feat: Add Sequential Thinking to Code Review + Frontend Validation

Enhanced code review and frontend validation with intelligent triggers:

Code Review Agent Enhancement:
- Added Sequential Thinking MCP integration for complex issues
- Triggers on 2+ rejections or 3+ critical issues
- New escalation format with root cause analysis
- Comprehensive solution strategies with trade-off evaluation
- Educational feedback to break rejection cycles
- Files: .claude/agents/code-review.md (+308 lines)
- Docs: CODE_REVIEW_ST_ENHANCEMENT.md, CODE_REVIEW_ST_TESTING.md

Frontend Design Skill Enhancement:
- Automatic invocation for ANY UI change
- Comprehensive validation checklist (200+ checkpoints)
- 8 validation categories (visual, interactive, responsive, a11y, etc.)
- 3 validation levels (quick, standard, comprehensive)
- Integration with code review workflow
- Files: .claude/skills/frontend-design/SKILL.md (+120 lines)
- Docs: UI_VALIDATION_CHECKLIST.md (462 lines), AUTOMATIC_VALIDATION_ENHANCEMENT.md (587 lines)

Settings Optimization:
- Repaired .claude/settings.local.json (fixed m365 pattern)
- Reduced permissions from 49 to 33 (33% reduction)
- Removed duplicates, sorted alphabetically
- Created SETTINGS_PERMISSIONS.md documentation

Checkpoint Command Enhancement:
- Dual checkpoint system (git + database)
- Saves session context to API for cross-machine recall
- Includes git metadata in database context
- Files: .claude/commands/checkpoint.md (+139 lines)

Decision Rationale:
- Sequential Thinking MCP breaks rejection cycles by identifying root causes
- Automatic frontend validation catches UI issues before code review
- Dual checkpoints enable complete project memory across machines
- Settings optimization improves maintainability

Total: 1,200+ lines of documentation and enhancements

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

scripts/setup-mcp-servers.sh

@@ -0,0 +1,120 @@
+#!/bin/bash
+# Setup MCP Servers for ClaudeTools
+# This script helps configure MCP servers for Claude Code
+
+set -e
+
+SCRIPT_DIR="$(cd "$(dirname "${BASH_SOURCE[0]}")" && pwd)"
+PROJECT_ROOT="$(dirname "$SCRIPT_DIR")"
+MCP_CONFIG="$PROJECT_ROOT/.mcp.json"
+MCP_EXAMPLE="$PROJECT_ROOT/.mcp.json.example"
+
+echo "[INFO] MCP Server Setup Script"
+echo "[INFO] Project Root: $PROJECT_ROOT"
+echo ""
+
+# Check if Node.js is installed
+if ! command -v node &> /dev/null; then
+    echo "[ERROR] Node.js is not installed"
+    echo "[INFO] Please install Node.js from https://nodejs.org/"
+    exit 1
+fi
+
+NODE_VERSION=$(node --version)
+echo "[OK] Node.js installed: $NODE_VERSION"
+
+# Check if npx is available
+if ! command -v npx &> /dev/null; then
+    echo "[ERROR] npx is not available"
+    echo "[INFO] Please ensure npm is installed correctly"
+    exit 1
+fi
+
+echo "[OK] npx is available"
+echo ""
+
+# Check if .mcp.json exists
+if [ -f "$MCP_CONFIG" ]; then
+    echo "[INFO] MCP configuration already exists: $MCP_CONFIG"
+    read -p "Do you want to overwrite it? (y/N): " -n 1 -r
+    echo
+    if [[ ! $REPLY =~ ^[Yy]$ ]]; then
+        echo "[INFO] Keeping existing configuration"
+        exit 0
+    fi
+fi
+
+# Copy example configuration
+if [ ! -f "$MCP_EXAMPLE" ]; then
+    echo "[ERROR] Example configuration not found: $MCP_EXAMPLE"
+    exit 1
+fi
+
+cp "$MCP_EXAMPLE" "$MCP_CONFIG"
+echo "[OK] Created MCP configuration from template"
+
+# Prompt for GitHub token
+echo ""
+echo "[SETUP] GitHub MCP Server Configuration"
+echo "[INFO] You need a GitHub Personal Access Token to use the GitHub MCP server"
+echo "[INFO] Generate one at: https://github.com/settings/tokens"
+echo "[INFO] Required scopes: repo, workflow, read:org, read:user"
+echo ""
+read -p "Enter your GitHub Personal Access Token (or press Enter to skip): " GITHUB_TOKEN
+
+if [ -n "$GITHUB_TOKEN" ]; then
+    # Update token in configuration (cross-platform sed)
+    if [[ "$OSTYPE" == "darwin"* ]]; then
+        # macOS
+        sed -i '' "s/YOUR_GITHUB_TOKEN_HERE/$GITHUB_TOKEN/g" "$MCP_CONFIG"
+    else
+        # Linux/Git Bash
+        sed -i "s/YOUR_GITHUB_TOKEN_HERE/$GITHUB_TOKEN/g" "$MCP_CONFIG"
+    fi
+    echo "[OK] GitHub token configured"
+else
+    echo "[WARNING] GitHub MCP server will not work without a token"
+    echo "[INFO] You can add it later by editing $MCP_CONFIG"
+fi
+
+# Test MCP server packages
+echo ""
+echo "[TEST] Verifying MCP server packages..."
+
+echo "[TEST] Testing Sequential Thinking MCP server..."
+if npx -y @modelcontextprotocol/server-sequential-thinking --version &> /dev/null; then
+    echo "[OK] Sequential Thinking MCP server is available"
+else
+    echo "[WARNING] Sequential Thinking MCP server test failed (may work anyway)"
+fi
+
+echo "[TEST] Testing Filesystem MCP server..."
+if npx -y @modelcontextprotocol/server-filesystem --help &> /dev/null; then
+    echo "[OK] Filesystem MCP server is available"
+else
+    echo "[WARNING] Filesystem MCP server test failed (may work anyway)"
+fi
+
+if [ -n "$GITHUB_TOKEN" ]; then
+    echo "[TEST] Testing GitHub MCP server..."
+    if npx -y @modelcontextprotocol/server-github --version &> /dev/null; then
+        echo "[OK] GitHub MCP server is available"
+    else
+        echo "[WARNING] GitHub MCP server test failed (may work anyway)"
+    fi
+fi
+
+echo ""
+echo "[SUCCESS] MCP servers configured successfully!"
+echo ""
+echo "[NEXT STEPS]"
+echo "1. Restart Claude Code completely (quit and relaunch)"
+echo "2. Open the ClaudeTools project in Claude Code"
+echo "3. Test MCP servers:"
+echo "   - Sequential Thinking: Ask Claude to 'use sequential thinking to analyze X'"
+echo "   - Filesystem: Ask Claude to 'list Python files in the api directory'"
+echo "   - GitHub: Ask Claude to 'list my recent GitHub repositories'"
+echo ""
+echo "[DOCUMENTATION]"
+echo "See D:\\ClaudeTools\\MCP_SERVERS.md for complete documentation"
+echo ""