fix(voice): preserve tool responses on early exits

[swayamg20]

Summary

• return an error function response when a model emits a tool call while toolChoice is set to none, without executing the tool
• commit completed regular tool outputs and flush them to the realtime provider before interrupted generations exit, so pending call IDs do not remain unresolved
• add regression coverage for both early-exit paths

Fixes #2249

Validation

• pnpm exec vitest run agents/src/voice/generation_tools.test.ts agents/src/voice/realtime_tool_output_commit.test.ts agents/src/voice/agent_activity.test.ts — 59 passed
• pnpm exec vitest run agents/src — 115 files passed; 1,590 tests passed, 5 skipped
• pnpm --filter @livekit/agents typecheck
• pnpm --filter @livekit/agents build
• pnpm -w lint:fix — all 40 packages passed with 145 existing warnings
• pnpm -w format:check
• git diff --check

[changeset-bot]

🦋 Changeset detected

Latest commit: d7be9c2

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

This PR includes changesets to release 39 packages

Name	Type
@livekit/agents	Patch
@livekit/agents-plugin-anam	Patch
@livekit/agents-plugin-anthropic	Patch
@livekit/agents-plugin-assemblyai	Patch
@livekit/agents-plugin-azure	Patch
@livekit/agents-plugin-baseten	Patch
@livekit/agents-plugin-bey	Patch
@livekit/agents-plugin-cartesia	Patch
@livekit/agents-plugin-cerebras	Patch
@livekit/agents-plugin-deepgram	Patch
@livekit/agents-plugin-did	Patch
@livekit/agents-plugin-elevenlabs	Patch
@livekit/agents-plugin-fishaudio	Patch
@livekit/agents-plugin-google	Patch
@livekit/agents-plugin-hedra	Patch
@livekit/agents-plugin-hume	Patch
@livekit/agents-plugin-inworld	Patch
@livekit/agents-plugin-krisp	Patch
@livekit/agents-plugin-lemonslice	Patch
@livekit/agents-plugin-liveavatar	Patch
@livekit/agents-plugin-livekit	Patch
@livekit/agents-plugin-minimax	Patch
@livekit/agents-plugin-mistral	Patch
@livekit/agents-plugin-mistralai	Patch
@livekit/agents-plugin-neuphonic	Patch
@livekit/agents-plugin-openai	Patch
@livekit/agents-plugin-perplexity	Patch
@livekit/agents-plugin-phonic	Patch
@livekit/agents-plugin-protoface	Patch
@livekit/agents-plugin-resemble	Patch
@livekit/agents-plugin-rime	Patch
@livekit/agents-plugin-runway	Patch
@livekit/agents-plugin-sarvam	Patch
@livekit/agents-plugin-silero	Patch
@livekit/agents-plugin-soniox	Patch
@livekit/agents-plugin-tavus	Patch
@livekit/agents-plugins-test	Patch
@livekit/agents-plugin-trugen	Patch
@livekit/agents-plugin-xai	Patch

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