Connor Peet ba2e206efe tools: cleanup unused pause logic (#3488)
We removed the 'pause' feature back in ~June, cleanup logic we still had
around it. This removes:

- The PauseController class which was no longer being used
- onPaused event parameters from chat participant, request, and intent
  handlers
- Pause-related event listening and stream pausing logic
- Simplified throwIfCancelled to be synchronous since it no longer needs
  to wait for pause resumption

(Commit message generated by Copilot)
2026-02-05 18:24:07 +00:00
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