- Export `PaletteGroup` and `PaletteSuggestion` to represent suggestion metadata.
- Implement command history with deduplication, capacity limit, and recent‑command suggestions.
- Enhance dynamic suggestion logic to include history, commands, models, and providers with fuzzy ranking.
- Add UI rendering for grouped suggestions, header with command palette label, and footer instructions.
- Update help text with new shortcuts (Ctrl+P, layout save/load) and expose new agent/layout commands.