fix: use Vercel-supported cache directive

[corwinm]

Summary

• Fix route Cache-Control headers to use Vercel-supported s-maxage instead of s-max-age
• Update page, blog post, RSS, sitemap, and robots headers consistently
• Add a Vitest regression test that prevents the unsupported directive from returning

Test Plan

• pnpm vitest run app/lib/cache-control.test.ts failed before the header fix and passed after it
• pnpm lint
• pnpm typecheck
• pnpm test
• pnpm build
• Production server smoke test with PORT=4173 pnpm exec react-router-serve ./build/server/nodejs_eyJydW50aW1lIjoibm9kZWpzIn0/index.js; verified cache-control contains s-maxage on /, /resume, /wishlist, /rss.xml, /sitemap.xml, /robots.txt, and /blog/arashi

[vercel]

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Project	Deployment	Actions	Updated (UTC)
corwinm-remix	Ready	Preview, Comment	Jul 1, 2026 7:32pm