fix: include .well-known directory in Jekyll build

Added .well-known to the include configuration to ensure Jekyll copies
hidden directories to the _site output. By default, Jekyll excludes files
and directories starting with a dot.

This fix allows the AI domain data plugin's generated domain-profile.json
file to be accessible at /.well-known/domain-profile.json on the deployed
site.

🤖 Generated with [Claude Code](https://claude.com/claude-code)

Co-Authored-By: Claude Sonnet 4.5 <noreply@anthropic.com>

Author: jbwashington

_config.yml

@@ -30,6 +30,8 @@ ai_domain_data:
 # Build settings
 markdown: kramdown
 theme: minima
+include:
+    - .well-known
 plugins:
     - jekyll-feed
     - jekyll-redirect-from