CLI tool to preview monologue/dialogue line selection for a given game state. 4 subcommands: dialogue (D-028 4-layer pipeline), monologue (trigger + prerequisite evaluation), coverage (dead conversation detection), sequence (walk-through simulation). Authoring tool for content team — tests line trigger logic without running the full game. Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>