Stabilized shutdown and Studio

- Shutdown protection initializes before enable and drains inline when retention fails
- Cleanup preserves class loader retention and closes native providers in order
- Error reports retain context and handle empty stack traces
- Studio maps retain partial coverage and suspend hidden views
- Hydrology previews refresh when plans and rasters complete
- Terrain scratch hashing spreads lattice samples across cache slots
- Plugin and probe artifacts include LWJGL libraries and native resources
- Regression tests cover shutdown, error reporting, map progress, and terrain scratch

build.gradle

@@ -180,6 +180,13 @@ def jarJar = configurations.create('jarJar')
 dependencies {
     add('included', project(path: ':core', configuration: 'shadow'))
     add('included', project(path: ':adapters:bukkit:plugin', configuration: 'runtimeElements'))
+    // Shaded: the runtime downloader can neither fetch the natives classifiers nor relocate lwjgl's own jar.
+    add('included', libs.lwjgl)
+    add('included', libs.lwjgl.opengl)
+    add('included', libs.lwjgl.egl)
+    add('included', libs.lwjgl.jawt)
+    add('included', variantOf(libs.lwjgl) { classifier('natives-linux') })
+    add('included', variantOf(libs.lwjgl.opengl) { classifier('natives-linux') })
     add('jarJar', project(':core:agent'))
 }
 
@@ -194,6 +201,7 @@ tasks.named('jar', Jar).configure {
     includeEmptyDirs = false
     from(jarJar)
     from(provider { included.resolve().collect { zipTree(it) } }) {
+        exclude('META-INF/INDEX.LIST')
         exclude('languages/**')
         exclude('com/fren_gor/**')
 
@@ -734,6 +742,7 @@ pluginPackaging {
             policyName = 'Iris Bukkit'
             packed = true
             packedJarAccessors = ['art/arcane/iris/platform/bukkit/plugin/VolmitPlugin#getJarFile']
+            packedPayloadOnlyPrefixes = ['linux/x64/org/lwjgl/', 'iris-language-guides/']
             stripDirectories = true
             stripLocalVariables = true
             releaseCompression = providers.gradleProperty('compactRelease')