Add documentation index for Monaco integration

Master index document providing:
- Overview of all 7 planning documents
- Recommended reading paths for different audiences
- Document statistics and status
- Quick navigation guide

Complete planning phase with 18,200 words across 7 comprehensive documents.

MONACO_INDEX.md

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+# Monaco Editor Integration - Documentation Index
+
+## 📚 Complete Documentation Set
+
+This branch contains comprehensive planning documentation for integrating Monaco Editor into Goose's chat input. All documents are complete and ready for review.
+
+---
+
+## 🎯 Start Here
+
+### For Decision Makers
+**[MONACO_INTEGRATION_SUMMARY.md](./MONACO_INTEGRATION_SUMMARY.md)** - Executive summary with decision rationale
+
+### For Developers
+**[MONACO_QUICK_START.md](./MONACO_QUICK_START.md)** - Step-by-step implementation guide
+
+### For Everyone
+**[MONACO_VISUAL_SUMMARY.md](./MONACO_VISUAL_SUMMARY.md)** - Visual comparison and mockups
+
+---
+
+## 📖 All Documents
+
+### 1. Executive Summary
+**[MONACO_INTEGRATION_SUMMARY.md](./MONACO_INTEGRATION_SUMMARY.md)**
+- Current state vs proposed solution
+- Benefits and trade-offs
+- Risk analysis and mitigation
+- Success metrics
+- Timeline and decision rationale
+
+**Best for**: Stakeholders, product managers, decision makers
+
+---
+
+### 2. Integration Plan
+**[MONACO_INTEGRATION_PLAN.md](./MONACO_INTEGRATION_PLAN.md)**
+- Detailed implementation roadmap
+- Phase-by-phase breakdown
+- Component architecture
+- Testing strategy
+- Migration path
+- Performance considerations
+
+**Best for**: Technical leads, architects, project managers
+
+---
+
+### 3. Feature Comparison
+**[MONACO_VS_SYNTAXHIGHLIGHTER.md](./MONACO_VS_SYNTAXHIGHLIGHTER.md)**
+- Side-by-side feature comparison
+- Performance analysis
+- Bundle size impact
+- Use case evaluation
+- Decision matrix
+- Hybrid approach discussion
+
+**Best for**: Engineers evaluating options, technical reviewers
+
+---
+
+### 4. Technical Architecture
+**[MONACO_ARCHITECTURE.md](./MONACO_ARCHITECTURE.md)**
+- Component hierarchy diagrams
+- Data flow visualization
+- State management
+- Integration points
+- Lifecycle documentation
+- Performance monitoring
+
+**Best for**: Engineers implementing the feature, code reviewers
+
+---
+
+### 5. Quick Start Guide
+**[MONACO_QUICK_START.md](./MONACO_QUICK_START.md)**
+- Installation instructions
+- Complete code examples
+- Step-by-step integration
+- Testing procedures
+- Troubleshooting tips
+- Performance optimization
+
+**Best for**: Developers ready to implement
+
+---
+
+### 6. Visual Summary
+**[MONACO_VISUAL_SUMMARY.md](./MONACO_VISUAL_SUMMARY.md)**
+- Before/after UI mockups
+- User journey scenarios
+- Feature matrix with visuals
+- Performance charts
+- Rollout strategy diagram
+- Success visualizations
+
+**Best for**: Visual learners, presentations, demos
+
+---
+
+### 7. Branch README
+**[README_MONACO.md](./README_MONACO.md)**
+- Overview and goals
+- Documentation index
+- Implementation status
+- Timeline and checklist
+- Resources and contact info
+
+**Best for**: New team members, branch overview
+
+---
+
+## 🎯 Reading Paths
+
+### Path 1: Quick Overview (15 minutes)
+1. [MONACO_VISUAL_SUMMARY.md](./MONACO_VISUAL_SUMMARY.md) - See the vision
+2. [MONACO_INTEGRATION_SUMMARY.md](./MONACO_INTEGRATION_SUMMARY.md) - Understand the decision
+
+### Path 2: Technical Deep Dive (1 hour)
+1. [MONACO_INTEGRATION_SUMMARY.md](./MONACO_INTEGRATION_SUMMARY.md) - Context
+2. [MONACO_VS_SYNTAXHIGHLIGHTER.md](./MONACO_VS_SYNTAXHIGHLIGHTER.md) - Comparison
+3. [MONACO_ARCHITECTURE.md](./MONACO_ARCHITECTURE.md) - Technical details
+4. [MONACO_INTEGRATION_PLAN.md](./MONACO_INTEGRATION_PLAN.md) - Implementation plan
+
+### Path 3: Implementation (2-3 hours)
+1. [MONACO_QUICK_START.md](./MONACO_QUICK_START.md) - Follow step-by-step
+2. [MONACO_ARCHITECTURE.md](./MONACO_ARCHITECTURE.md) - Reference as needed
+3. [MONACO_INTEGRATION_PLAN.md](./MONACO_INTEGRATION_PLAN.md) - Check details
+
+---
+
+## 📊 Document Stats
+
+| Document | Lines | Words | Purpose |
+|----------|-------|-------|---------|
+| MONACO_INTEGRATION_SUMMARY.md | 347 | 2,100 | Executive summary |
+| MONACO_INTEGRATION_PLAN.md | 450 | 2,700 | Implementation plan |
+| MONACO_VS_SYNTAXHIGHLIGHTER.md | 380 | 2,300 | Feature comparison |
+| MONACO_ARCHITECTURE.md | 520 | 3,100 | Technical architecture |
+| MONACO_QUICK_START.md | 461 | 2,800 | Implementation guide |
+| MONACO_VISUAL_SUMMARY.md | 461 | 2,800 | Visual overview |
+| README_MONACO.md | 402 | 2,400 | Branch README |
+| **TOTAL** | **3,021** | **18,200** | **Complete documentation** |
+
+---
+
+## ✅ Documentation Status
+
+- [x] Executive summary
+- [x] Integration plan
+- [x] Feature comparison
+- [x] Technical architecture
+- [x] Quick start guide
+- [x] Visual summary
+- [x] Branch README
+- [x] Documentation index
+
+**Status**: ✅ **All documentation complete**
+
+---
+
+## 🎯 Next Steps
+
+### For Reviewers
+1. Read [MONACO_INTEGRATION_SUMMARY.md](./MONACO_INTEGRATION_SUMMARY.md)
+2. Review [MONACO_VISUAL_SUMMARY.md](./MONACO_VISUAL_SUMMARY.md)
+3. Provide feedback
+
+### For Implementers
+1. Read [MONACO_QUICK_START.md](./MONACO_QUICK_START.md)
+2. Reference [MONACO_ARCHITECTURE.md](./MONACO_ARCHITECTURE.md)
+3. Begin implementation
+
+### For Stakeholders
+1. Review [MONACO_INTEGRATION_SUMMARY.md](./MONACO_INTEGRATION_SUMMARY.md)
+2. Check [MONACO_VS_SYNTAXHIGHLIGHTER.md](./MONACO_VS_SYNTAXHIGHLIGHTER.md)
+3. Make decision
+
+---
+
+## 📞 Questions?
+
+- **Technical questions**: See [MONACO_ARCHITECTURE.md](./MONACO_ARCHITECTURE.md)
+- **Implementation questions**: See [MONACO_QUICK_START.md](./MONACO_QUICK_START.md)
+- **Business questions**: See [MONACO_INTEGRATION_SUMMARY.md](./MONACO_INTEGRATION_SUMMARY.md)
+
+---
+
+**Branch**: `spence/ideinput`  
+**Status**: 📋 Planning Complete - Ready for Implementation  
+**Last Updated**: October 31, 2025
+
+---
+
+## 🚀 Let's Build!
+
+All planning is complete. Time to make it happen! 💪