Function initial_dictionary 

pub fn initial_dictionary(
    kind: InitialGroupKind<'_>,
    policy_set: &PolicySet,
    opts: &GroupMetadataOptions,
    creator_inbox_id: &str,
    commit_log_signer: Option<&[u8]>,
    catalogue: &[ApplicationComponentDefinition],
) -> Result<AppDataDictionary, MigrationError>

Build the complete dictionary stored in epoch zero. Collection values are stored snapshots, not proposal deltas. catalogue is the client’s backend snapshot; only its eligible definitions enter the registry, and no component value is taken from it.