Purpose: search the cross-domain benchmark layer - the same verifiable-anchor methodology we apply to rCB, extended to other domains (carbon footprint & markets / telecom & space / health & nutrition / new energy & batteries / compute & energy). Records are policy milestones, official limit values, standards status and dated price snapshots, each with an issuer, an as-of date, a confidence grade and a source_url. Guidelines: filter by domain (carbon / telecom / health / energy / compute), region, category or confidence; every record is meant to be citable - pair with get_domain_benchmark by ID for the full record including the source link. Limits: anchor facts only - no price forecasts (carbon prices are dated snapshots, not live quotes), no medical or dosing advice, no diagnosis; the domain taxonomy is ours, not the issuing body's. Ex: query_domain_benchmarks(domain='carbon'), query_domain_benchmarks(keyword='CBAM'), query_domain_benchmarks(domain='health', confidence='A', language='en'), query_domain_benchmarks(domain='compute').