fix(google): add Gemini 3.1 Flash Live compatibility

[swayamg20]

Problem

Two things were broken when using gemini-3.1-flash-live-preview with the Live API:

1. pushAudio() was sending mediaChunks (deprecated) Gemini 3.1 requires the audio field directly.
2. generateReply() was using sendClientContent to trigger generation, Gemini 3.1 rejects this with "Request contains an invalid argument."

Additionally, empty tools and sessionResumption fields were being sent in session setup even when unpopulated, causing rejections on stricter model versions.

Changes

• Replace mediaChunks with audio field in pushAudio() and all related event handling
• Replace sendClientContent with sendRealtimeInput({ text }) in generateReply() — works across all Live API models
• Only include tools in session config when there are actual declarations
• Only include sessionResumption when a handle exists
• Add gemini-3.1-flash-live-preview to LiveAPIModels type

Testing

Tested against gemini-3.1-flash-live-preview audio streaming and reply generation both work correctly.

Closes #1179

[changeset-bot]

🦋 Changeset detected

Latest commit: 0c40602

The changes in this PR will be included in the next version bump.

This PR includes changesets to release 22 packages

Name	Type
@livekit/agents-plugin-google	Patch
@livekit/agents	Patch
@livekit/agents-plugin-anam	Patch
@livekit/agents-plugin-baseten	Patch
@livekit/agents-plugin-bey	Patch
@livekit/agents-plugin-cartesia	Patch
@livekit/agents-plugin-deepgram	Patch
@livekit/agents-plugin-elevenlabs	Patch
@livekit/agents-plugin-hedra	Patch
@livekit/agents-plugin-inworld	Patch
@livekit/agents-plugin-lemonslice	Patch
@livekit/agents-plugin-livekit	Patch
@livekit/agents-plugin-neuphonic	Patch
@livekit/agents-plugin-openai	Patch
@livekit/agents-plugin-phonic	Patch
@livekit/agents-plugin-resemble	Patch
@livekit/agents-plugin-rime	Patch
@livekit/agents-plugin-sarvam	Patch
@livekit/agents-plugin-silero	Patch
@livekit/agents-plugin-trugen	Patch
@livekit/agents-plugin-xai	Patch
@livekit/agents-plugins-test	Patch

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[CLAassistant]

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[toubatbrian]

Thanks for the work here. I’m taking over this effort in a follow-up PR: #1189.

Given the discussion and outcome in Python, we should hold off on the generateReply workaround for Gemini 3.1 until we have a proper upstream direction from the Gemini team. Reference: livekit/agents#5251.

So the current plan is to defer full Gemini 3.1 generateReply behavior changes until there is an official fix/guidance.