Hold a function call until the user's turn is confirmed

Deepgram's Voice Agent API can now hold a function call until a user's turn is confirmed, instead of dispatching it the moment the LLM emits it. Agent audio has always waited for speech-to-text to confirm the user has stopped talking; function calls did not, so an irreversible action like ending a call or booking an appointment could fire during a turn the user then continued.

• Adding defer_until_eot: true to a function in agent.think.functions holds that call until the turn is confirmed. If the user keeps speaking and the turn resumes, the call is discarded before it runs. The default is false, so existing agents are unchanged, and deferring one function does not delay others in the same turn. It works with every listen provider, not just Flux.
• Clients now receive a FunctionCallCancelled event when a client-side function call they already received is cancelled, whether the user resumed speaking inside the speculative window or barged in after the turn was confirmed. Clients should stop work on that call's id and send no FunctionCallResponse for it.

Full details are in Deepgram's turn confirmation documentation.

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