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Vercel edge runtime adds a default `Cache-Control: public` to responses.
The gateway's `!mergedHeaders.has('Cache-Control')` guard prevented
s-maxage tier headers from being applied, so Cloudflare had no TTL
guidance — caching was inconsistent across endpoints.
Remove the guard so the gateway always sets the correct tier
(fast/medium/slow/static/daily) with proper s-maxage values.