Fix instruction template modality rendering

[rosetta-livekit-bot]

Summary

• Collapse identical Instructions.tpl audio/text variants to a single audio-only representation.
• Preserve fully rendered modality-specific variants so renderInstructions(..., modality) does not duplicate template output.
• Add the source PR's instruction-template regression coverage adapted to the JS tagged-template API.

Source diff coverage

Source diff coverage

Source file	Classification	Target file	Notes
livekit-agents/livekit/agents/llm/chat_context.py	Ported	agents/src/llm/chat_context.ts	Ported the resolve_template behavior to the JS counterpart, Instructions.tpl. JS stores fully rendered audio/text variants plus a current value instead of Python's common plus modality suffixes, so the target change collapses identical rendered variants by omitting text when audio === text.
tests/test_chat_ctx.py	Ported	agents/src/llm/chat_context.test.ts	Ported the three source-added regression cases to Vitest using Instructions.tpl and renderInstructions, without adding unrelated new coverage.

Verification

• pnpm test -- agents/src/llm/chat_context.test.ts passes.
• pnpm build passes.
• pnpm lint passes, with existing warnings.
• pnpm test -- agents was run; it fails in existing AMD tests under agents/src/voice/amd.test.ts.
• pnpm test -- agents/src/voice/amd.test.ts reproduces the same AMD failures in isolation, confirming they are unrelated to this instruction-template port.

No source infrastructure gap was identified.

---

Ported from livekit/agents#6414

Original PR description

Fixes #6407

Cue voice E2E

• Strict voice-mode session: sid_7249cd3cd100 at head 3ff96430.
• Spoken input traversed STT and the changed modality-template path; the persisted predicate resolved on PR2030_VERIFIED common=1 audio=1 text=0, proving one common marker, one audio marker, and no text marker.
• TTS processed 145 characters and the session persisted framework events plus full-session and per-command WAV recordings under ~/.cue-cli/sessions/sid_7249cd3cd100/.

[changeset-bot]

🦋 Changeset detected

Latest commit: 3ff9643

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

This PR includes changesets to release 36 packages

Name	Type
@livekit/agents	Patch
@livekit/agents-plugin-anam	Patch
@livekit/agents-plugin-anthropic	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-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-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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[devin-ai-integration]

✅ Devin Review: No Issues Found

Devin Review analyzed this PR and found no bugs or issues to report.