>
> This commit audits the Groq worker and makes the following changes:
>
> - Adds a circuit breaker to the think_once() method to prevent it from running too frequently if there are no new perceptions.
> - Makes the model and Ollama URL configurable via command-line arguments.
> - Adds a new nexus/groq_worker.py module to handle the Groq API interaction.
> - Modifies nexus/nexus_think.py to use the GroqWorker.
> - Adds a section to the README.md file with a recommendation to use a Groq model for PR reviews.
>
> Refs #451
