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* realtime: honor output_modalities to skip TTS in text-only mode The emulated realtime pipeline previously ignored the OpenAI Realtime spec field output_modalities and always synthesized TTS. Add resolveOutputModalities + modalitiesContainAudio helpers and gate the TTS / ResponseOutputAudio* emission so a client requesting ["text"] gets only ResponseOutputText* events. This lets thin clients (e.g. thing5-poc) cache TTS on the client side while still using the realtime WS for VAD + STT + LLM + tool-call parsing. Assisted-by: Claude:claude-opus-4-7 * realtime: plumb response-level output_modalities and echo on session Follow-up to the previous commit: - Resolve response.create's output_modalities at the gate so a per-response override of an audio session is honored (the test asserted this contract but the production call site was passing nil). - Mirror OutputModalities in the RealtimeSession echo so session.update round-trips the client-supplied value, matching MaxOutputTokens's pattern. Assisted-by: Claude:claude-opus-4-7 * realtime: silence errcheck on deferred os.Remove of TTS file CI's errcheck flagged the pre-existing `defer os.Remove(audioFilePath)` inside the audio-emission block (now wrapped by the modality gate). Wrap the call in a closure that explicitly discards the error — the canonical Go pattern for "I want to defer a cleanup whose error I genuinely don't care about." Assisted-by: Claude:claude-opus-4-7 golangci-lint --------- Co-authored-by: Ettore Di Giacinto <mudler@localai.io>