debug wireframe: allowance areas option (off, floating spots, all edges) from an exact port of the engine floor test, capped by level memory

CHANGELOG.md

@@ -1,5 +1,12 @@
 # Changelog
 
+## 0.2.4 – unreleased
+
+- **Debug wireframe: new option "Allowance areas"** (off by default). The game counts the llama as
+  standing on a floor even a little outside its edges; at sharp corners this margin becomes a long
+  sliver where the llama can stand in the air. *Floating spots* marks those places in pink, *All edges*
+  draws the margin as a thin pink band along every floor edge.
+
 ## 0.2.3 – 2026-11-07
 
 - **Editor:** flying with the right mouse button + W A S D / Q E now works even when another part of