fix(qlty): escape curly braces in cookiecutter template exclusion pattern

The glob parser interprets `{}` as brace expansion syntax. Escape with
backslashes to match the literal directory name `{{cookiecutter.project_slug}}`.

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

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

Author: williaby

.qlty/qlty.toml

@@ -47,7 +47,8 @@ exclude_patterns = [
   "**/tmp_cleanup/**",
   # Exclude cookiecutter template directories (not actual code)
   # Note: Template files contain Jinja2 syntax that breaks parsers
-  "{{cookiecutter.project_slug}}/**",
+  # Curly braces must be escaped to avoid glob brace expansion
+  "\\{\\{cookiecutter.project_slug\\}\\}/**",
 ]
 
 test_patterns = [