Introduce Bookwork, a single-player word puzzle game where players
battle opponents by forming words from a 5×5 letter grid. Features:
- 20 levels with unique opponents, escalating difficulty, and special
tile drops (fire, poison) via AI-driven attack system
- Grid mechanics: adjacent tile selection, word validation, damage
calculation with gold/diamond multipliers, and fire tile self-damage
- Progression system with HP milestones, potion unlock, and server-
persisted level completion
- Polished battle UI with animated word submission, fireworks, HP bars,
portrait system, and victory/defeat overlays
- Full test suite (verifyBookwork.js) covering grid generation, damage
formulas, refill logic, AI probabilities, and level data validation
