Function add_member 

pub fn add_member(
    input: &Path,
    parent: &str,
    member_name: &str,
    member_kind: &str,
    type_name: Option<&str>,
    verbose: bool,
) -> Result<AddMemberResult, String>

Add a new member (part, attribute, etc.) to an existing element.

Uses AnalysisHost::apply_model_edit() to add a child element via the semantic Model layer, with automatic text re-rendering and SymbolIndex sync.

Arguments

• input - Path to a .sysml file
• parent - Name or qualified name of the parent element
• member_name - Name for the new member
• member_kind - Kind string (e.g., “PartUsage”, “AttributeUsage”, “PartDefinition”)
• type_name - Optional type to assign (e.g., “Engine” for part engine : Engine)
• verbose - Enable verbose output