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Configure R2 cache rules (litmus-exy0)

Set up cache headers via Cloudflare cache rules (or R2 response headers):

  • Images (*.webp): 1 year edge + browser TTL via Cloudflare cache rule
  • manifest.json: 1 minute edge + browser TTL via Cloudflare cache rule
  • CORS: deferred to smoke test — custom domain through Cloudflare proxy should handle it
  • Verify headers — CORS working, cache rules showing DYNAMIC (needs follow-up)