Function render_library_index 

pub fn render_library_index(
    manifest: &Manifest,
    store: &LineageStore,
    live: &HashMap<&str, &Clip>,
) -> String

Render the whole-library index as a stable, pretty-printed JSON document.

One row per manifest entry in clip-id order, listing only clips whose file exists on disk so the index never advertises a missing file. Durable fields come from the manifest and the archived LineageStore; live-only fields (artist, handle, duration, tags) come from live when the clip was seen this run and are null otherwise. album is the raw logical title, which legitimately differs from the sanitised segment inside path.