Lookup items by URN

Resolve many indexed items in one request using a batch of URNs.

Use this for:

• import previews
• server-side enrichment jobs
• list views that need to hydrate many URNs quickly

Behavior:

• Accepts between 1 and 200 URNs per request.
• Returns found indexed item records for matching URNs.

Good to know:

• URNs are normalized into a stable cache signature, so repeated batches are efficient.