/** Per-tile simulation state — pure physical data, no game resource dependency. */
export interface TileState {
    readonly tileId: number;
    /**
     * Integer band index in `[0, N-1]` where `N` is derived from
     * `(radius, coreRadiusRatio)` via `resolveTerrainLevelCount`. `0` is
     * the band closest to the core; higher values stack outward. Derived from
     * seeded simplex noise ranked into `N` equal-frequency bins, so the value
     * space is deterministic, uniform, and decoupled from the raw noise range.
     *
     * Sea level floats freely inside the same integer space
     * (see {@link BodySimulation.seaLevelElevation}) — submerged status is
     * computed live from `elevation < seaLevelElevation`, never baked here.
     */
    readonly elevation: number;
}
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