One endpoint, three regions, five minutes (live run)

A real timed run against the single MCP endpoint:

1. Taiwan — monthly PM2.5, July 2026: 71 stations, mean 8.0 μg/m³ (tw_query_rows, dataset 28202)
2. Hong Kong — AQHI right now: General 2–3 (Low), Roadside 3 (Low) (hk_rt_air_quality)
3. UK — uk_search_datasets("road safety") → Department for Transport's Road Safety Data (uk-ogl, 5 resources) plus council-level sets

Three catalogs, three answer shapes, one auth header. The units differ (see the AQHI thread) — the plumbing doesn't.