AI cannot independently build a stable playable Chinese county-town GTA-style demo

This record comes from the local gta-county-demo project. Under human direction, it already has Three.js, Unity, and Unreal county-town slice prototypes with streets, storefronts, stalls, NPCs, vehicles, rainy-night atmosphere, minimap, and interaction prompts.

Have AI produce a stable playable Chinese county-town GTA-style vertical slice from requirements: third-person character, county-town intersection, drivable vehicles, NPC daily behavior, collision, realistic lighting/materials, mission loop, and maintainable engineering structure.

AI can solve individual pieces, but the full project breaks across street density, character proportions, collision credibility, vehicle order, NPC behavior, map continuity, material consistency, Chinese storefront authenticity, and long-term code maintainability.

A county-town GTA is not a single generation task; it is a coupled product, art, gameplay, and engineering system. AI still lacks stable cross-module product judgment, lived regional context, sustained debugging, and long-term constraint control.

Deliver at least a 5-10 minute playable slice with walking, driving, interactive NPCs, mission objective, county-town street density, reliable collision, stable FPS, and reproducible build; blind testers should feel it is a Chinese county-town GTA experience rather than a stitched technical demo.