Group Avatars

Group avatars/currencies aggregate collateral from trusted tokens and mint group tokens. Today you can query group info, memberships, and balances; group mint/redeem is runner-dependent.

Read-only:

• Query groups, groupMemberships, and token balances for a group.
• Pathfinding to/from group tokens (flows prep only).

Runner-required (deferred):

• Group creation, invites, group token mint/redeem, trust config updates.