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Fix Cyrillic word boundaries, prevent panic on empty responses

- Replace \b with Unicode-aware boundaries (?:^|[^\p{L}]) / (?:[^\p{L}]|$)
  since Go RE2 \b only matches ASCII word chars
- Skip categories with empty Responses slice to prevent rand.Int63n(0) panic
- Add Cyrillic matching tests and empty responses tests

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>