Retrieves a subgroup configuration by name.
Examples
if (FALSE) { # \dontrun{
registry <- load_config()
config <- get_subgroup_config(registry, "age_groups")
} # }
Retrieves a subgroup configuration by name.
if (FALSE) { # \dontrun{
registry <- load_config()
config <- get_subgroup_config(registry, "age_groups")
} # }