Add changelog entries

Author: dakshdua

changelog/5681.fixed.2.md

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+Fixed a word-timestamp event that matched no slot being discarded without a word in streaming mode (a TTS service configured with `TextAggregationMode.TOKEN`), such as a mark a provider reports on its own after the preceding word already took it. It was held in the buffer until the next sentence promotion, which dropped it as stale because the context it belonged to was already gone. The context that owns it now logs it and drops it when that context ends, matching what sentence mode already does when a word cannot be placed.

changelog/5681.fixed.md

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+Fixed `AggregatedFrameSequencer.force_complete` emitting the text it force-completes as a `TTSTextFrame` without a matching `AggregatedTextProgressFrame`, so the progress view stopped where the TTS provider stopped reporting words while the word frames carried the rest of the turn.