Fixes from code review:
- Remove duplicate generateDogNameForDispatch, reuse generateDogName
- Fix race condition: assign work BEFORE sending mail
- Add rollback if mail send fails (clear work assignment)
- Fix misleading help text (was "hooks mail", actually sends mail)
- Add --json flag for scripted output
- Add --dry-run flag to preview without executing
The order change (assign work first, then send mail) ensures that if
AssignWork fails, no mail has been sent. If mail fails after work is
assigned, we rollback by clearing the work assignment.
Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>
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