Each council member from config is now registered as a named agent (e.g. 'Council: Claude Opus 4.6') via registerCouncilMemberAgents(). Adds humanizeModelId() to derive friendly display names from model IDs. Athena's prompt gets the member list appended so it can call task(subagent_type=...) for each.
Ultraworked with [Sisyphus](https://github.com/code-yeongyu/oh-my-opencode)
Co-authored-by: Sisyphus <clio-agent@sisyphuslabs.ai>
