Add flake8 to pre-commit hooks

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

Author: AFDudley

.pre-commit-config.yaml

@@ -9,3 +9,7 @@ repos:
       - id: check-json
       - id: check-merge-conflict
       - id: check-added-large-files
+  - repo: https://github.com/PyCQA/flake8
+    rev: 7.1.1
+    hooks:
+      - id: flake8