PR Summary

• Changed Model Name in Default Configuration
  The model name for chromedev profile in default.nix has been updated from "x-ai/grok-code-fast-1" to "x-ai/grok-4-fast". This represents an upgrade to a more advanced version of the model.

• Introduced New Model Configuration
  A new model configuration has been added in bender-muffin.nix. The model name has been changed to "free-muffin" and it comes with new parameters, including an API key and an increase in the maximum tokens limit to 128000.

• Updated Parameters for New Model
  The parameters for the free-muffin model in free-muffin.nix have been updated. The model has been changed to "openai/minimax-m2" with an adjusted API key, and the maximum tokens limit has been increased to 128000.

• Replaced Legacy References to New Integration
  All instances of "tavily*" have been replaced with "brightdata*" in mcp.nix and opencode-config.nix, representing a transition to a new data service integration, namely brightdata.

• Changed Model in OpenCode Config
  In opencode-config.nix, the model has been changed from "litellm/bender-muffin" to "litellm/free-muffin", indicating another update in the utilized models.

• Added New Entry for Model in OpenCode Config
  A new entry for the free-muffin model has been added to the models section of opencode-config.nix alongside its ID and name. This includes the new model into the list of models to be used in this configuration.