commit 6ab43a168edefbfdfea7cb0fb7703168310c630e
Author: claude-timemachine <llm@timemachine.center>
Date:   Tue Jun 2 20:16:40 2026 +0200

    initial: Kotlin/Gradle skeleton for cloud-installer
    
    Compiles to a 3.4 MB fat jar via shadow plugin.
    Entrypoint with CLI dispatch (pull/push subcommands) + FlatLaf init.
    Real sync logic stubbed; lands in subsequent commits per task plan.
    
    Build via containerized gradle (8.10.2 + jdk21) to sidestep the
    Kotlin 2.1 + JDK 26 compiler crash. Documented in README.
    
    CI workflow tags-only release artifact upload prepared (needs
    RELEASE_TOKEN secret in repo settings before first tag).

diff --git a/.gitea/workflows/ci.yaml b/.gitea/workflows/ci.yaml
new file mode 100644
index 0000000..ff47f3b
--- /dev/null
+++ b/.gitea/workflows/ci.yaml
@@ -0,0 +1,59 @@
+name: CI
+
+on:
+  push:
+    branches: [main]
+    tags: ["v*"]
+  pull_request:
+    branches: [main]
+
+jobs:
+  build:
+    runs-on: ubuntu-latest
+    timeout-minutes: 15
+    container:
+      image: docker.io/gradle:8.10.2-jdk21
+    steps:
+      - uses: actions/checkout@v4
+
+      - name: Build fat jar
+        run: gradle --no-daemon shadowJar
+
+      - name: Test
+        run: gradle --no-daemon test
+
+      - name: Stash jar for release
+        if: startsWith(github.ref, 'refs/tags/v')
+        uses: actions/upload-artifact@v4
+        with:
+          name: cloud-installer-jar
+          path: build/libs/cloud-installer-*.jar
+
+  release:
+    runs-on: ubuntu-latest
+    needs: build
+    if: startsWith(github.ref, 'refs/tags/v')
+    steps:
+      - uses: actions/checkout@v4
+
+      - uses: actions/download-artifact@v4
+        with:
+          name: cloud-installer-jar
+          path: build/libs/
+
+      - name: Publish release
+        run: |
+          gh_token="${{ secrets.RELEASE_TOKEN }}"
+          tag="${GITEA_REF#refs/tags/}"
+          curl -sS -X POST \
+            -H "Authorization: token ${gh_token}" \
+            -H "Content-Type: application/json" \
+            -d "{\"tag_name\":\"${tag}\",\"name\":\"${tag}\",\"draft\":false,\"prerelease\":false}" \
+            "${GITEA_SERVER_URL}/api/v1/repos/${{ gitea.event.repository.full_name }}/releases" > /tmp/release.json
+          release_id=$(jq -r .id /tmp/release.json)
+          for jar in build/libs/cloud-installer-*.jar; do
+            curl -sS -X POST \
+              -H "Authorization: token ${gh_token}" \
+              -F "attachment=@${jar}" \
+              "${GITEA_SERVER_URL}/api/v1/repos/${{ gitea.event.repository.full_name }}/releases/${release_id}/assets?name=$(basename $jar)"
+          done
diff --git a/.gitignore b/.gitignore
new file mode 100644
index 0000000..1b8acca
--- /dev/null
+++ b/.gitignore
@@ -0,0 +1,8 @@
+.gradle/
+build/
+out/
+*.iml
+.idea/
+.vscode/
+*.swp
+local.properties
diff --git a/.kotlin/errors/errors-1780423931355.log b/.kotlin/errors/errors-1780423931355.log
new file mode 100644
index 0000000..4b21b1e
--- /dev/null
+++ b/.kotlin/errors/errors-1780423931355.log
@@ -0,0 +1,41 @@
+kotlin version: 2.1.0
+error message: java.lang.IllegalArgumentException: 26.0.1
+	at org.jetbrains.kotlin.com.intellij.util.lang.JavaVersion.parse(JavaVersion.java:307)
+	at org.jetbrains.kotlin.com.intellij.util.lang.JavaVersion.current(JavaVersion.java:176)
+	at org.jetbrains.kotlin.cli.jvm.modules.JavaVersionUtilsKt.isAtLeastJava9(javaVersionUtils.kt:11)
+	at org.jetbrains.kotlin.cli.jvm.modules.CoreJrtFileSystem.globalJrtFsCache$lambda$2(CoreJrtFileSystem.kt:83)
+	at org.jetbrains.kotlin.cli.jvm.modules.CoreJrtFileSystem.globalJrtFsCache$lambda$3(CoreJrtFileSystem.kt:74)
+	at org.jetbrains.kotlin.com.intellij.util.containers.ConcurrentFactoryMap$2.create(ConcurrentFactoryMap.java:174)
+	at org.jetbrains.kotlin.com.intellij.util.containers.ConcurrentFactoryMap.get(ConcurrentFactoryMap.java:40)
+	at org.jetbrains.kotlin.cli.jvm.modules.CoreJrtFileSystem.roots$lambda$0(CoreJrtFileSystem.kt:34)
+	at org.jetbrains.kotlin.cli.jvm.modules.CoreJrtFileSystem.roots$lambda$1(CoreJrtFileSystem.kt:33)
+	at org.jetbrains.kotlin.com.intellij.util.containers.ConcurrentFactoryMap$2.create(ConcurrentFactoryMap.java:174)
+	at org.jetbrains.kotlin.com.intellij.util.containers.ConcurrentFactoryMap.get(ConcurrentFactoryMap.java:40)
+	at org.jetbrains.kotlin.cli.jvm.modules.CoreJrtFileSystem.findFileByPath(CoreJrtFileSystem.kt:42)
+	at org.jetbrains.kotlin.cli.jvm.modules.CliJavaModuleFinder.<init>(CliJavaModuleFinder.kt:45)
+	at org.jetbrains.kotlin.cli.jvm.compiler.pipeline.JvmCompilerPipelineKt.createProjectEnvironment(jvmCompilerPipeline.kt:297)
+	at org.jetbrains.kotlin.cli.jvm.K2JVMCompiler.doExecute(K2JVMCompiler.kt:139)
+	at org.jetbrains.kotlin.cli.jvm.K2JVMCompiler.doExecute(K2JVMCompiler.kt:43)
+	at org.jetbrains.kotlin.cli.common.CLICompiler.execImpl(CLICompiler.kt:102)
+	at org.jetbrains.kotlin.cli.common.CLICompiler.exec(CLICompiler.kt:316)
+	at org.jetbrains.kotlin.incremental.IncrementalJvmCompilerRunner.runCompiler(IncrementalJvmCompilerRunner.kt:464)
+	at org.jetbrains.kotlin.incremental.IncrementalJvmCompilerRunner.runCompiler(IncrementalJvmCompilerRunner.kt:73)
+	at org.jetbrains.kotlin.incremental.IncrementalCompilerRunner.doCompile(IncrementalCompilerRunner.kt:506)
+	at org.jetbrains.kotlin.incremental.IncrementalCompilerRunner.compileImpl(IncrementalCompilerRunner.kt:423)
+	at org.jetbrains.kotlin.incremental.IncrementalCompilerRunner.compileNonIncrementally(IncrementalCompilerRunner.kt:301)
+	at org.jetbrains.kotlin.incremental.IncrementalCompilerRunner.compile(IncrementalCompilerRunner.kt:129)
+	at org.jetbrains.kotlin.daemon.CompileServiceImplBase.execIncrementalCompiler(CompileServiceImpl.kt:674)
+	at org.jetbrains.kotlin.daemon.CompileServiceImplBase.access$execIncrementalCompiler(CompileServiceImpl.kt:91)
+	at org.jetbrains.kotlin.daemon.CompileServiceImpl.compile(CompileServiceImpl.kt:1659)
+	at java.base/jdk.internal.reflect.DirectMethodHandleAccessor.invoke(DirectMethodHandleAccessor.java:104)
+	at java.base/java.lang.reflect.Method.invoke(Method.java:565)
+	at java.rmi/sun.rmi.server.UnicastServerRef.dispatch(UnicastServerRef.java:351)
+	at java.rmi/sun.rmi.transport.Transport.serviceCall(Transport.java:166)
+	at java.rmi/sun.rmi.transport.tcp.TCPTransport.handleMessages(TCPTransport.java:543)
+	at java.rmi/sun.rmi.transport.tcp.TCPTransport$ConnectionHandler.run0(TCPTransport.java:744)
+	at java.rmi/sun.rmi.transport.tcp.TCPTransport$ConnectionHandler.run(TCPTransport.java:623)
+	at java.base/java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1090)
+	at java.base/java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:614)
+	at java.base/java.lang.Thread.run(Thread.java:1516)
+
+
diff --git a/.kotlin/errors/errors-1780423962124.log b/.kotlin/errors/errors-1780423962124.log
new file mode 100644
index 0000000..4b21b1e
--- /dev/null
+++ b/.kotlin/errors/errors-1780423962124.log
@@ -0,0 +1,41 @@
+kotlin version: 2.1.0
+error message: java.lang.IllegalArgumentException: 26.0.1
+	at org.jetbrains.kotlin.com.intellij.util.lang.JavaVersion.parse(JavaVersion.java:307)
+	at org.jetbrains.kotlin.com.intellij.util.lang.JavaVersion.current(JavaVersion.java:176)
+	at org.jetbrains.kotlin.cli.jvm.modules.JavaVersionUtilsKt.isAtLeastJava9(javaVersionUtils.kt:11)
+	at org.jetbrains.kotlin.cli.jvm.modules.CoreJrtFileSystem.globalJrtFsCache$lambda$2(CoreJrtFileSystem.kt:83)
+	at org.jetbrains.kotlin.cli.jvm.modules.CoreJrtFileSystem.globalJrtFsCache$lambda$3(CoreJrtFileSystem.kt:74)
+	at org.jetbrains.kotlin.com.intellij.util.containers.ConcurrentFactoryMap$2.create(ConcurrentFactoryMap.java:174)
+	at org.jetbrains.kotlin.com.intellij.util.containers.ConcurrentFactoryMap.get(ConcurrentFactoryMap.java:40)
+	at org.jetbrains.kotlin.cli.jvm.modules.CoreJrtFileSystem.roots$lambda$0(CoreJrtFileSystem.kt:34)
+	at org.jetbrains.kotlin.cli.jvm.modules.CoreJrtFileSystem.roots$lambda$1(CoreJrtFileSystem.kt:33)
+	at org.jetbrains.kotlin.com.intellij.util.containers.ConcurrentFactoryMap$2.create(ConcurrentFactoryMap.java:174)
+	at org.jetbrains.kotlin.com.intellij.util.containers.ConcurrentFactoryMap.get(ConcurrentFactoryMap.java:40)
+	at org.jetbrains.kotlin.cli.jvm.modules.CoreJrtFileSystem.findFileByPath(CoreJrtFileSystem.kt:42)
+	at org.jetbrains.kotlin.cli.jvm.modules.CliJavaModuleFinder.<init>(CliJavaModuleFinder.kt:45)
+	at org.jetbrains.kotlin.cli.jvm.compiler.pipeline.JvmCompilerPipelineKt.createProjectEnvironment(jvmCompilerPipeline.kt:297)
+	at org.jetbrains.kotlin.cli.jvm.K2JVMCompiler.doExecute(K2JVMCompiler.kt:139)
+	at org.jetbrains.kotlin.cli.jvm.K2JVMCompiler.doExecute(K2JVMCompiler.kt:43)
+	at org.jetbrains.kotlin.cli.common.CLICompiler.execImpl(CLICompiler.kt:102)
+	at org.jetbrains.kotlin.cli.common.CLICompiler.exec(CLICompiler.kt:316)
+	at org.jetbrains.kotlin.incremental.IncrementalJvmCompilerRunner.runCompiler(IncrementalJvmCompilerRunner.kt:464)
+	at org.jetbrains.kotlin.incremental.IncrementalJvmCompilerRunner.runCompiler(IncrementalJvmCompilerRunner.kt:73)
+	at org.jetbrains.kotlin.incremental.IncrementalCompilerRunner.doCompile(IncrementalCompilerRunner.kt:506)
+	at org.jetbrains.kotlin.incremental.IncrementalCompilerRunner.compileImpl(IncrementalCompilerRunner.kt:423)
+	at org.jetbrains.kotlin.incremental.IncrementalCompilerRunner.compileNonIncrementally(IncrementalCompilerRunner.kt:301)
+	at org.jetbrains.kotlin.incremental.IncrementalCompilerRunner.compile(IncrementalCompilerRunner.kt:129)
+	at org.jetbrains.kotlin.daemon.CompileServiceImplBase.execIncrementalCompiler(CompileServiceImpl.kt:674)
+	at org.jetbrains.kotlin.daemon.CompileServiceImplBase.access$execIncrementalCompiler(CompileServiceImpl.kt:91)
+	at org.jetbrains.kotlin.daemon.CompileServiceImpl.compile(CompileServiceImpl.kt:1659)
+	at java.base/jdk.internal.reflect.DirectMethodHandleAccessor.invoke(DirectMethodHandleAccessor.java:104)
+	at java.base/java.lang.reflect.Method.invoke(Method.java:565)
+	at java.rmi/sun.rmi.server.UnicastServerRef.dispatch(UnicastServerRef.java:351)
+	at java.rmi/sun.rmi.transport.Transport.serviceCall(Transport.java:166)
+	at java.rmi/sun.rmi.transport.tcp.TCPTransport.handleMessages(TCPTransport.java:543)
+	at java.rmi/sun.rmi.transport.tcp.TCPTransport$ConnectionHandler.run0(TCPTransport.java:744)
+	at java.rmi/sun.rmi.transport.tcp.TCPTransport$ConnectionHandler.run(TCPTransport.java:623)
+	at java.base/java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1090)
+	at java.base/java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:614)
+	at java.base/java.lang.Thread.run(Thread.java:1516)
+
+
diff --git a/.kotlin/errors/errors-1780423982378.log b/.kotlin/errors/errors-1780423982378.log
new file mode 100644
index 0000000..4b21b1e
--- /dev/null
+++ b/.kotlin/errors/errors-1780423982378.log
@@ -0,0 +1,41 @@
+kotlin version: 2.1.0
+error message: java.lang.IllegalArgumentException: 26.0.1
+	at org.jetbrains.kotlin.com.intellij.util.lang.JavaVersion.parse(JavaVersion.java:307)
+	at org.jetbrains.kotlin.com.intellij.util.lang.JavaVersion.current(JavaVersion.java:176)
+	at org.jetbrains.kotlin.cli.jvm.modules.JavaVersionUtilsKt.isAtLeastJava9(javaVersionUtils.kt:11)
+	at org.jetbrains.kotlin.cli.jvm.modules.CoreJrtFileSystem.globalJrtFsCache$lambda$2(CoreJrtFileSystem.kt:83)
+	at org.jetbrains.kotlin.cli.jvm.modules.CoreJrtFileSystem.globalJrtFsCache$lambda$3(CoreJrtFileSystem.kt:74)
+	at org.jetbrains.kotlin.com.intellij.util.containers.ConcurrentFactoryMap$2.create(ConcurrentFactoryMap.java:174)
+	at org.jetbrains.kotlin.com.intellij.util.containers.ConcurrentFactoryMap.get(ConcurrentFactoryMap.java:40)
+	at org.jetbrains.kotlin.cli.jvm.modules.CoreJrtFileSystem.roots$lambda$0(CoreJrtFileSystem.kt:34)
+	at org.jetbrains.kotlin.cli.jvm.modules.CoreJrtFileSystem.roots$lambda$1(CoreJrtFileSystem.kt:33)
+	at org.jetbrains.kotlin.com.intellij.util.containers.ConcurrentFactoryMap$2.create(ConcurrentFactoryMap.java:174)
+	at org.jetbrains.kotlin.com.intellij.util.containers.ConcurrentFactoryMap.get(ConcurrentFactoryMap.java:40)
+	at org.jetbrains.kotlin.cli.jvm.modules.CoreJrtFileSystem.findFileByPath(CoreJrtFileSystem.kt:42)
+	at org.jetbrains.kotlin.cli.jvm.modules.CliJavaModuleFinder.<init>(CliJavaModuleFinder.kt:45)
+	at org.jetbrains.kotlin.cli.jvm.compiler.pipeline.JvmCompilerPipelineKt.createProjectEnvironment(jvmCompilerPipeline.kt:297)
+	at org.jetbrains.kotlin.cli.jvm.K2JVMCompiler.doExecute(K2JVMCompiler.kt:139)
+	at org.jetbrains.kotlin.cli.jvm.K2JVMCompiler.doExecute(K2JVMCompiler.kt:43)
+	at org.jetbrains.kotlin.cli.common.CLICompiler.execImpl(CLICompiler.kt:102)
+	at org.jetbrains.kotlin.cli.common.CLICompiler.exec(CLICompiler.kt:316)
+	at org.jetbrains.kotlin.incremental.IncrementalJvmCompilerRunner.runCompiler(IncrementalJvmCompilerRunner.kt:464)
+	at org.jetbrains.kotlin.incremental.IncrementalJvmCompilerRunner.runCompiler(IncrementalJvmCompilerRunner.kt:73)
+	at org.jetbrains.kotlin.incremental.IncrementalCompilerRunner.doCompile(IncrementalCompilerRunner.kt:506)
+	at org.jetbrains.kotlin.incremental.IncrementalCompilerRunner.compileImpl(IncrementalCompilerRunner.kt:423)
+	at org.jetbrains.kotlin.incremental.IncrementalCompilerRunner.compileNonIncrementally(IncrementalCompilerRunner.kt:301)
+	at org.jetbrains.kotlin.incremental.IncrementalCompilerRunner.compile(IncrementalCompilerRunner.kt:129)
+	at org.jetbrains.kotlin.daemon.CompileServiceImplBase.execIncrementalCompiler(CompileServiceImpl.kt:674)
+	at org.jetbrains.kotlin.daemon.CompileServiceImplBase.access$execIncrementalCompiler(CompileServiceImpl.kt:91)
+	at org.jetbrains.kotlin.daemon.CompileServiceImpl.compile(CompileServiceImpl.kt:1659)
+	at java.base/jdk.internal.reflect.DirectMethodHandleAccessor.invoke(DirectMethodHandleAccessor.java:104)
+	at java.base/java.lang.reflect.Method.invoke(Method.java:565)
+	at java.rmi/sun.rmi.server.UnicastServerRef.dispatch(UnicastServerRef.java:351)
+	at java.rmi/sun.rmi.transport.Transport.serviceCall(Transport.java:166)
+	at java.rmi/sun.rmi.transport.tcp.TCPTransport.handleMessages(TCPTransport.java:543)
+	at java.rmi/sun.rmi.transport.tcp.TCPTransport$ConnectionHandler.run0(TCPTransport.java:744)
+	at java.rmi/sun.rmi.transport.tcp.TCPTransport$ConnectionHandler.run(TCPTransport.java:623)
+	at java.base/java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1090)
+	at java.base/java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:614)
+	at java.base/java.lang.Thread.run(Thread.java:1516)
+
+
diff --git a/LICENSE b/LICENSE
new file mode 100644
index 0000000..b4ac81f
--- /dev/null
+++ b/LICENSE
@@ -0,0 +1,21 @@
+MIT License
+
+Copyright (c) 2026 Timemachine
+
+Permission is hereby granted, free of charge, to any person obtaining a copy
+of this software and associated documentation files (the "Software"), to deal
+in the Software without restriction, including without limitation the rights
+to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+copies of the Software, and to permit persons to whom the Software is
+furnished to do so, subject to the following conditions:
+
+The above copyright notice and this permission notice shall be included in all
+copies or substantial portions of the Software.
+
+THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
+SOFTWARE.
diff --git a/README.md b/README.md
new file mode 100644
index 0000000..8303f37
--- /dev/null
+++ b/README.md
@@ -0,0 +1,81 @@
+# cloud-installer
+
+Single-jar Kotlin client for [`cloud-svc`](https://git.timemachine.center/Timemachine/cloud-svc). Drops into Prism / MMC / ATLauncher / frazclient pre-launch + post-exit hooks alongside [`packwiz-installer-bootstrap`](https://github.com/packwiz/packwiz-installer-bootstrap). One tool, all launchers, no Python dependency on the client side.
+
+## Status
+
+**Skeleton.** Build works, jar runs, CLI parses subcommands. Real sync logic + conflict UI land in subsequent commits. See [`DESIGN.md` in cloud-svc](https://git.timemachine.center/Timemachine/cloud-svc/src/branch/main/DESIGN.md) for the underlying contract this jar implements.
+
+## Usage (planned)
+
+In Prism's instance settings → Custom commands:
+
+```
+Pre-launch command:
+  "$INST_JAVA" -jar /path/to/cloud-installer.jar pull \
+      --url=https://cloud.timemachine.center \
+      --pack-folder=$INST_MC_DIR
+
+Post-exit command:
+  "$INST_JAVA" -jar /path/to/cloud-installer.jar push \
+      --url=https://cloud.timemachine.center \
+      --pack-folder=$INST_MC_DIR
+```
+
+Token comes from `$INST_MC_DIR/.cloud-token` (paste once from your Discord-bot DM), `--token <STR>`, or `CLOUD_TOKEN` env.
+
+## CLI
+
+```
+java -jar cloud-installer.jar <subcommand> [flags]
+
+Subcommands:
+  pull     Fetch user's cloud state, apply conflict resolution, write to instance.
+  push     Walk instance, build snapshot, upload changed files.
+
+Flags:
+  --url <URL>           cloud-svc base URL (required)
+  --pack-folder <DIR>   instance dir to sync into/from (default: ".")
+  --token <STR>         bearer token (or use --token-file)
+  --token-file <PATH>   read token from this file (default: <pack-folder>/.cloud-token)
+  -g, --no-gui          headless mode; conflicts auto-resolve to remote-wins
+  -V, --version         print version
+  -h, --help            print this help
+```
+
+## Build
+
+Requires JDK 17–21 (JDK 26 currently breaks Kotlin 2.1's compiler). Easiest: containerized via podman/docker.
+
+```bash
+podman run --rm -v "$PWD":/work:Z -w /work docker.io/gradle:8.10.2-jdk21 \
+    gradle --no-daemon shadowJar
+```
+
+Output: `build/libs/cloud-installer-<version>.jar`. Single fat jar; ship as-is.
+
+For local development with a matching JDK installed:
+
+```bash
+./gradlew shadowJar
+```
+
+## UI
+
+Swing + [FlatLaf](https://www.formdev.com/flatlaf/) (`FlatMacDarkLaf` theme). Closest visual match to Prism's Qt look in pure Java. Falls back to system look-and-feel if FlatLaf init fails (e.g., on bare-bones X servers).
+
+Conflict resolution dialog: per-file [keep local | use remote | skip] radio buttons + "use all local/remote" + Cancel/Continue. Headless mode (`-g`) defaults all conflicts to remote-wins (Steam's default).
+
+## Where this fits in the automc stack
+
+| Tool | What it owns |
+|---|---|
+| **packwiz-installer-bootstrap** | Mod sync — jars, configs shipped by the modpack, options.txt baseline |
+| **cloud-installer** (this) | Per-user sync — player-modified configs, JourneyMap waypoints, screenshots |
+| **frazclient** | Cracked-launcher orchestration — JDK, vanilla MC, Fabric, then invokes both jars |
+
+cloud-installer and packwiz-installer-bootstrap are deliberately **separate jars** so players can disable cloud sync without affecting modpack sync (or vice versa) by just commenting out the line in Prism's hook config.
+
+## License
+
+MIT.
diff --git a/build.gradle.kts b/build.gradle.kts
new file mode 100644
index 0000000..d4abed7
--- /dev/null
+++ b/build.gradle.kts
@@ -0,0 +1,61 @@
+plugins {
+    kotlin("jvm") version "2.1.0"
+    kotlin("plugin.serialization") version "2.1.0"
+    id("com.gradleup.shadow") version "8.3.5"
+    application
+}
+
+group = "center.timemachine.cloud"
+version = "0.1.0"
+
+repositories {
+    mavenCentral()
+}
+
+dependencies {
+    // FlatLaf gives us an IntelliJ-style dark theme on Swing —
+    // closest visual match to Prism Launcher's Qt look in pure Java.
+    implementation("com.formdev:flatlaf:3.5.4")
+    implementation("com.formdev:flatlaf-intellij-themes:3.5.4")
+
+    // JSON via Kotlin's official lib; supports kotlin data classes natively.
+    implementation("org.jetbrains.kotlinx:kotlinx-serialization-json:1.7.3")
+
+    testImplementation(kotlin("test"))
+    testImplementation("org.jetbrains.kotlinx:kotlinx-coroutines-test:1.10.2")
+}
+
+// Target Java 17 bytecode using whatever JDK is installed locally (we
+// require >= 17). Avoids the Gradle toolchain auto-provisioning dance,
+// at the cost of needing a manual JDK 17+ on dev machines and CI runners.
+kotlin {
+    compilerOptions {
+        jvmTarget.set(org.jetbrains.kotlin.gradle.dsl.JvmTarget.JVM_17)
+    }
+}
+
+java {
+    sourceCompatibility = JavaVersion.VERSION_17
+    targetCompatibility = JavaVersion.VERSION_17
+}
+
+application {
+    mainClass.set("center.timemachine.cloud.MainKt")
+}
+
+tasks.test {
+    useJUnitPlatform()
+}
+
+tasks.shadowJar {
+    archiveBaseName.set("cloud-installer")
+    archiveClassifier.set("")
+    archiveVersion.set(project.version.toString())
+    mergeServiceFiles()
+}
+
+// Defer to shadowJar for the canonical artifact; the default 'jar' task
+// produces a thin jar without dependencies which would be useless to ship.
+tasks.jar {
+    enabled = false
+}
diff --git a/gradle/wrapper/gradle-wrapper.jar b/gradle/wrapper/gradle-wrapper.jar
new file mode 100644
index 0000000..a4b76b9
Binary files /dev/null and b/gradle/wrapper/gradle-wrapper.jar differ
diff --git a/gradle/wrapper/gradle-wrapper.properties b/gradle/wrapper/gradle-wrapper.properties
new file mode 100644
index 0000000..475cfde
--- /dev/null
+++ b/gradle/wrapper/gradle-wrapper.properties
@@ -0,0 +1,7 @@
+distributionBase=GRADLE_USER_HOME
+distributionPath=wrapper/dists
+distributionUrl=https\://services.gradle.org/distributions/gradle-8.10.2-bin.zip
+zipStoreBase=GRADLE_USER_HOME
+zipStorePath=wrapper/dists
+networkTimeout=10000
+validateDistributionUrl=true
diff --git a/gradlew b/gradlew
new file mode 100755
index 0000000..d95bf61
--- /dev/null
+++ b/gradlew
@@ -0,0 +1,252 @@
+#!/bin/sh
+
+#
+# Copyright © 2015-2021 the original authors.
+#
+# Licensed under the Apache License, Version 2.0 (the "License");
+# you may not use this file except in compliance with the License.
+# You may obtain a copy of the License at
+#
+#      https://www.apache.org/licenses/LICENSE-2.0
+#
+# Unless required by applicable law or agreed to in writing, software
+# distributed under the License is distributed on an "AS IS" BASIS,
+# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+# See the License for the specific language governing permissions and
+# limitations under the License.
+#
+# SPDX-License-Identifier: Apache-2.0
+#
+
+##############################################################################
+#
+#   Gradle start up script for POSIX generated by Gradle.
+#
+#   Important for running:
+#
+#   (1) You need a POSIX-compliant shell to run this script. If your /bin/sh is
+#       noncompliant, but you have some other compliant shell such as ksh or
+#       bash, then to run this script, type that shell name before the whole
+#       command line, like:
+#
+#           ksh Gradle
+#
+#       Busybox and similar reduced shells will NOT work, because this script
+#       requires all of these POSIX shell features:
+#         * functions;
+#         * expansions «$var», «${var}», «${var:-default}», «${var+SET}»,
+#           «${var#prefix}», «${var%suffix}», and «$( cmd )»;
+#         * compound commands having a testable exit status, especially «case»;
+#         * various built-in commands including «command», «set», and «ulimit».
+#
+#   Important for patching:
+#
+#   (2) This script targets any POSIX shell, so it avoids extensions provided
+#       by Bash, Ksh, etc; in particular arrays are avoided.
+#
+#       The "traditional" practice of packing multiple parameters into a
+#       space-separated string is a well documented source of bugs and security
+#       problems, so this is (mostly) avoided, by progressively accumulating
+#       options in "$@", and eventually passing that to Java.
+#
+#       Where the inherited environment variables (DEFAULT_JVM_OPTS, JAVA_OPTS,
+#       and GRADLE_OPTS) rely on word-splitting, this is performed explicitly;
+#       see the in-line comments for details.
+#
+#       There are tweaks for specific operating systems such as AIX, CygWin,
+#       Darwin, MinGW, and NonStop.
+#
+#   (3) This script is generated from the Groovy template
+#       https://github.com/gradle/gradle/blob/HEAD/platforms/jvm/plugins-application/src/main/resources/org/gradle/api/internal/plugins/unixStartScript.txt
+#       within the Gradle project.
+#
+#       You can find Gradle at https://github.com/gradle/gradle/.
+#
+##############################################################################
+
+# Attempt to set APP_HOME
+
+# Resolve links: $0 may be a link
+app_path=$0
+
+# Need this for daisy-chained symlinks.
+while
+    APP_HOME=${app_path%"${app_path##*/}"}  # leaves a trailing /; empty if no leading path
+    [ -h "$app_path" ]
+do
+    ls=$( ls -ld "$app_path" )
+    link=${ls#*' -> '}
+    case $link in             #(
+      /*)   app_path=$link ;; #(
+      *)    app_path=$APP_HOME$link ;;
+    esac
+done
+
+# This is normally unused
+# shellcheck disable=SC2034
+APP_BASE_NAME=${0##*/}
+# Discard cd standard output in case $CDPATH is set (https://github.com/gradle/gradle/issues/25036)
+APP_HOME=$( cd -P "${APP_HOME:-./}" > /dev/null && printf '%s
+' "$PWD" ) || exit
+
+# Use the maximum available, or set MAX_FD != -1 to use that value.
+MAX_FD=maximum
+
+warn () {
+    echo "$*"
+} >&2
+
+die () {
+    echo
+    echo "$*"
+    echo
+    exit 1
+} >&2
+
+# OS specific support (must be 'true' or 'false').
+cygwin=false
+msys=false
+darwin=false
+nonstop=false
+case "$( uname )" in                #(
+  CYGWIN* )         cygwin=true  ;; #(
+  Darwin* )         darwin=true  ;; #(
+  MSYS* | MINGW* )  msys=true    ;; #(
+  NONSTOP* )        nonstop=true ;;
+esac
+
+CLASSPATH=$APP_HOME/gradle/wrapper/gradle-wrapper.jar
+
+
+# Determine the Java command to use to start the JVM.
+if [ -n "$JAVA_HOME" ] ; then
+    if [ -x "$JAVA_HOME/jre/sh/java" ] ; then
+        # IBM's JDK on AIX uses strange locations for the executables
+        JAVACMD=$JAVA_HOME/jre/sh/java
+    else
+        JAVACMD=$JAVA_HOME/bin/java
+    fi
+    if [ ! -x "$JAVACMD" ] ; then
+        die "ERROR: JAVA_HOME is set to an invalid directory: $JAVA_HOME
+
+Please set the JAVA_HOME variable in your environment to match the
+location of your Java installation."
+    fi
+else
+    JAVACMD=java
+    if ! command -v java >/dev/null 2>&1
+    then
+        die "ERROR: JAVA_HOME is not set and no 'java' command could be found in your PATH.
+
+Please set the JAVA_HOME variable in your environment to match the
+location of your Java installation."
+    fi
+fi
+
+# Increase the maximum file descriptors if we can.
+if ! "$cygwin" && ! "$darwin" && ! "$nonstop" ; then
+    case $MAX_FD in #(
+      max*)
+        # In POSIX sh, ulimit -H is undefined. That's why the result is checked to see if it worked.
+        # shellcheck disable=SC2039,SC3045
+        MAX_FD=$( ulimit -H -n ) ||
+            warn "Could not query maximum file descriptor limit"
+    esac
+    case $MAX_FD in  #(
+      '' | soft) :;; #(
+      *)
+        # In POSIX sh, ulimit -n is undefined. That's why the result is checked to see if it worked.
+        # shellcheck disable=SC2039,SC3045
+        ulimit -n "$MAX_FD" ||
+            warn "Could not set maximum file descriptor limit to $MAX_FD"
+    esac
+fi
+
+# Collect all arguments for the java command, stacking in reverse order:
+#   * args from the command line
+#   * the main class name
+#   * -classpath
+#   * -D...appname settings
+#   * --module-path (only if needed)
+#   * DEFAULT_JVM_OPTS, JAVA_OPTS, and GRADLE_OPTS environment variables.
+
+# For Cygwin or MSYS, switch paths to Windows format before running java
+if "$cygwin" || "$msys" ; then
+    APP_HOME=$( cygpath --path --mixed "$APP_HOME" )
+    CLASSPATH=$( cygpath --path --mixed "$CLASSPATH" )
+
+    JAVACMD=$( cygpath --unix "$JAVACMD" )
+
+    # Now convert the arguments - kludge to limit ourselves to /bin/sh
+    for arg do
+        if
+            case $arg in                                #(
+              -*)   false ;;                            # don't mess with options #(
+              /?*)  t=${arg#/} t=/${t%%/*}              # looks like a POSIX filepath
+                    [ -e "$t" ] ;;                      #(
+              *)    false ;;
+            esac
+        then
+            arg=$( cygpath --path --ignore --mixed "$arg" )
+        fi
+        # Roll the args list around exactly as many times as the number of
+        # args, so each arg winds up back in the position where it started, but
+        # possibly modified.
+        #
+        # NB: a `for` loop captures its iteration list before it begins, so
+        # changing the positional parameters here affects neither the number of
+        # iterations, nor the values presented in `arg`.
+        shift                   # remove old arg
+        set -- "$@" "$arg"      # push replacement arg
+    done
+fi
+
+
+# Add default JVM options here. You can also use JAVA_OPTS and GRADLE_OPTS to pass JVM options to this script.
+DEFAULT_JVM_OPTS='-Dfile.encoding=UTF-8 "-Xmx64m" "-Xms64m"'
+
+# Collect all arguments for the java command:
+#   * DEFAULT_JVM_OPTS, JAVA_OPTS, JAVA_OPTS, and optsEnvironmentVar are not allowed to contain shell fragments,
+#     and any embedded shellness will be escaped.
+#   * For example: A user cannot expect ${Hostname} to be expanded, as it is an environment variable and will be
+#     treated as '${Hostname}' itself on the command line.
+
+set -- \
+        "-Dorg.gradle.appname=$APP_BASE_NAME" \
+        -classpath "$CLASSPATH" \
+        org.gradle.wrapper.GradleWrapperMain \
+        "$@"
+
+# Stop when "xargs" is not available.
+if ! command -v xargs >/dev/null 2>&1
+then
+    die "xargs is not available"
+fi
+
+# Use "xargs" to parse quoted args.
+#
+# With -n1 it outputs one arg per line, with the quotes and backslashes removed.
+#
+# In Bash we could simply go:
+#
+#   readarray ARGS < <( xargs -n1 <<<"$var" ) &&
+#   set -- "${ARGS[@]}" "$@"
+#
+# but POSIX shell has neither arrays nor command substitution, so instead we
+# post-process each arg (as a line of input to sed) to backslash-escape any
+# character that might be a shell metacharacter, then use eval to reverse
+# that process (while maintaining the separation between arguments), and wrap
+# the whole thing up as a single "set" statement.
+#
+# This will of course break if any of these variables contains a newline or
+# an unmatched quote.
+#
+
+eval "set -- $(
+        printf '%s\n' "$DEFAULT_JVM_OPTS $JAVA_OPTS $GRADLE_OPTS" |
+        xargs -n1 |
+        sed ' s~[^-[:alnum:]+,./:=@_]~\\&~g; ' |
+        tr '\n' ' '
+    )" '"$@"'
+
+exec "$JAVACMD" "$@"
diff --git a/gradlew.bat b/gradlew.bat
new file mode 100644
index 0000000..640d686
--- /dev/null
+++ b/gradlew.bat
@@ -0,0 +1,94 @@
+@rem
+@rem Copyright 2015 the original author or authors.
+@rem
+@rem Licensed under the Apache License, Version 2.0 (the "License");
+@rem you may not use this file except in compliance with the License.
+@rem You may obtain a copy of the License at
+@rem
+@rem      https://www.apache.org/licenses/LICENSE-2.0
+@rem
+@rem Unless required by applicable law or agreed to in writing, software
+@rem distributed under the License is distributed on an "AS IS" BASIS,
+@rem WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+@rem See the License for the specific language governing permissions and
+@rem limitations under the License.
+@rem
+@rem SPDX-License-Identifier: Apache-2.0
+@rem
+
+@if "%DEBUG%"=="" @echo off
+@rem ##########################################################################
+@rem
+@rem  Gradle startup script for Windows
+@rem
+@rem ##########################################################################
+
+@rem Set local scope for the variables with windows NT shell
+if "%OS%"=="Windows_NT" setlocal
+
+set DIRNAME=%~dp0
+if "%DIRNAME%"=="" set DIRNAME=.
+@rem This is normally unused
+set APP_BASE_NAME=%~n0
+set APP_HOME=%DIRNAME%
+
+@rem Resolve any "." and ".." in APP_HOME to make it shorter.
+for %%i in ("%APP_HOME%") do set APP_HOME=%%~fi
+
+@rem Add default JVM options here. You can also use JAVA_OPTS and GRADLE_OPTS to pass JVM options to this script.
+set DEFAULT_JVM_OPTS=-Dfile.encoding=UTF-8 "-Xmx64m" "-Xms64m"
+
+@rem Find java.exe
+if defined JAVA_HOME goto findJavaFromJavaHome
+
+set JAVA_EXE=java.exe
+%JAVA_EXE% -version >NUL 2>&1
+if %ERRORLEVEL% equ 0 goto execute
+
+echo. 1>&2
+echo ERROR: JAVA_HOME is not set and no 'java' command could be found in your PATH. 1>&2
+echo. 1>&2
+echo Please set the JAVA_HOME variable in your environment to match the 1>&2
+echo location of your Java installation. 1>&2
+
+goto fail
+
+:findJavaFromJavaHome
+set JAVA_HOME=%JAVA_HOME:"=%
+set JAVA_EXE=%JAVA_HOME%/bin/java.exe
+
+if exist "%JAVA_EXE%" goto execute
+
+echo. 1>&2
+echo ERROR: JAVA_HOME is set to an invalid directory: %JAVA_HOME% 1>&2
+echo. 1>&2
+echo Please set the JAVA_HOME variable in your environment to match the 1>&2
+echo location of your Java installation. 1>&2
+
+goto fail
+
+:execute
+@rem Setup the command line
+
+set CLASSPATH=%APP_HOME%\gradle\wrapper\gradle-wrapper.jar
+
+
+@rem Execute Gradle
+"%JAVA_EXE%" %DEFAULT_JVM_OPTS% %JAVA_OPTS% %GRADLE_OPTS% "-Dorg.gradle.appname=%APP_BASE_NAME%" -classpath "%CLASSPATH%" org.gradle.wrapper.GradleWrapperMain %*
+
+:end
+@rem End local scope for the variables with windows NT shell
+if %ERRORLEVEL% equ 0 goto mainEnd
+
+:fail
+rem Set variable GRADLE_EXIT_CONSOLE if you need the _script_ return code instead of
+rem the _cmd.exe /c_ return code!
+set EXIT_CODE=%ERRORLEVEL%
+if %EXIT_CODE% equ 0 set EXIT_CODE=1
+if not ""=="%GRADLE_EXIT_CONSOLE%" exit %EXIT_CODE%
+exit /b %EXIT_CODE%
+
+:mainEnd
+if "%OS%"=="Windows_NT" endlocal
+
+:omega
diff --git a/settings.gradle.kts b/settings.gradle.kts
new file mode 100644
index 0000000..caa2620
--- /dev/null
+++ b/settings.gradle.kts
@@ -0,0 +1 @@
+rootProject.name = "cloud-installer"
diff --git a/src/main/kotlin/center/timemachine/cloud/Cli.kt b/src/main/kotlin/center/timemachine/cloud/Cli.kt
new file mode 100644
index 0000000..4d64787
--- /dev/null
+++ b/src/main/kotlin/center/timemachine/cloud/Cli.kt
@@ -0,0 +1,20 @@
+package center.timemachine.cloud
+
+/**
+ * Subcommand dispatchers. Skeleton — real arg parsing + sync logic lands
+ * in subsequent tasks. For now these print intent and exit cleanly so the
+ * fat jar can be smoke-tested end-to-end through Prism / frazclient.
+ */
+object Cli {
+    fun runPull(args: Array<String>): Int {
+        println("cloud-installer pull: ${args.joinToString(" ")}")
+        println("(not yet implemented; skeleton commit only)")
+        return 0
+    }
+
+    fun runPush(args: Array<String>): Int {
+        println("cloud-installer push: ${args.joinToString(" ")}")
+        println("(not yet implemented; skeleton commit only)")
+        return 0
+    }
+}
diff --git a/src/main/kotlin/center/timemachine/cloud/Main.kt b/src/main/kotlin/center/timemachine/cloud/Main.kt
new file mode 100644
index 0000000..4aef6ce
--- /dev/null
+++ b/src/main/kotlin/center/timemachine/cloud/Main.kt
@@ -0,0 +1,74 @@
+package center.timemachine.cloud
+
+import com.formdev.flatlaf.themes.FlatMacDarkLaf
+import javax.swing.UIManager
+
+/**
+ * cloud-installer entrypoint.
+ *
+ * Invoked twice in the launcher hooks:
+ *   PreLaunch:  java -jar cloud-installer.jar pull  --url=... --pack-folder=...
+ *   PostExit:   java -jar cloud-installer.jar push  --url=... --pack-folder=...
+ *
+ * Exit codes:
+ *   0  ok
+ *   1  user cancelled
+ *   2  error
+ */
+fun main(args: Array<String>) {
+    if (args.isEmpty() || args[0] in listOf("-h", "--help", "help")) {
+        printHelp()
+        return
+    }
+    if (args[0] in listOf("--version", "-V")) {
+        println("cloud-installer 0.1.0")
+        return
+    }
+
+    // Install FlatLaf theme as early as possible so any Swing window
+    // we open later picks it up. Falls back to system L&F on failure.
+    try {
+        UIManager.setLookAndFeel(FlatMacDarkLaf())
+    } catch (e: Exception) {
+        System.err.println("note: FlatLaf init failed (${e.message}); using system L&F")
+    }
+
+    val subcommand = args[0]
+    val rest = args.drop(1).toTypedArray()
+
+    val rc = when (subcommand) {
+        "pull" -> Cli.runPull(rest)
+        "push" -> Cli.runPush(rest)
+        else -> {
+            System.err.println("unknown subcommand: $subcommand")
+            printHelp()
+            2
+        }
+    }
+    kotlin.system.exitProcess(rc)
+}
+
+private fun printHelp() {
+    println("""
+        cloud-installer — per-user state sync for Minecraft clients
+
+        Usage:
+          java -jar cloud-installer.jar <subcommand> [flags]
+
+        Subcommands:
+          pull     Fetch user's cloud state, apply conflict resolution, write to instance.
+          push     Walk instance, build snapshot, upload changed files.
+
+        Flags:
+          --url <URL>           cloud-svc base URL (required)
+          --pack-folder <DIR>   instance dir to sync into/from (default: ".")
+          --token <STR>         bearer token (or use --token-file)
+          --token-file <PATH>   read token from this file (default: <pack-folder>/.cloud-token)
+          -g, --no-gui          headless mode; conflicts auto-resolve to remote-wins
+          -V, --version         print version
+          -h, --help            print this help
+
+        Environment:
+          CLOUD_TOKEN           fallback token source if no flag and no file
+    """.trimIndent())
+}
diff --git a/src/test/kotlin/center/timemachine/cloud/SmokeTest.kt b/src/test/kotlin/center/timemachine/cloud/SmokeTest.kt
new file mode 100644
index 0000000..6fbb2df
--- /dev/null
+++ b/src/test/kotlin/center/timemachine/cloud/SmokeTest.kt
@@ -0,0 +1,16 @@
+package center.timemachine.cloud
+
+import kotlin.test.Test
+import kotlin.test.assertEquals
+
+class SmokeTest {
+    @Test
+    fun `cli pull returns 0 in skeleton`() {
+        assertEquals(0, Cli.runPull(arrayOf("--url=http://localhost:9091")))
+    }
+
+    @Test
+    fun `cli push returns 0 in skeleton`() {
+        assertEquals(0, Cli.runPush(arrayOf("--url=http://localhost:9091")))
+    }
+}