Support Minecraft 26.1.2 and 26.2

Adds the v26_1_R1 binding, which covers both versions. 26.x servers are
not obfuscated and need Java 25, so the build moves to Gradle 9.5.1 and
paperweight-userdev 2.0.0-beta.21, and the binding compiles against the
26.1.2 dev bundle with a Java 25 toolchain while everything else stays on
Java 21.

On 26.x every world is a dimension inside the main level, so the binding
provides DimensionWorldStorage:
- world folders resolve to <level>/dimensions/<namespace>/<key>
- data packs go to the level's datapacks folder
- Iris data in a pre-26.1 world folder is moved into the dimension
  before Paper imports the world and deletes the old folder
- "main=true" swaps the world in as the level's overworld instead of
  changing level-name

Also:
- INMS compares 1.x and 26.x versions in release order
- data pack formats 101 (26.1.2) and 107 (26.2), declared with
  min_format/max_format from format 82 on
- dimension types get the fields 26.1 added
- the Java safeguard accepts Java 25

Model used: Claude Opus 5.5

build.gradle.kts

@@ -34,7 +34,7 @@ plugins {
 }
 
 group = "com.volmit"
-version = "3.9.2-1.20.1-1.21.11"
+version = "3.9.2-1.20.1-26.2"
 
 apply<ApiGenerator>()
 
@@ -64,6 +64,7 @@ val color = "truecolor"
 val errorReporting = "true" == findProperty("errorReporting")
 
 val nmsBindings = mapOf(
+    "v26_1_R1" to "26.1.2.build.74-stable",
     "v1_21_R7" to "1.21.11-R0.1-SNAPSHOT",
     "v1_21_R6" to "1.21.10-R0.1-SNAPSHOT",
     "v1_21_R5" to "1.21.8-R0.1-SNAPSHOT",
@@ -76,7 +77,9 @@ val nmsBindings = mapOf(
     "v1_20_R2" to "1.20.2-R0.1-SNAPSHOT",
     "v1_20_R1" to "1.20.1-R0.1-SNAPSHOT",
 )
-val jvmVersion = mapOf<String, Int>()
+val jvmVersion = mapOf("v26_1_R1" to 25)
+// From 26.1 on the server is not obfuscated, so these bindings compile against Paper's dev bundle as-is.
+val userDevBindings = setOf("v26_1_R1")
 nmsBindings.forEach { (key, value) ->
     project(":nms:$key") {
         apply<JavaPlugin>()
@@ -84,7 +87,7 @@ nmsBindings.forEach { (key, value) ->
         nmsBinding {
             jvm = jvmVersion.getOrDefault(key, 21)
             version = value
-            type = NMSBinding.Type.DIRECT
+            type = if (key in userDevBindings) NMSBinding.Type.USER_DEV else NMSBinding.Type.DIRECT
         }
 
         dependencies {
@@ -96,7 +99,7 @@ nmsBindings.forEach { (key, value) ->
 
     tasks.register<RunServer>("runServer-$key") {
         group = "servers"
-        minecraftVersion(value.split("-")[0])
+        minecraftVersion(value.substringBefore("-").substringBefore(".build"))
         minHeapSize = serverMinHeap
         maxHeapSize = serverMaxHeap
         pluginJars(tasks.jar.flatMap { it.archiveFile })
@@ -115,7 +118,7 @@ val included: Configuration by configurations.creating
 val jarJar: Configuration by configurations.creating
 dependencies {
     for (key in nmsBindings.keys) {
-        included(project(":nms:$key", "reobf"))
+        included(project(":nms:$key", if (key in userDevBindings) "runtimeElements" else "reobf"))
     }
     included(project(":core", "shadow"))
     jarJar(project(":core:agent"))
@@ -190,7 +193,7 @@ allprojects {
 
     java {
         toolchain {
-            languageVersion.set(JavaLanguageVersion.of(21))
+            languageVersion.set(JavaLanguageVersion.of(jvmVersion.getOrDefault(name, 21)))
         }
     }