feat: implement comprehensive Build Architecture Guard system

- Add Husky Git hooks for pre-commit and pre-push validation
- Create guard script for BUILDING.md update enforcement
- Implement PR template with L1/L2/L3 change classification
- Add markdown validation and auto-fix scripts
- Create comprehensive documentation and MDC rules
- Ensure zero-disruption deployment with opt-in activation

.cursor/rules/docs/markdown-automation.mdc

@@ -0,0 +1,79 @@
+---
+alwaysApply: true
+---
+
+# Markdown Automation System
+
+**Author**: Matthew Raymer
+**Date**: 2025-08-20
+**Status**: 🎯 **ACTIVE** - Markdown formatting automation
+
+## Overview
+
+The Markdown Automation System ensures your markdown formatting standards are
+followed **during content generation** by AI agents, not just applied after the
+fact.
+
+## AI-First Approach
+
+### **Primary Method**: AI Agent Compliance
+
+- **AI agents follow markdown rules** while generating content
+- **No post-generation fixes needed** - content is compliant from creation
+- **Consistent formatting** across all generated documentation
+
+### **Secondary Method**: Automated Validation
+
+- **Pre-commit hooks** catch any remaining issues
+- **GitHub Actions** validate formatting before merge
+- **Manual tools** for bulk fixes when needed
+
+## How It Works
+
+### 1. **AI Agent Compliance** (Primary)
+
+- **When**: Every time AI generates markdown content
+- **What**: AI follows markdown rules during generation
+- **Result**: Content is properly formatted from creation
+
+### 2. **Pre-commit Hooks** (Backup)
+
+- **When**: Every time you commit
+- **What**: Catches any remaining formatting issues
+- **Result**: Clean, properly formatted markdown files
+
+### 3. **GitHub Actions** (Pre-merge)
+
+- **When**: Every pull request
+- **What**: Validates markdown formatting across all files
+- **Result**: Blocks merge if formatting issues exist
+
+## AI Agent Rules Integration
+
+The AI agent follows markdown rules defined in `.cursor/rules/docs/markdown.mdc`:
+
+- **alwaysApply: true** - Rules are enforced during generation
+- **Line Length**: AI never generates lines > 80 characters
+- **Blank Lines**: AI adds proper spacing around all elements
+- **Structure**: AI uses established templates and patterns
+
+## Available Commands
+
+### NPM Scripts
+
+- **`npm run markdown:setup`** - Install the automation system
+- **`npm run markdown:fix`** - Fix formatting in all markdown files
+- **`npm run markdown:check`** - Validate formatting without fixing
+
+## Benefits
+
+- **No more manual fixes** - AI generates compliant content from start
+- **Consistent style** - All files follow same standards
+- **Faster development** - No need to fix formatting manually
+
+---
+
+**Status**: Active automation system
+**Priority**: High
+**Maintainer**: Development team
+**Next Review**: 2025-09-20