- Add /compact command for manual context compaction with optional custom instructions
- Add /autocompact command to toggle automatic compaction
- Auto-trigger compaction when context usage exceeds threshold (contextWindow - reserveTokens)
- Add CompactionComponent for TUI display with collapsed/expanded states
- Add compaction events to HTML export with collapsible summary
- Refactor export-html.ts to eliminate duplication between session and streaming formats
- Use setTimeout to break out of agent event handler for safe async compaction
- Show compaction summary in TUI after compaction completes
fixes#92
