Refine terrain and pregeneration

- Add coherent river width variation and shape source and terminal pools.
- Preserve separated hydrology intervals when checking river connectivity.
- Reduce footprint sorting, engine context lookup, and terrain blending work.
- Reuse modded snapshot validation after content and registry checks.
- Explain production pack update staging and restart requirements.
- Retain pregeneration map updates before its desktop window opens.
- Improve pregeneration layout, coordinate hover, keyboard controls, and error details.
- Add the new desktop labels to every supported language catalog.
- Add the buildPsychoLT entry point for verified platform outputs.
- Cover terrain, validation, and desktop behavior with regression tests.

build.gradle

@@ -775,6 +775,12 @@ tasks.register('buildAll') {
     }
 }
 
+tasks.register('buildPsychoLT') {
+    group = 'development'
+    description = 'Builds all verified Iris platform jars and stages them in the local test-server dropins and PluginOuts.'
+    dependsOn('buildAll')
+}
+
 tasks.register('irisDev', Copy) {
     group = 'iris'
     from(project(':core').layout.buildDirectory.files('libs/core-javadoc.jar', 'libs/core-sources.jar'))