Opportunistic markdown source discovery
markit now fetches raw markdown from docs sites instead of converting their HTML. Four detection methods, in priority order:
Accept: text/markdownheader on every request (Cloudflare, Vercel)<link rel="alternate" type="text/markdown">tags in the HTML- VitePress marker detection → fetches
.mdsource files /llms.txtfor root URLs (Stripe, Anthropic, etc.)
No extra requests for normal sites. The second fetch only fires when a markdown source is confirmed in the response.
Closes #13
Full Changelog: v0.5.2...v0.5.3