Aider v0.81.0: New Quasar Model Support & OpenRouter Enhancements

Aider v0.81.0 introduces support for the openrouter/openrouter/quasar-alpha model, free on OpenRouter and scoring 55% on the polyglot coding benchmark. Enhancements to OpenRouter integration include OAuth authentication, preventing API call retries for insufficient credits, and improved error messages for connection issues. Configuration for specific Gemini 2.5 Pro models was also updated.