Function create_notes_atomic_with_attachments 

pub async fn create_notes_atomic_with_attachments(
    runtime: &KhiveRuntime,
    specs: Vec<AtomicNoteSpec<'_>>,
    attachments: &[NewAttachment],
) -> RuntimeResult<(Vec<Note>, EmbeddingTruncationReport)>

Create notes and their role-keyed attachments in the same writer transaction. The existing note, FTS, vector and revision accounting is preserved.