Function architect_prepare_source_bundle 

fn architect_prepare_source_bundle(
    store: &ArchitectStore,
    version_id: i64,
    actor_id: i64,
    bundle: &str,
    prepare_grouping: bool,
) -> Result<ArchitectEditorSourceEditPlan, AgentErrorKind>

Stages a bounded multi-file source transaction for an owned editable project. New declarations and their templates can therefore be validated and promoted together.