Jonas Reith
2ab62278c6
The random step jitter in _build_region_borders() was still ±4.0, a constant left over from before the island rescale — at the new border_spacing of 3.5 that could produce near-zero or even negative steps as often as it produced 7.5-unit gaps, independent of position along the ridge (hence gaps showing up near the center too, just by bad luck). Jitter is now proportional to border_spacing (±25%), and spacing itself tightened to 1.5 for a denser wall. Verified headless: 142 border props total, max gap along one ridge now ~1.9 units (was up to 7.5), consistent from table edge to girdle.