fix(google): replay Gemini realtime tool result across session restart#6481
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When update_tools() restarts the Gemini Live websocket mid-turn, a function-tool result produced in that window was sent on the closing session and never replayed, so the model never received it and the turn hung. Buffer the tool result while the socket is restarting and replay it via send_tool_response once the new session is established, then nudge the model to continue the turn. Also decouple generation-completion handling from the model name so newer Live preview models work: track generation state explicitly via _generation_completed, drop trailing model_turn frames that arrive with no active generation, and allow generate_reply() for models without mutable_chat_context (gated on the capability, not a model-name literal). Fixes livekit#6479
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When update_tools() restarts the Gemini Live websocket mid-turn, a function-tool result produced in that window was sent on the closing session and never replayed, so the model never received it and the turn hung. Buffer the tool result while the socket is restarting and replay it via send_tool_response once the new session is established, then nudge the model to continue the turn.
Also decouple generation-completion handling from the model name so newer Live preview models work: track generation state explicitly via _generation_completed, drop trailing model_turn frames that arrive with no active generation, and allow generate_reply() for models without mutable_chat_context (gated on the capability, not a model-name literal). Fixes #6479