Make trailing-newlines hook auto-fix instead of validate

- Add stage_fixed: true to trailing-newlines command in .lefthook.yml
- Update check-trailing-newlines script to automatically add missing newlines instead of just reporting them
- Improve ruby-autofix success message to clarify that files are auto-staged
- Ensures consistency with other auto-fixing hooks (autofix, eslint, prettier)

This completes the pre-commit hook race condition fix by making all auto-fixing commands use Lefthook's stage_fixed feature uniformly.

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

Co-Authored-By: Claude <[email protected]>

Author: justin808

.lefthook.yml

@@ -27,6 +27,7 @@ pre-commit:
 
     trailing-newlines:
       run: bin/lefthook/check-trailing-newlines all-changed
+      stage_fixed: true
 
 pre-push:
   commands:

bin/lefthook/check-trailing-newlines

@@ -16,23 +16,13 @@ else
   echo "🔍 Checking trailing newlines on $CONTEXT files..."
 fi
 
-failed_files=""
 for file in $files; do
   if [ -f "$file" ] && [ -s "$file" ]; then
     if ! tail -c 1 "$file" | grep -q '^$'; then
-      echo "❌ Missing trailing newline: $file"
-      failed_files="$failed_files $file"
+      echo "🔧 Adding trailing newline to: $file"
+      echo >> "$file"
     fi
   fi
 done
 
-if [ -n "$failed_files" ]; then
-  echo ""
-  echo "❌ Trailing newline check failed!"
-  echo "💡 Add trailing newlines to:$failed_files"
-  echo "🔧 Quick fix: for file in$failed_files; do echo >> \"\$file\"; done"
-  echo "🚫 Skip hook: git commit --no-verify"
-  exit 1
-fi
-
 echo "✅ All files have proper trailing newlines"

bin/lefthook/ruby-autofix

@@ -19,4 +19,4 @@ printf "  %s\n" $files
 
 bundle exec rake autofix
 
-echo "Completed auto-fixing all linting violations"
+echo "✅ Auto-fix complete (fixed files staged automatically)"