- Add real-time token usage and cost tracking from Claude Code responses
- New UsageStats type with tokens, cost, and context window
- Context window tooltip shows detailed token breakdown
- Cost displayed in main panel header and session list
- Improve input area UX with $ prefix for terminal mode
- Add Cmd+L shortcut to insert markdown checkbox in Scratchpad
- Add terminalOnly flag for slash commands (/jump is terminal-only)
- Disable LLM Settings panel behind feature flag (documented in BACKBURNER.md)
- Fix AgentSessionsBrowser to use layer stack for Escape handling
- Update README with cost tracking feature and keyboard shortcut
- Update CLAUDE.md with process:usage event and usageStats session field
