Managing Trust Connections via Org Avatar Account

Organisation trust helpers are now available through the typed avatar wrapper.

Available methods:

• trust_relations, aggregated_trust_relations, trusts, trusted_by
• trust_add(&[...], expiry) and trust_remove(&[...])
• pathfinding and transfer helpers that depend on the resulting trust graph

The calling pattern is the same as for human avatars: attach a runner, fetch the typed organisation avatar, then call trust_add or trust_remove.