Update .gitignore with development artifacts

Add patterns to ignore:
- .DS_Store files
- Backup files (*.bak)
- Playwright MCP screenshots
- Downloaded site copies
- Development scripts
- Python cache files
- Claude skills directory

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

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

Author: jeremymanning

.gitignore

@@ -9,3 +9,21 @@ vendor/
 # Claude Code instructions (local only)
 CLAUDE.md
 notes/
+
+# Development artifacts
+.DS_Store
+*.bak
+.playwright-mcp/
+downloaded_site/
+scripts/
+
+# Python
+__pycache__/
+*.pyc
+.pytest_cache/
+*.egg-info/
+venv/
+.venv/
+
+# Claude skills (local only)
+.claude/