fix Twilio handoff audio format

[dkundel-openai]

Summary

• keep g711 format when updating Twilio sessions
• test that updateSessionConfig preserves Twilio audio settings

Testing

• pnpm build
• pnpm test
• pnpm lint

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https://chatgpt.com/codex/tasks/task_i_685375c694108331bd25bad0e004f0d2

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Latest commit: 702cb94

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[dkundel-openai]

Have to verify this fix still.

[github-actions]

This PR is stale because it has been open for 10 days with no activity.