feat: run AutoMessage on six platforms, one core behind all of them

.github/workflows/gradle.yml

@@ -21,10 +21,10 @@ jobs:
     runs-on: ubuntu-latest
     steps:
       - uses: actions/checkout@v7
-      - name: Set up JDK 21
+      - name: Set up JDK 25
         uses: actions/setup-java@v5
         with:
-          java-version: '21'
+          java-version: '25'
           distribution: 'temurin'
 
       - name: Setup Gradle

.gitignore

@@ -4,9 +4,9 @@ build/
 !**/src/main/**/build/
 !**/src/test/**/build/
 
-### run-paper ###
-# Working directory of the runServer task: a whole Paper install, worlds and logs.
-/automessage-loader/run/
+### run-paper / run-velocity / loom ###
+# Working directories of the runServer tasks: whole server installs, worlds and logs.
+**/run/
 
 ### IntelliJ IDEA ###
 .idea/
@@ -39,5 +39,15 @@ bin/
 ### VS Code ###
 .vscode/
 
+### JVM crash and heap dumps ###
+# A heap dump is written next to the working directory when a build runs out of memory, and one
+# of these is 750 MB - large enough that GitHub refuses the push that carries it.
+*.hprof
+hs_err_pid*.log
+replay_pid*.log
+
 ### Mac OS ###
-.DS_Store
+.DS_Store
+
+# Kotlin build sessions
+**/.kotlin/