seo: Google/Bing Search Console + Indexing API setup checklist

[BryanFRD]

Tracking the post-deploy SEO bootstrapping that needs human action (no code change):

• Google Search Console: add property for each domain (ferrlabs.com, ferrflow.com, track.ferrlabs.com, vault.ferrlabs.com, growth.ferrlabs.com, ferrgames.com when DNS done)
• Submit each /sitemap-index.xml via Search Console
• Verify ownership via DNS TXT record (handled by Cloudflare)
• Bing Webmaster Tools: same loop, smaller traffic share but easy
• Set canonical hreflang clusters (FR/EN) explicitly in Search Console where applicable
• Configure Indexing API for fresh content (FerrFlow docs especially)
• Enable Search Console reports: Core Web Vitals, mobile usability, security issues

Out of scope for code repos — captured here so it doesn't get lost.