Update CLAUDE.md: ruff replaces black/flake8, add mypy

Author: craigds

.gitignore

@@ -8,5 +8,6 @@ __pycache__/
 .python-version
 .vscode/
 .ruff_cache/
+uv.lock
 
 .claude/settings.local.json

CLAUDE.md

@@ -18,11 +18,11 @@ tox
 # Run a single test
 pytest -v fieldsignals/tests/test_signals.py::TestPreSave::test_pre_save_changed
 
-# Format code
-black .
-
 # Lint
-flake8
+ruff check .
+
+# Type check
+tox -e mypy
 ```
 
 ## Architecture