feat(git): add pre-commit hook with setup script

- Add scripts/pre-commit hook that runs lint:check and mypy:check
- Add scripts/setup-pre-commit-hook.sh for easy installation
- Update CONTRIBUTING.md with setup and usage instructions
- Ensures all commits pass quality checks before being created

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

Author: dhellmann

CONTRIBUTING.md

@@ -44,6 +44,9 @@ git remote add upstream https://github.com/python-wheel-build/fromager.git
 
 # 4. Create development environment
 hatch env create
+
+# 5. Install pre-commit hook (optional but recommended)
+./scripts/setup-pre-commit-hook.sh
 ```
 
 ### Contribution Workflow
@@ -72,6 +75,25 @@ git push origin feat/<short-description>
 # 7. Create a pull request on GitHub
 ```
 
+### Pre-commit Hook (Recommended)
+
+To ensure quality checks run automatically before each commit, install the pre-commit hook that runs both linting and mypy type checking:
+
+```bash
+# Install the pre-commit hook (run once after cloning)
+./scripts/setup-pre-commit-hook.sh
+
+# The hook automatically runs before each commit:
+# - hatch run lint:check
+# - hatch run mypy:check
+
+# If the hook fails, it will prevent the commit and show helpful messages
+# You can fix issues automatically with:
+hatch run lint:fix
+```
+
+The pre-commit hook prevents commits that would fail CI quality checks, saving time and ensuring consistent code quality.
+
 ---
 
 ## Coding Standards

scripts/pre-commit

@@ -0,0 +1,26 @@
+#!/usr/bin/env bash
+#
+# Git pre-commit hook to run quality checks
+# This ensures all commits pass linting and type checking
+#
+
+set -e  # Exit immediately if any command fails
+
+echo "Running pre-commit checks..."
+
+# Run lint check
+echo "🔍 Running lint check..."
+if ! hatch run lint:check; then
+    echo "❌ Lint check failed. Please fix linting issues and try again."
+    echo "   You can run 'hatch run lint:fix' to automatically fix many issues."
+    exit 1
+fi
+
+# Run mypy type checking
+echo "🔍 Running mypy type check..."
+if ! hatch run mypy:check; then
+    echo "❌ MyPy type check failed. Please fix type annotations and try again."
+    exit 1
+fi
+
+echo "✅ All pre-commit checks passed!"

scripts/setup-pre-commit-hook.sh

@@ -0,0 +1,35 @@
+#!/usr/bin/env bash
+#
+# Setup script to install the pre-commit hook for fromager development
+#
+# This script copies the pre-commit hook to .git/hooks/ and makes it executable
+#
+
+set -e
+
+SCRIPT_DIR="$(cd "$(dirname "${BASH_SOURCE[0]}")" && pwd)"
+REPO_ROOT="$(cd "$SCRIPT_DIR/.." && pwd)"
+HOOKS_DIR="$REPO_ROOT/.git/hooks"
+PRE_COMMIT_HOOK="$HOOKS_DIR/pre-commit"
+
+echo "🔧 Setting up pre-commit hook for fromager..."
+
+# Check if we're in a git repository
+if [ ! -d "$HOOKS_DIR" ]; then
+    echo "❌ Error: Not in a git repository or .git/hooks directory not found"
+    exit 1
+fi
+
+# Copy the pre-commit hook script
+cp "$SCRIPT_DIR/pre-commit" "$PRE_COMMIT_HOOK"
+
+# Make it executable
+chmod +x "$PRE_COMMIT_HOOK"
+
+echo "✅ Pre-commit hook installed successfully!"
+echo ""
+echo "The hook will now run 'hatch run lint:check' and 'hatch run mypy:check'"
+echo "before every commit to ensure code quality."
+echo ""
+echo "To bypass the hook for a specific commit (not recommended):"
+echo "  git commit --no-verify -m \"message\""