- Added `includes_inter_frame_spaces` parameter to `TTSService.add_word_timestamps` and `_add_word_timestamps` (default `None`). When `True`, downstream consumers will not inject additional spaces between tokens; `None` leaves each frame's own default unchanged.
- `InworldTTSService` now passes `includes_inter_frame_spaces=True` when reporting word timestamps, since Inworld tokens already include inter-word spacing.