v1.2.0 — target MC 26.1.2

User reported NoClassDefFoundError: net/minecraft/class_7471 on MC 26.1.2.
Root cause: v1.1.1 was built for 1.21.6 intermediary, which uses
class_NNNN obfuscated names. MC 26.x ships an unobfuscated server jar
with Mojang names directly, so intermediary lookups for class_7471
(=PlayerChatMessage in 1.21.6) fail at runtime.

Build retargeted to 26.1.2:
- minecraft 26.1.2 / loader 0.19.2 / fabric-api 0.148.2+26.1.2
- Loom 1.16-SNAPSHOT, Shadow 9.4.1 (Java 25 bytecode support)
- Gradle 9.5.1, JDK 25 toolchain
- Drop officialMojangMappings(); use intermediary:0.0.0 identity
  (Mojang stopped publishing proguard mappings for 26.x).
- Adapt code: ServerPlayer.getServer() removed in 26.1.2 → use
  player.level().getServer() (ServerPlayer.level() returns ServerLevel).
- NeoForge dropped from this build — moddev plugin can't parse 26.1.2
  yet, falls back to 1.21.5.
- 1.2.0 = Fabric only; 1.21.6 users stay on 1.1.1.

fabric/build.gradle

@@ -1,9 +1,9 @@
 plugins {
-    id 'fabric-loom' version '1.10-SNAPSHOT'
-    id 'com.gradleup.shadow' version '8.3.5'
+    id 'fabric-loom' version '1.16-SNAPSHOT'
+    id 'com.gradleup.shadow' version '9.4.1'
 }
 
-archivesBaseName = "${project.mod_id}-fabric"
+base.archivesName = "${project.mod_id}-fabric"
 
 // common/ 디렉토리의 로더 비종속 소스를 fabric 컴파일에 포함 (Mojang 매핑으로 컴파일)
 sourceSets {
@@ -15,14 +15,11 @@ sourceSets {
 }
 
 dependencies {
+    // MC 26.x: server jar 가 unobfuscated. intermediary 0.0.0 = identity mapping.
     minecraft "com.mojang:minecraft:${project.minecraft_version}"
-    mappings loom.officialMojangMappings()
-    modImplementation "net.fabricmc:fabric-loader:${project.loader_version}"
-    modImplementation "net.fabricmc.fabric-api:fabric-api:${project.fabric_version}"
-}
-
-loom {
-    serverOnlyMinecraftJar()
+    mappings "net.fabricmc:intermediary:0.0.0:v2"
+    implementation "net.fabricmc:fabric-loader:${project.loader_version}"
+    implementation "net.fabricmc.fabric-api:fabric-api:${project.fabric_version}"
 }
 
 processResources {
@@ -30,6 +27,8 @@ processResources {
     inputs.property "mod_id", project.mod_id
     inputs.property "mod_name", project.mod_name
 
+    filteringCharset = 'UTF-8'
+
     filesMatching("fabric.mod.json") {
         expand(
             "version": project.version,