Targeted NeoForge 26.3.0.83

- NeoForge builds compile against NeoForge 26.3.0.83
- The NeoForge mod requires NeoForge 26.3.0.65-beta or newer, the first build without the cached world array
- NeoForge server access test covers publishing, removing and restoring runtime levels against the live level map
- README platform table and bug template name the current NeoForge target

adapters/neoforge/src/main/resources/META-INF/neoforge.mods.toml

@@ -25,7 +25,7 @@ logoFile = "assets/irisworldgen/icon.png"
 [[dependencies.irisworldgen]]
 modId = "neoforge"
 type = "required"
-versionRange = "[26.3,26.4)"
+versionRange = "[26.3.0.65-beta,26.4)"
 ordering = "NONE"
 side = "BOTH"