Maps are editor-built scenes: [Tool] Playground/Crag, headless rebuild for agents

scenes/maps/playground.tscn and crag.tscn are generated by the map scripts' Rebuild (inspector
button, or godot-mono --headless --path . tools/rebuild_maps.tscn) and loaded as saved by the game,
so hand edits stick. The crag route is saved as Marker3D nodes and crag_spike checks the saved
scene. Layout verified identical to the code-built one (tools/map_dump.tscn).

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

scripts/CragSpike.cs

@@ -1,7 +1,8 @@
 using Godot;
 using System.Collections.Generic;
 
-// Regression for the crag (no player): the route is climbable on paper — consecutive route points
+// Regression for the crag (no player), checked on the SAVED scenes/maps/crag.tscn (route = its
+// Route markers; rebuild with tools/rebuild_maps.tscn): the route is climbable on paper — consecutive route points
 // within human reach, every point in free space, route pieces not buried in each other or the
 // rock — the summit is high enough, and it's in plain view from spawn. Prints "CRAG: overall PASS".
 public partial class CragSpike : Node3D
@@ -23,8 +24,9 @@ public partial class CragSpike : Node3D
         floor.AddToGroup(PropGrabber.NoGrabGroup);
         floor.AddChild(new CollisionShape3D { Shape = new BoxShape3D { Size = new Vector3(80, 0.1f, 80) }, Position = new Vector3(0, -0.05f, 0) });
         AddChild(floor);
-        AddChild(new Playground());
-        _crag = new Crag();
+        // The SAVED scenes (as the game loads them, hand edits included), not a fresh rebuild.
+        AddChild(GD.Load<PackedScene>("res://scenes/maps/playground.tscn").Instantiate());
+        _crag = GD.Load<PackedScene>("res://scenes/maps/crag.tscn").Instantiate<Crag>();
         AddChild(_crag);
     }