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Phase 5.1-5.5: Creatures & Ecology foundation - 3 species data (Crystallid, Acidophile, Reagent) with real chemistry - ECS components: Creature, AI, Metabolism, LifeCycle - AI FSM system: idle → wander → feed → flee → attack - Metabolism: energy drain, feeding from resources, starvation damage - Life cycle: egg → youth → mature → aging → natural death - Population dynamics: counting, reproduction, initial spawning - Species registry with numeric/string ID lookup - 51 tests passing (272 total) Co-authored-by: Cursor <cursoragent@cursor.com>