Exclude .github/ and CLAUDE.md from production deploys

Both directories/files are development infrastructure with no runtime
purpose on the server and their presence on the web root is unnecessary
information disclosure.

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

Author: carlbennett

etc/deploy-ignore.txt

@@ -24,7 +24,9 @@
 .gitattributes
 .gitignore
 .gitkeep
+/.github/
 /.vscode/
+/CLAUDE.md
 /CONTRIBUTING.md
 /README.md
 /composer.json