Function discoverable_references 

pub fn discoverable_references(doc: &AutoCommit) -> Vec<RecordCheckout>

A deterministic, resource-bounded view of collaborator-supplied room names. It reads at most a small fixed prefix of the CRDT map and returns at most super::MAX_DISCOVERED_ROOM_RECORDS valid entries. It does not open records, create persistence, or join record routes; the caller must make that explicit after choosing a record.