Load and save readline history in .cache/history (last 1000 entries). Co-Authored-By: Claude Sonnet 5.5 <noreply@anthropic.com>
Store it in .cache/last_model and restore it on startup, falling back to DEFAULT_MODEL if missing or unknown. Co-Authored-By: Claude Sonnet 5.5 <noreply@anthropic.com>
Co-Authored-By: Claude Sonnet 5.5 <noreply@anthropic.com>