Document the local Godot 4.7.2 toolchain

Record the upgraded 4.7.2 binary, the retained 4.3 backup and the matching
export templates. Keep the project/CI baseline at 4.3 and note that 4.7.2
verified import, tests, the session smoke and a Linux export. Hide the
4.7-generated per-script UID sidecars from this clone only.

docs/getting-started.md

@@ -2,7 +2,7 @@
 
 ## Setup
 
-1. Download the Godot 4.3 editor (official build) and put `godot` on your PATH.
+1. Download the Godot 4.3+ editor (official build) and put `godot` on your PATH. CI pins 4.3; local development is verified with 4.7.2.
 2. Open or run the project from this directory.
 
 ## Run and Test