fix(phonic): reuse realtime session across handoffs

[rosetta-livekit-bot]

Summary

• reuse the existing Phonic realtime websocket across agent handoffs via mid-session reset
• share config/tool payload construction between initial config and reset
• close any active generation before replacing handoff chat context

Testing

• pnpm --filter @livekit/agents build
• pnpm --filter @livekit/agents-plugin-phonic build
• pnpm exec prettier --check "plugins/phonic/src/realtime/realtime_model.ts" ".changeset/reuse-phonic-handoff-ws.md"

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Ported from livekit/agents#6163

Original PR description

already supported in JS

[changeset-bot]

🦋 Changeset detected

Latest commit: 4f2eea2

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

This PR includes changesets to release 35 packages

Name	Type
@livekit/agents-plugin-phonic	Patch
@livekit/agents	Patch
@livekit/agents-plugin-anam	Patch
@livekit/agents-plugin-assemblyai	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-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-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-plugin-trugen	Patch
@livekit/agents-plugin-xai	Patch
@livekit/agents-plugins-test	Patch

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[devin-ai-integration]

Devin Review found 1 potential issue.

[devin-ai-integration]

🚩 Conditional tools field omission changes reset semantics

In the new buildConfigOptions at line 860, tools is only included when toolsPayload.length > 0. The old code always sent tools (even as []) in both the initial config and reset messages. This is a semantic change: when an agent with no tools takes over during a handoff, the reset config will omit the tools field entirely rather than sending tools: []. Whether this correctly clears old tools depends on how the Phonic server interprets a reset with a missing tools field — as "no tools" (full replacement) vs "keep existing tools" (partial update). Since the message type is reset and the config includes all other fields unconditionally, full replacement seems intended, but this should be verified against the Phonic API docs.

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