Fix up duplicate URLs in docs sitemap

Author: dacharyc

docs/.vitepress/config.ts

@@ -3,6 +3,7 @@ import { defineConfig } from 'vitepress';
 export default defineConfig({
   title: 'AFDocs',
   description: 'Test your documentation site against the Agent-Friendly Documentation Spec',
+  cleanUrls: true,
 
   sitemap: {
     hostname: 'https://afdocs.dev',

docs/public/.htaccess

@@ -22,6 +22,12 @@ RewriteCond %{HTTP_ACCEPT} text/markdown
 RewriteCond %{REQUEST_FILENAME}.md -f
 RewriteRule ^(.*)$ /log-agent-signal.php?path=$1.md&trigger=content-negotiation [L,QSA]
 
+# 1. Content negotiation — .html URL with .md equivalent
+RewriteCond %{HTTP_ACCEPT} text/markdown
+RewriteCond %{REQUEST_URI} ^(.*)\.html$
+RewriteCond %{DOCUMENT_ROOT}%1.md -f
+RewriteRule ^(.*)\.html$ /log-agent-signal.php?path=$1.md&trigger=content-negotiation [L,QSA]
+
 # 2. Direct .md file requests
 RewriteCond %{REQUEST_URI} \.md$
 RewriteCond %{REQUEST_FILENAME} -f