epic: Optimize Claude Code for autonomous slash command workflow

## Epic Overview
Transform Claude Code workflow to be slash command-centric with minimal manual intervention, enabling true hands-off keyboard operation.

## Vision
- Slash commands as the heart of development workflow
- Autonomous operation without constant approval prompts
- Clear notifications when work completes
- Focus on high-level issue creation, not implementation details
- Data-driven optimization based on usage patterns

## Key Outcomes
1. **Reduced Friction**: No more permission prompts for trivial operations
2. **Better Visibility**: Track and optimize command usage
3. **Reliable Notifications**: Know when Claude completes work
4. **Flexible Permissions**: Context-aware tool access
5. **Personal Productivity**: Hands-off keyboard for strategic work

## Implementation Issues

### 🚨 High Priority (Snowball Method)
- #593 - Auto-approve trivial permissions [**BLOCKER**]
- #591 - Add "think" triggers to slash commands

### Core Functionality
- #594 - Track slash command usage analytics
- #595 - Fix completion notifications
- #596 - Implement tool permission system (local/project/global)
- #598 - Research /retro vs close-issue taxonomy

### Documentation
- #597 - Add hands-off keyboard philosophy to README

## Success Metrics
- Zero permission prompts for read operations
- All slash commands have appropriate think levels
- Usage tracking shows command patterns
- Notifications work reliably
- Can leave Claude running autonomously

## Tracking
- Created from: #592 (analysis task)
- Principle: selective-optimization, systems-stewardship

## Next Steps
1. Tackle #593 first (highest impact on all other work)
2. Research #598 to understand current commands
3. Implement remaining features in parallel

Start by reviewing the linked work items #593, #591, #594, #595, #596, #598, and #597, then compare them with the parent analysis task #592. Done means the listed success metrics are met: fewer read-operation prompts, appropriate think levels, usage tracking, reliable notifications, and autonomous operation.

Written by the indexing model from the issue text.