Tests all spec-required behaviors: spawn/list, invalid-kind and missing-anchor validation, ttl expiry via engine.time monkey-patch, despawn idempotency, entity-anchor position tracking, fixed-anchor snapshot, composite child count, alpha envelope (mid-hold and fade-out phases), entity-destroyed last_pos fallback, and rise_px formula verification. 23 pass, 0 fail.
252 B
252 B