Trigger: User wants a structured review of a Game Design Document (GDD).
Use when: "review my GDD", "game review", "check my game design", "how's my GDD", "/game-review", or user has a docs/gdd.md and asks for design feedback.
Do NOT use when: User wants code review (use /review), balance-specific analysis (use /balance-review), or brainstorming from scratch (use /game-ideation).
