fix: exclude virtual environment directories from mdformat hook

- Add exclude pattern to mdformat hook to skip .venv/, venv/, and *.egg-info/ directories
- Prevents mdformat from processing third-party package documentation
- Resolves CI/CD pre-commit hook failures caused by formatting inconsistencies
- Ensures consistent behavior between local development and CI environments

This fixes the "files were modified by this hook" error that was occurring
when mdformat tried to format markdown files in dependency packages.

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

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

Author: SimplicityGuy

.pre-commit-config.yaml

@@ -35,6 +35,7 @@ repos:
           - mdformat-black==0.1.1
           - mdformat-gfm==0.4.1
           - mdformat-tables==1.0.0
+        exclude: ^(.venv/|venv/|.*\.egg-info/)
 
   - repo: https://github.com/astral-sh/ruff-pre-commit
     rev: db90487f48a9dd992d243ef63c156eaffddeaf28  # frozen: v0.12.11