Many comps lookups in one request (one call per query)

Each query is answered exactly as GET /api/v1/comps would answer it. A string query resolves as a listing id, a tracked item slug, a category slug, or free text naming a tracked item ("2015 Ford F150" resolves to ford-f-150); an object takes GET's own params. Max 25 queries (100 on Pro+). Each query costs one call, charged all or nothing up front: a batch that would cross the monthly quota is refused with 429 and charges nothing. Per-item failures (unknown item, item-level comps on a free key) come back inside data with their own status and code.