Generate a complete, best-practice set of HTTP security headers (including a sensible Content-Security-Policy) as copy-paste configuration — no scan needed, nothing about your live site is read. Pick a `preset`: 'recommended' is a safe baseline that works for most sites, 'strict' is hardened with a nonce-based CSP for higher security, and 'report-only' puts the CSP in report-only mode so you can roll it out and watch for breakage before enforcing it. Advanced users can instead pass a full `config` object to fine-tune every header; if you pass neither, it defaults to 'recommended'. Returns the resulting headers as name/value pairs, plus ready-to-paste output for nginx, Apache, Caddy, Cloudflare, a Netlify/Cloudflare-Pages `_headers` file, and raw headers, along with any warnings. Use this to set up headers on a new or unscanned site; use analyze_security_headers first when you want to see what an existing site is already missing.
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