feat(inworld): add inworld-tts-2 model

[toubatbrian]

Summary

Ports livekit/agents#5646 ((inworld tts): add new model) from the Python livekit-agents repo into agents-js, exposing Inworld's new inworld-tts-2 model.

This is an automated Claude Code Routine port created by @toubatbrian.

cc @toubatbrian @livekit/agent-devs for review.

Ported features

1. New inworld-tts-2 model on the Inference Gateway TTS client. Adds 'inworld/inworld-tts-2' to the InworldModels literal union in agents/src/inference/tts.ts so callers using inference.TTS({ model: 'inworld/inworld-tts-2', ... }) get type-checked autocomplete and the value is accepted by the gateway-bound type.

2. TTSModels literal exported from @livekit/agents-plugin-inworld. Mirrors the new Python TTSModels = Literal["inworld-tts-2", "inworld-tts-1.5-max"] alias by exporting:

   export type TTSModels = 'inworld-tts-2' | 'inworld-tts-1.5-max';

   TTSOptions.model is now typed TTSModels | string (matching model: TTSModels | str in Python), preserving the freeform-string fallback so users can still pass any model id the Inworld API accepts while getting IDE autocomplete on the curated names.

Implementation notes / nuances vs. Python

• The Python plugin re-exports TTSModels from livekit/plugins/inworld/__init__.py. In the JS plugin, src/index.ts already does export * from './tts.js', so adding the new export type TTSModels in tts.ts is automatically re-exported from the package root — no additional change to index.ts needed.
• The Python PR also widens both __init__ and update_options signatures to TTSModels | str. In the JS plugin those argument types come transitively from TTSOptions['model'] (Partial<TTSOptions> in constructor / updateOptions), so widening the field type on the interface widens the constructor and updateOptions simultaneously — a single edit covers both call sites that the Python diff touches in two places.
• TS-level caveat: TTSModels | string widens to string in TypeScript, so the union is effectively documentation/IDE help, not a runtime constraint. We chose this form (over TTSModels | (string & {})) to stay consistent with how cartesia, minimax, google and neuphonic plugins already type their model field in this repo.
• No changes are needed to existing tests: plugins/inworld/src/tts.test.ts doesn't pin a model and the inference TTS tests don't reference the new literal. All 51 tests in agents/src/inference/tts.test.ts continue to pass.

Out-of-scope vs. Python diff

The Python PR also modifies livekit-plugins/livekit-plugins-inworld/livekit/plugins/inworld/__init__.py to export TTSModels alongside the other public symbols. The TS equivalent is automatic via export * from './tts.js' (see note above), so there is no analogous file edit on the JS side.

Changeset

patch bump for @livekit/agents-plugin-inworld and @livekit/agents (the latter because the public InworldModels union exported from agents/inference also gained a member).

Test plan

• pnpm --filter @livekit/agents build — passes
• pnpm --filter @livekit/agents-plugin-inworld build — passes
• pnpm --filter @livekit/agents-plugin-inworld lint — passes (clean)
• pnpm --filter @livekit/agents lint — passes (no new warnings)
• pnpm vitest run agents/src/inference/tts.test.ts — 51/51 pass
• Manual smoke test against the Inworld API with model: 'inworld-tts-2' (would require live INWORLD_API_KEY; deferred to human reviewer)

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[changeset-bot]

🦋 Changeset detected

Latest commit: ce04b81

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

This PR includes changesets to release 28 packages

Name	Type
@livekit/agents-plugin-inworld	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-elevenlabs	Patch
@livekit/agents-plugin-google	Patch
@livekit/agents-plugin-hedra	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-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-runway	Patch
@livekit/agents-plugin-sarvam	Patch
@livekit/agents-plugin-silero	Patch
@livekit/agents-plugins-test	Patch
@livekit/agents-plugin-trugen	Patch
@livekit/agents-plugin-xai	Patch

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[devin-ai-integration]

✅ Devin Review: No Issues Found

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