- new module cooler: Install, Handle, OpenRedis (no URL in errors), RateLimitStore
(atomic fixed-window Lua script with MemoryStore semantics, per-instance fallback)
- serve installs cooler and publishes the Redis surf.Store before BuildRouter;
BuildRouter looks up a published Store, route:list keeps the memory store
- config keys http.rate_limit.store and redis.url; go-redis v9.23.0
- cooler README, root table row, surf README and rate-limiting, configuration
and scaling docs
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