cfab5caea3
The deep and artistry category fallback chains had no opencode-go provider entries, causing them to fall through to the ultimate fallback (opencode/gpt-5-nano) which is not available to opencode-go users. Add opencode-go entries: - deep: deepseek-v4-pro -> kimi-k2.6 -> glm-5.1 - artistry: kimi-k2.6 -> glm-5.1 Fixes #3924