SEO Audit Workflow

Perform a comprehensive technical SEO audit. Analyze the following areas in order:

1. **Crawlability & Indexing** — robots.txt, XML sitemaps, canonical tags, noindex directives
2. **Core Web Vitals** — LCP, FID/INP, CLS targets and common offenders
3. **On-Page SEO** — Title tags, meta descriptions, heading hierarchy, internal linking
4. **Schema Markup** — Structured data completeness, validation errors
5. **Mobile Usability** — Viewport config, touch targets, font sizes
6. **Security** — HTTPS, mixed content, HSTS headers

For each issue found, provide:
- **Severity:** Critical / High / Medium / Low
- **Impact:** Estimated traffic/ranking impact
- **Fix:** Specific code or config change required
- **Priority Score:** 1-10 (higher = fix first)

Output as a ranked action list, most critical first.