Deterministic Simulation and Evidence

"The code is written" is not evidence. Neither is "it compiles", "it looks right", or a screenshot of the editor. For agent-driven development this matters more than usual, because the agent cannot see the game and the human is not watching every run.

The cheapest evidence in a vehicle-combat game is a seeded headless match: run twenty full AI matches in seconds, with no rendering, and assert every one terminated with a legal winner. That single test catches AI stalls, unclosable endgames, scoring bugs, and match-flow regressions at once — and it costs nothing to re-run on every change.

Establish the determinism contract first

Determinism is not a feature you add later. It is a set of constraints you either adopt at the start or pay dearly to retrofit.