Add AGENTS.md with Cursor Cloud development environment instructions

AGENTS.md

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+# AGENTS.md
+
+## Cursor Cloud specific instructions
+
+### Project overview
+
+This is a Minecraft Forge mod called "Instant Massive Structures Mod" (IMSM) for Minecraft 1.10.2 with Forge 12.18.0.2007. It uses Gradle 2.7 via the included wrapper and ForgeGradle 2.2-SNAPSHOT.
+
+### Java version requirement
+
+This project **requires Java 8** (OpenJDK 8). Gradle 2.7 and ForgeGradle 2.2 are incompatible with Java 9+. Ensure `JAVA_HOME` is set to `/usr/lib/jvm/java-8-openjdk-amd64` before running any Gradle commands. Java 8 must be the default `java` on `PATH`.
+
+### Development commands
+
+| Task | Command |
+|---|---|
+| Build | `JAVA_HOME=/usr/lib/jvm/java-8-openjdk-amd64 ./gradlew build` |
+| Test | `JAVA_HOME=/usr/lib/jvm/java-8-openjdk-amd64 ./gradlew test` |
+| Lint/Check | `JAVA_HOME=/usr/lib/jvm/java-8-openjdk-amd64 ./gradlew check` |
+| Run Minecraft Client | `JAVA_HOME=/usr/lib/jvm/java-8-openjdk-amd64 DISPLAY=:1 ./gradlew runClient` |
+| Setup workspace (first time) | `JAVA_HOME=/usr/lib/jvm/java-8-openjdk-amd64 ./gradlew setupDecompWorkspace` |
+
+### Known caveats
+
+- **Transient SSL errors**: The ForgeGradle plugin attempts to contact `files.minecraftforge.net` and `export.mcpbot.bspk.rs` on every Gradle invocation. These connections may fail with SSL/connection reset errors. The errors are non-fatal and Gradle tasks will still execute if dependencies are cached from a prior `setupDecompWorkspace` run.
+- **No audio in VM**: The Minecraft client will log OpenAL/ALSA errors about missing sound devices. It falls back to silent mode automatically—this is expected in headless/VM environments.
+- **Asset download 400 errors**: Some Minecraft asset downloads may fail with HTTP 400. These are non-critical (icons, language files) and don't prevent the game from running.
+- **Mapping warning**: `This mapping 'snapshot_20160518' was designed for MC 1.9.4!` is a harmless warning; the mappings work fine for 1.10.2.
+- **Software rendering**: The VM uses `llvmpipe` (Mesa software renderer). Minecraft runs but may be slow. This is sufficient for testing mod loading and structure creation.