Function architecture_model_for 

pub fn architecture_model_for(
    unit_sources: &HashMap<String, Vec<PathBuf>>,
    snapshots: &HashMap<PathBuf, String>,
    sequence_info: &HashMap<String, ContextSequenceInfo>,
) -> ArchModel

Build the project-wide architecture model from the round’s own retained tables. A thin wrapper around architecture::architecture_model so the lib.rs handler stays a committed_analysis guard chain, like its two siblings.