fix(voice): clear committed turn on resumed speech

[Shivakushwah143]

Summary

Fixes #7010.

In manual turn-detection mode, commit_user_turn() sets
_user_turn_committed = True while the end-of-turn task is running.

If VAD emits START_OF_SPEECH before that task completes, the task is
cancelled but _user_turn_committed remains True.

Because the cancelled task never reaches its normal cleanup path, the
manual-mode guard in _on_stt_event() then drops subsequent transcript
events.

This change clears _user_turn_committed when START_OF_SPEECH
cancels the pending end-of-turn task.

Changes

• Clear _user_turn_committed when resumed speech cancels the pending EOU task.
• Add regression coverage verifying the committed flag is cleared.
• Add regression coverage verifying subsequent FINAL_TRANSCRIPT events are not dropped.

Testing

Added focused regression tests in
tests/test_audio_recognition_turn_detection.py.

Local execution was blocked by the current development environment /
dependency setup, but the modified Python files pass syntax validation and
the patch is intentionally limited to the affected state transition.

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[devin-ai-integration]

✅ Devin Review: No Issues Found

Devin Review analyzed this PR and found no bugs or issues to report.