ZoneGenerator.Place owns every generated distance, fold and belt width

PlanetSafetyRadius, ChildDistanceMinimum/Maximum, ExpandSolar's distance series
and the window filters are deleted. Place (ported from replace.py, root window
from rootReach per root-window-floor) lays children inside-out, folds the
lightest family while the outermost overflows, stretches to the window, merges
rings that cannot keep their heavy member outside its Roche margin and sets
belt half widths. Stations pick well-bearing, sibling-clear off-ring bodies;
the tutorial entrance falls back to an orbit round a root node; turrets stop a
side when within the base body's extent. GenerateZone/GenerateArena take
PlanetSettings. Not yet built.

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>

Assets/Scripts/ServerShared/Settings.cs

@@ -111,7 +111,6 @@ public class TutorialGenerationSettings
 [Serializable, MessagePackObject(keyAsPropertyName:true), JsonObject]
 public class ZoneGenerationSettings
 {
-    public ExponentialCurve PlanetSafetyRadius;
     
     public float MassFloor = 1;
     public float SunMass = 10000;