chore: add .claudeignore for agent context optimization

Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>

Author: sandia777

.claudeignore

@@ -0,0 +1,41 @@
+# Common ignores
+node_modules/
+__pycache__/
+*.pyc
+*.pyo
+*.pyd
+.Python
+*.so
+*.egg
+*.egg-info/
+dist/
+build/
+.eggs/
+.next/
+
+# Virtual environments
+.venv/
+venv/
+ENV/
+env/
+
+# Testing & coverage
+.pytest_cache/
+.mypy_cache/
+.ruff_cache/
+htmlcov/
+.coverage
+.coverage.*
+.tox/
+noxfile.py
+.nox/
+
+# IDE
+.vscode/
+.idea/
+*.swp
+*.swo
+*~
+
+# Git
+.git/