- Change poll() to fire specifyTask() with `void` instead of `await`, enabling concurrent task specification bounded by AgentSemaphore
- Add JSDoc to poll() documenting concurrent dispatch and re-entrance guard behavior
- Add tests for concurrent dispatch, semaphore limiting, polling flag reset, and overlapping poll discovery
- Update existing re-entrance guard test to block on listTasks (discovery) rather than specifyTask
- Fix existing paused-tasks and globalPause tests for non-blocking dispatch timing
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