Phase 2 aggregate reader: fast path via CDN blob#1306
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…s fanout on any failure (kills the SRH-burst Awaiting samples pattern)
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Reads the aggregate snapshot from https://kv.openchainbench.com/aggregate/latest.json (published every ~60s by the materialize worker after tier A) instead of fanning out ~150 concurrent SRH GETs on every homepage revalidate. Any failure (network, schema, quorum <40 benches) falls through to the existing Redis-via-SRH path — worst case is what we had before.