feat(dev): add cross-platform git hooks and fix line ending config

- Add git hooks as managed artifacts in scripts/git-hooks/
  - pre-commit: extreme quality enforcement with formatting, linting, tests
  - pre-push: comprehensive validation before sharing code
  - commit-msg: conventional commit format enforcement
- Update setup-dev-env.sh for cross-platform git hook installation
  - Prefer symlinks for automatic updates
  - Fall back to copying on Windows without symlink support
  - Provide clear guidance for enabling Windows symlinks
- Fix git line ending configuration for cross-platform compatibility
  - Windows: core.autocrlf=true (convert LF↔CRLF)
  - Linux/macOS: core.autocrlf=input (preserve LF, warn about CRLF)
  - Repository stores LF line endings consistently

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

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

Author: flyingrobots

scripts/git-hooks/commit-msg

@@ -0,0 +1,74 @@
+#!/bin/sh
+# HyperDAG commit-msg hook - Enforce conventional commit format
+# This hook validates commit messages for consistency and clarity
+
+set -eu
+
+commit_file="$1"
+commit_msg=$(cat "$commit_file")
+
+# Check for conventional commit format
+# Pattern: type(optional scope): description
+# Examples: feat(core): add hypergraph structure, fix(memory): resolve leak in pool allocator
+
+if ! echo "$commit_msg" | grep -qE '^(feat|fix|docs|style|refactor|perf|test|chore|ci|build)(\(.+\))?: .{1,50}'; then
+    cat << EOF
+❌ Invalid commit message format!
+
+Commit messages must follow conventional commit format:
+  <type>[optional scope]: <description>
+
+Valid types:
+  feat:     A new feature
+  fix:      A bug fix
+  docs:     Documentation only changes
+  style:    Changes that do not affect the meaning of the code
+  refactor: A code change that neither fixes a bug nor adds a feature
+  perf:     A code change that improves performance
+  test:     Adding missing tests or correcting existing tests
+  chore:    Changes to the build process or auxiliary tools
+  ci:       Changes to CI configuration files and scripts
+  build:    Changes that affect the build system or external dependencies
+
+Examples:
+  ✓ feat(core): add hypergraph node insertion
+  ✓ fix(memory): resolve pool allocator leak
+  ✓ docs: update API documentation
+  ✓ perf(traversal): optimize DFS algorithm
+
+Your commit message:
+  $commit_msg
+
+EOF
+    exit 1
+fi
+
+# Check commit message length
+first_line=$(echo "$commit_msg" | head -n1)
+if [ ${#first_line} -gt 72 ]; then
+    cat << EOF
+❌ Commit message first line too long (${#first_line} chars)!
+
+First line should be 72 characters or less.
+Current: $first_line
+
+EOF
+    exit 1
+fi
+
+# Check for imperative mood in description
+description=$(echo "$first_line" | sed -E 's/^[^:]+: //')
+if echo "$description" | grep -qE '^(added|fixed|updated|changed|removed)'; then
+    cat << EOF
+⚠️  Consider using imperative mood in commit description.
+
+Instead of: "added feature" → use: "add feature"
+Instead of: "fixed bug"    → use: "fix bug"
+
+Current: $description
+
+EOF
+    # Non-blocking warning
+fi
+
+echo "✅ Commit message format is valid"

scripts/git-hooks/pre-commit

@@ -0,0 +1,66 @@
+#!/bin/sh
+# HyperDAG pre-commit hook - Extreme quality enforcement
+# This hook runs before every commit to ensure code quality standards
+
+set -eu
+
+# Import shared utilities
+. "$(git rev-parse --show-toplevel)/scripts/shlib.sh"
+
+echo "🔧 Running pre-commit quality checks..."
+
+PROJECT_ROOT="$(git rev-parse --show-toplevel)"
+pushd "$PROJECT_ROOT" >/dev/null
+
+# Format all staged C/C++ files
+echo "📝 Formatting staged files..."
+git diff --cached --name-only --diff-filter=ACM | grep -E '\.(c|h|cpp|hpp)$' | while read -r file; do
+    if [ -f "$file" ]; then
+        clang-format -i "$file"
+        git add "$file"
+        echo "  ✓ Formatted: $file"
+    fi
+done
+
+# Run quick static analysis on staged files
+echo "🔍 Running clang-tidy on staged files..."
+git diff --cached --name-only --diff-filter=ACM | grep -E '\.(c|cpp)$' | while read -r file; do
+    if [ -f "$file" ]; then
+        if ! clang-tidy "$file" --quiet; then
+            echo "❌ clang-tidy failed for: $file"
+            popd >/dev/null
+            exit 1
+        fi
+        echo "  ✓ Clean: $file"
+    fi
+done
+
+# Check include guards
+echo "🛡️ Checking include guards..."
+if ! ./scripts/check-include-guards.sh; then
+    echo "❌ Include guard check failed"
+    popd >/dev/null
+    exit 1
+fi
+
+# Check version consistency
+echo "📋 Checking version consistency..."
+if ! ./scripts/check-version-consistency.sh; then
+    echo "❌ Version consistency check failed"
+    popd >/dev/null
+    exit 1
+fi
+
+# Run quick tests if available
+if [ -d "build" ] && [ -f "build/Makefile" ]; then
+    echo "🧪 Running quick tests..."
+    if ! ./scripts/run-quick-tests.sh; then
+        echo "❌ Quick tests failed"
+        popd >/dev/null
+        exit 1
+    fi
+fi
+
+popd >/dev/null
+echo "✅ All pre-commit checks passed!"
+echo "💡 Tip: Run 'make all' to ensure full build compatibility"

scripts/git-hooks/pre-push

@@ -0,0 +1,61 @@
+#!/bin/sh
+# HyperDAG pre-push hook - Comprehensive validation before sharing
+# This hook runs before pushing to ensure shared code meets extreme quality standards
+
+set -eu
+
+# Import shared utilities
+. "$(git rev-parse --show-toplevel)/scripts/shlib.sh"
+
+echo "🚀 Running pre-push validation..."
+
+PROJECT_ROOT="$(git rev-parse --show-toplevel)"
+pushd "$PROJECT_ROOT" >/dev/null
+
+# Full static analysis
+echo "🔍 Running comprehensive static analysis..."
+if ! ./scripts/run-clang-tidy.sh; then
+    echo "❌ Static analysis failed"
+    popd >/dev/null
+    exit 1
+fi
+
+# Security scan
+echo "🛡️ Running security audit..."
+if ! ./scripts/security-audit.sh; then
+    echo "❌ Security audit failed"
+    popd >/dev/null
+    exit 1
+fi
+
+# Full test suite
+if [ -d "build" ]; then
+    echo "🧪 Running full test suite..."
+    if ! make -C build test; then
+        echo "❌ Test suite failed"
+        popd >/dev/null
+        exit 1
+    fi
+    
+    # Memory leak detection if ASan is available
+    echo "🧪 Checking for memory leaks..."
+    if [ -f "build/bin/hyperdag_tests" ]; then
+        if ! ASAN_OPTIONS="abort_on_error=1:detect_leaks=1" build/bin/hyperdag_tests; then
+            echo "❌ Memory leak detected"
+            popd >/dev/null
+            exit 1
+        fi
+    fi
+fi
+
+# Performance regression check
+if [ -d "benchmarks" ]; then
+    echo "📊 Running performance regression check..."
+    if ! ./scripts/profile.sh --check-regression; then
+        echo "⚠️ Performance regression detected (non-blocking)"
+    fi
+fi
+
+popd >/dev/null
+echo "✅ All pre-push checks passed!"
+echo "🎉 Code is ready for sharing - maintaining extreme quality standards!"