Proof before promises.

System id is not pose. Two entry paths that share a label still need a shared placement contract. Mixing local and world spaces looks like a “warp bug” to the player and like a one-line vector add to an AI assistant. Own one arrival policy per intent (vista vs near-dock) and test metres, not only flags.

Capture modes are exclusive with clickable overlays. Own the transition: exit lock, tell the player how, and do not bind ESC to two verbs. Device-specific UI (hide the hint on gamepad) is part of correctness, not polish.

GPU contexts are a shared budget, not a private field on a component. Lifecycle is pause vs destroy. An AI that “cleans up” with dispose() on every React-like unmount can take down the game view. Count live renderers; test reopen loops, not a single open.

Economy fields need names for each consumer (shop vs unlock vs repair). Shared += on credits is how duplicate rewards happen. Difficulty, loot, and progression are three knobs; coupling them in a prompt will “balance” the wrong one.

Shipping is a checklist that can fail, not a screenshot of the store. Encode language, input, and persistence as cells. Never put Steamworks admin identity in educational write-ups. AI that “just uploads the build” skips the only tests that catch Last Run and cloud ordering.