How to verify this implementation
Follow the testing portal from the first session to advanced and operator checks.
Use https://gpttesting.vesperan.xyz for step-by-step test paths with prerequisites, exact UI actions, expected results and failure observations. Start with command visibility and the zero-start journey, then establish earned suppliers before two-player trade.
Keep a record of the build, interface, initial resources, timing and observed outcome. Do not treat a button appearing as proof that its complete transaction works. Expected rejections are a success only when they preserve ownership and resources.
The test checklists are stored locally in your own browser; they are convenience tracking, not shared automated evidence. Use isolated operator paths for clock manipulation, save copies and restore drills. The public testing site itself has no power to grant resources or mutate the game.