0.2.18

## Bug Fixes

- **Fix SimulStreaming VRAM leak** :  cross-attention tensors were accumulating unboundedly during the decoding loop (up to env 5GB on repetition loops). Now capped to a rolling window (#283, #275)
- **Fix `--direct-english-translation` not working with LocalAgreement backends** : `task="translate"` was never propagated to the ASR backend's `transcribe_kargs`, so whisper always ran in transcribe mode regardless of the flag. (#306)
- **Fix `model_cache_dir` ignored in SimulStreaming** : download path was hardcoded to `None`. Also fixed `task` being passed as a boolean instead of a string (`"translate"`/`"transcribe"`). (#310)
- **Fix `NoneType` concatenation in `add_translation`** : crash when `ts.text` was `None` during translation overlay. (#296)
- **Fix `Segment().from_tokens()` bad classmethod call** : was incorrectly called on an instance instead of the class. (#331)
- **Fix `token.has_ended` type narrowing** : replaced `token.is_silence()` (non-existent method) with proper `isinstance(token, Silence)` check. (#329)

## Improvements

- **Add `probability` field to `ASRToken`** FasterWhisperASR now passes word-level probabilities through (#330, #313)
- **Add `insert_audio_chunk` to `DiartDiarization`**, brings the interface in line with `SortformerDiarization` (#332)
- **Initialize `OpenaiApiASR.task`** : was previously referenced but never set, causing potential `AttributeError`.