Update Perplexity Responses default model

[rosetta-livekit-bot]

https://docs.perplexity.ai/docs/agent-api/models#available-models

[changeset-bot]

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Latest commit: 97195b7

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[devin-ai-integration]

✅ Devin Review: No Issues Found

Devin Review analyzed this PR and found no potential bugs to report.

View in Devin Review to see 1 additional finding.

[devin-ai-integration]

Devin Review found 1 new potential issue.

⚠️ 1 issue in files not directly in the diff

⚠️ README example for responses.LLM still shows old sonar-pro model after default changed to perplexity/sonar (plugins/perplexity/README.md:43)

The PR changes the default model for responses.LLM from 'sonar-pro' to 'perplexity/sonar' (in plugins/perplexity/src/responses/llm.ts:33) and introduces a dedicated PerplexityResponsesModels type for it, but the README's "Agent API usage" example at plugins/perplexity/README.md:43 still shows model: 'sonar-pro'. This is misleading — users copying the example will pass an outdated model name. While 'sonar-pro' still compiles (it satisfies the string union arm), it no longer matches the typed PerplexityResponsesModels literal and may not be a valid model for Perplexity's Responses/Agent API.

View 2 additional findings in Devin Review.