Function load_primary_memory_appendix 

pub fn load_primary_memory_appendix(
    workspace_root: &Path,
    agent_name: &str,
    scope: Option<SubagentMemoryScope>,
) -> Result<Option<String>>

Loads a read-only memory appendix for the primary agent from a subagent’s memory scope.

Unlike load_memory_appendix, this does not create directories or prompt for writes.