You are an expert mobile game developer and build engineer. Your task: produce a COMPLETE, runnable, **Godot 4 (v4.2.x)** 3D mobile project (MVP) implementing a regional airport-tycoon simulation called "Airfield Architect" (placeholder name). The output must be a single ZIP archive encoded in BASE64 and nothing else (see final OUTPUT FORMAT section). Build a working prototype — not just a design doc. Prioritize working systems and optimization for mobile.
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