuzeagent-org-default/brains/brain_agent_python_dev/avatars/avatar.svg
s3://fuzeagent-org-default/brains/brain_cross_frontend/avatars/avatar.svg
s3://fuzeagent-org-default/brains/brain_cross_devops/avatars/avatar.svg
s3://fuzeagent-org-default/brains/brain_org_global/avatars/avatar.svg