elevationDebounceFrames

Number of consecutive frames with a stable RenderContext.elevationModelTimestamp required before a tile-arrival burst triggers a re-sample. Default ~30 frames (~0.5 s at 60 fps). On Kotlin/JS where the elevation grid sample runs on the event loop, an unfiltered tick-per-tile would stall the page repeatedly during initial map load; debouncing collapses the burst into one sample after tiles settle. Position changes still bypass this and trigger immediately.

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