Fixes race condition where Enter key arrives before paste is fully
processed, causing workers to sit idle at prompts.
- SendKeys now uses 100ms default debounce
- New SendKeysDebounced allows configurable delay
- Inject scales delay 100-500ms based on message size
Closes: gt-w3bu
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Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>
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