• Added newly released Claude Sonnet 4 and Claude Opus 4 as built-in models.
• Sonnet 4 isn't yet used in the default 'daily-driver' model pack due to sporadic errors in early testing, but it can be used with the 'sonnet-4-daily' model pack (use '\set-model sonnet-4-daily' to use it). It will be promoted to the default model pack soon.
• Opus 4 can be used with the 'opus-4-planner' model pack ( '\set-model opus-4-planner'), which uses Opus 4 for planning and Sonnet 4 for coding.
• Removed error fallbacks for o4-mini and gemini-2.5-pro-preview.