chore: add TUI test evidence for policy generation escape fix

Screenshots captured via TUI harness showing:
- Full add-policy generation flow
- Error case: Escape from error correctly returns to description step
- Success case: Escape from review correctly returns to description step
- Regenerate correctly returns to description step

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

Author: jesseturner21