feat(deploy): Cloudflare Pages _headers for iframe embedding#3
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Lets karnstack.com embed /preview/* template previews via iframe by shipping CSP frame-ancestors plus a legacy X-Frame-Options fallback. Also caps /templates.json caching at 60s so new templates surface on the landing page without waiting on CDN expiry. Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>
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Summary
public/_headersso the Cloudflare Pages deploy shipsContent-Security-Policy: frame-ancestorsfor/preview/*, lettingkarnstack.com(and subdomains) embed template previews via iframe.X-Frame-Options: ALLOW-FROMline for older browsers — modern browsers ignore it and rely on CSP./templates.jsonfor 60s so the karnstack landing page's manifest fetch picks up newly added templates within a minute.Unblocks Phase 1 of
docs/superpowers/plans/2026-05-01-resumex-deploy-and-landing.md(Task 4). Everything else in Phase 1 is Cloudflare dashboard work.Test plan
pnpm build— confirmeddist/_headersis emitted with the right contentcurl -I https://resumex.karnstack.com/preview/minimal-monoshows theContent-Security-Policy: frame-ancestors ...headercurl -I https://resumex.karnstack.com/templates.jsonshowsCache-Control: public, max-age=60https://resumex.karnstack.com/preview/<id>from akarnstack.comorigin loads without "refused to display in frame" errors🤖 Generated with Claude Code