Remix v2 Performance / SSR Code Review

Targets TypeScript route modules importing from @remix-run/*. See remix-v2-perf-ssr for canonical patterns.

Quick Reference

Issue Type	Reference
Missing `headers` export, unsafe `public` cache, child-drops-parent headers, missing `Vary: Cookie`, `Set-Cookie` + `public`	references/caching-headers.md
Server libs imported without `.server.ts`, `process.env.SECRET_*` leaks, `typeof window` substituted for `.server.ts`	references/server-client-split.md
`new Date()` in render, `Math.random()` in keys, locale formatting without explicit locale, missing `useId()`, blanket `suppressHydrationWarning`	references/hydration.md
`prefetch="render"` on every link, `defer` for fast data, missing `<Suspense>` around `<Await>`, prefetch to side-effect routes	references/prefetch-streaming.md
`dangerouslySetInnerHTML` with untrusted data, missing `loading="lazy"`, missing `links` preload, stylesheet injected in body	references/assets.md