RFD 3101: Edge cache warmup strategy

[lowlydba]

We have repeated launch-day latency spikes in regions where the CDN has little historical traffic. This proposal explores a warmup plan that prefetches top index and RFD detail pages before public announcements. The rollout would start with one low-traffic region and compare p95 TTFB, cache hit ratio, and origin error rate over two release cycles. If we see a measurable improvement without origin saturation, we can standardize this as part of release prep and document guardrails for large content drops.