- Add ContextTracker class for accurate token estimation
- Track input/output token breakdown
- Calculate burn rate (tokens/minute)
- Add compaction warnings at 85% threshold
- Update ContextMeter to display health status, burn rate, and breakdown
- Add ContextHealth and ContextBreakdown types
🤖 Generated with [Claude Code](https://claude.com/claude-code)
Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>