Merge branch 'main' into filipi/includes_inter_frame_spaces

# Conflicts:
#	uv.lock

changelog/4270.changed.md

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+- Updated `NvidiaLLMService` to emit model reasoning as `LLMThought*Frame`s (from both `reasoning_content` and `<think>...</think>` output), avoid mixing reasoning text into normal assistant content, and allow keyless local NIM endpoints while warning when the cloud endpoint is used without an API key.

changelog/4320.fixed.md

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+- Fixed `SmallestTTSService` WebSocket endpoint URL to match Smallest AI v4.0.0 API (`wss://waves-api.smallest.ai` → `wss://api.smallest.ai`) and restored keepalive using a silent space message instead of the unsupported flush command.

changelog/4323.fixed.md

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+- Fixed whitespace handling in TTS token streaming mode. Inter-token whitespace (e.g., spaces between words) is now preserved for correct prosody, while leading whitespace before the first non-whitespace token is still stripped to avoid issues with TTS models that are sensitive to leading spaces.

changelog/4324.added.md

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+- Added incremental `pyright` type checking. A `pyrightconfig.json` at the repo root uses `typeCheckingMode: "basic"` with an explicit `include` list of modules that pass cleanly (`clocks`, `metrics`, `transcriptions`, `frames`, `observers`, `extensions`, `turns`, `pipeline`, `runner`). Remaining modules will be added in subsequent PRs. CI enforces the checked set via `uv run pyright` in the format workflow.

changelog/4324.changed.md

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+- `LiveKitRunnerArguments.token` is now a required `str` (previously `str | None` with a default of `None`). LiveKit requires a token to join a room, so the type now reflects reality. This only affects custom runners that construct `LiveKitRunnerArguments` directly; code consuming the argument from the standard runner is unaffected.

changelog/4325.fixed.md

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+- Fixed `SentryMetrics` silently dropping `MetricsFrame`s from `stop_ttfb_metrics` and `stop_processing_metrics`. `SentryMetrics` called the base `FrameProcessorMetrics` implementation but discarded its return value, so `FrameProcessor` never pushed the `MetricsFrame` downstream. This prevented observers (e.g. `UserBotLatencyObserver`, `MetricsLogObserver`) from seeing TTFB and processing metrics for any service using `metrics=SentryMetrics()`. The metrics were still calculated and Sentry transactions still completed — only the downstream frame push was affected.

changelog/4326.added.md

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+- Added multilingual support to `DeepgramFluxSTTService` via a new `language_hints: list[Language]` setting. Works with Deepgram's new `flux-general-multi` model to bias transcription across English, Spanish, French, German, Hindi, Russian, Portuguese, Japanese, Italian, and Dutch. Omit the hints to use auto-detection, or pass a subset to bias toward expected languages. Hints can be updated mid-stream via `STTUpdateSettingsFrame` (sent as a Deepgram `Configure` control message, no reconnect) to support detect-then-lock flows.

changelog/4326.changed.md

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+- `TranscriptionFrame.language` and `InterimTranscriptionFrame.language` emitted by `DeepgramFluxSTTService` now reflect the language Deepgram detected for each turn (read from the `languages` field on Flux's `TurnInfo` event). On `flux-general-multi` this gives per-turn accuracy for downstream consumers (e.g. TTS voice selection). `flux-general-en` continues to emit `Language.EN`.

changelog/4334.added.md

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+- Added fine-grained server-side VAD tuning options to `SarvamSTTService.Settings` for the `saaras:v3` model, including speech thresholds, frame-count controls, pre-speech padding, interruption sensitivity, and initial-frame skipping.

changelog/4334.changed.md

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+- `SarvamSTTService` now uses `saaras:v3` as its default model instead of `saarika:v2.5`. Applications that relied on the previous default should set `settings=SarvamSTTService.Settings(model="saarika:v2.5")` explicitly.

changelog/4337.changed.2.md

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+- `SpeechTimeoutUserTurnStopStrategy` now waits only `user_speech_timeout` when a transcript arrives without a VAD stop event, rather than `max(ttfs_p99_latency, user_speech_timeout)`. If you had `ttfs_p99_latency > user_speech_timeout`, turn detection in that path is slightly faster than before.

changelog/4337.changed.md

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+- If you use an STT service that emits finalized transcripts (Speechmatics, Soniox, Deepgram Flux, AssemblyAI) with `SpeechTimeoutUserTurnStopStrategy`, user turns now end as soon as `user_speech_timeout` elapses after VAD stop. Previously the strategy also waited for the STT P99 latency (`ttfs_p99_latency`) even when the transcript was already marked final. `user_speech_timeout` is still honored as a floor — STT finalization never shortens it.

changelog/4340.added.md

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+- Added `XAISTTService` for real-time speech-to-text using xAI's voice STT WebSocket API (`wss://api.x.ai/v1/stt`). Streams raw audio (PCM, µ-law, or A-law) and emits interim and final transcription frames driven by the server's `is_final` / `speech_final` flags. Settings expose `interim_results`, `endpointing`, `language`, `multichannel`, `channels`, and `diarize`. Requires the `xai` optional extra (`pip install "pipecat-ai[xai]"`).

changelog/4341.added.md

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+- Added `XAITTSService` for streaming text-to-speech using xAI's WebSocket TTS endpoint (`wss://api.x.ai/v1/tts`). Streams `text.delta` chunks up and base64 `audio.delta` chunks down on the same connection so audio begins flowing before the full utterance finishes synthesizing; complements the batch-HTTP `XAIHttpTTSService`. Defaults to raw PCM output so `TTSAudioRawFrame` needs no decoding. The `xai` optional extra now pulls in `pipecat-ai[websockets-base]`.

changelog/4344.fixed.md

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+- Fixed `ElevenLabsTTSService` and `ElevenLabsHttpTTSService` emitting word timestamps and `TTSTextFrame` content that matched the input text instead of the spoken audio when a pronunciation dictionary (`pronunciation_dictionary_locators`) or text normalization rewrote the input. Both services now consume ElevenLabs' normalized alignment, so downstream consumers (captions, transcripts, context aggregation) reflect what the listener actually hears.

changelog/4347.fixed.md

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+- Fixed a crash in `DeepgramSTTService` when an `STTUpdateSettingsFrame` arrived before the WebSocket handshake completed (for example, when pushing an update upstream on `StartFrame`). The settings-triggered reconnect cancelled the in-flight connection task before its keepalive task was created, causing an `UnboundLocalError: cannot access local variable 'keepalive_task'` in the handler's `finally` block.

changelog/4349.changed.md

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+- ⚠️ `PlivoFrameSerializer` and `TelnyxFrameSerializer` now raise `ValueError` at construction when `auto_hang_up=True` (the default) but required credentials are missing, matching `TwilioFrameSerializer`. Previously they constructed successfully and the hangup failed silently at call-end, leaving phantom billable sessions on the provider. If you relied on the old silent behavior, pass `auto_hang_up=False` explicitly or provide the credentials. The specific fields checked are `call_id`/`auth_id`/`auth_token` for Plivo and `call_control_id`/`api_key` for Telnyx.