Create new 1.15 port branch from mc-1.12 baseline

.gitignore

@@ -20,3 +20,6 @@ build
 # other
 eclipse
 run
+
+# Files from Forge MDK
+forge*changelog.txt

AGENTS.md

@@ -0,0 +1,38 @@
+# AGENTS.md
+
+## Cursor Cloud specific instructions
+
+### Project overview
+
+This is a Minecraft Forge mod called "Instant Massive Structures Mod" (IMSM) for Minecraft 1.15.2 with Forge 31.2.57 (branch `mc-1.15`). It uses ForgeGradle 3.0.197 with Gradle 4.10.3.
+
+### Java version requirement
+
+**Java 8** is required. Set `JAVA_HOME=/usr/lib/jvm/java-8-openjdk-amd64` before all Gradle commands.
+
+### Development commands
+
+| Task | Command |
+|---|---|
+| Build | `JAVA_HOME=/usr/lib/jvm/java-8-openjdk-amd64 ./gradlew build` |
+| Run client | `JAVA_HOME=/usr/lib/jvm/java-8-openjdk-amd64 DISPLAY=:1 ./gradlew runClient` |
+| Clean | `JAVA_HOME=/usr/lib/jvm/java-8-openjdk-amd64 ./gradlew clean` |
+
+### Branch layout
+
+| Branch | MC Version | Forge | Build System |
+|---|---|---|---|
+| `master` | 1.10.2 | 12.18.0.2007 | ForgeGradle 2.2, Gradle 2.7 |
+| `mc-1.11` | 1.11.2 | 13.20.1.2386 | ForgeGradle 2.2, Gradle 2.7 |
+| `mc-1.12` | 1.12.2 | 14.23.5.2847 | ForgeGradle 2.3, Gradle 4.9 |
+| `mc-1.15` | 1.15.2 | 31.2.57 | ForgeGradle 3.0.197, Gradle 4.10.3 |
+
+### Known caveats
+
+- **LWJGL3 input in cloud VMs**: MC 1.15+ uses LWJGL3/GLFW for input, which does not respond to `xdotool` or `xte`. The `computerUse` subagent cannot interact with the MC 1.15+ game window. Manual testing via the Desktop pane is the only option, and even that may have trouble with mouse clicks depending on the VM's X11 implementation.
+- **No audio in VM**: Sound initialization fails (OpenAL). The game falls back to silent mode automatically.
+- **Auto-Creative mode**: The mod auto-sets Creative mode when a player joins (for testing convenience). Remove the `onPlayerLogin` handler in `IMSM.java` for production.
+- **`/imsm <structure>` command**: Added for testing. Usage: `/imsm WoodenHouse` places a structure at the player's location. Structure names match filenames in `assets/imsm/structs/` without the `.structure` extension.
+- **Block registration**: Uses reflection to auto-register all static `Block` fields in `IMSM.java` with lowercase registry names. `BlockItem` entries are auto-created for all blocks in the `Structures` item group.
+- **Asset naming**: All blockstate JSONs, model JSONs, texture PNGs, and lang files must be lowercase. Blockstate variant keys use `""` (empty string) not `"normal"`. Texture paths use `block/` not `blocks/`.
+- **Transient HTTPS outages**: The Forge Maven and Maven Central occasionally have SSL connection reset issues in the cloud VM. Retry after a few minutes if Gradle dependency resolution fails.

CREDITS.txt

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+Minecraft Forge: Credits/Thank You
+
+Forge is a set of tools and modifications to the Minecraft base game code to assist 
+mod developers in creating new and exciting content. It has been in development for 
+several years now, but I would like to take this time thank a few people who have 
+helped it along it's way.
+
+First, the people who originally created the Forge projects way back in Minecraft 
+alpha. Eloraam of RedPower, and SpaceToad of Buildcraft, without their acceptiance 
+of me taking over the project, who knows what Minecraft modding would be today.
+
+Secondly, someone who has worked with me, and developed some of the core features
+that allow modding to be as functional, and as simple as it is, cpw. For developing
+FML, which stabelized the client and server modding ecosystem. As well as the base
+loading system that allows us to modify Minecraft's code as elegently as possible.
+
+Mezz, who has stepped up as the issue and pull request manager. Helping to keep me
+sane as well as guiding the community into creating better additions to Forge.
+
+Searge, Bspks, Fesh0r, ProfMobious, and all the rest over on the MCP team {of which 
+I am a part}. For creating some of the core tools needed to make Minecraft modding 
+both possible, and as stable as can be.
+  On that note, here is some specific information of the MCP data we use:
+    * Minecraft Coder Pack (MCP) *
+      Forge Mod Loader and Minecraft Forge have permission to distribute and automatically 
+      download components of MCP and distribute MCP data files. This permission is not 
+      transitive and others wishing to redistribute the Minecraft Forge source independently
+      should seek permission of MCP or remove the MCP data files and request their users 
+      to download MCP separately.
+
+And lastly, the countless community members who have spent time submitting bug reports, 
+pull requests, and just helping out the community in general. Thank you.
+
+--LexManos
+
+=========================================================================
+
+This is Forge Mod Loader.
+
+You can find the source code at all times at https://github.com/MinecraftForge/MinecraftForge/tree/1.12.x/src/main/java/net/minecraftforge/fml
+
+This minecraft mod is a clean open source implementation of a mod loader for minecraft servers
+and minecraft clients.
+
+The code is authored by cpw.
+
+It began by partially implementing an API defined by the client side ModLoader, authored by Risugami.
+http://www.minecraftforum.net/topic/75440-
+This support has been dropped as of Minecraft release 1.7, as Risugami no longer maintains ModLoader.
+
+It also contains suggestions and hints and generous helpings of code from LexManos, author of MinecraftForge.
+http://www.minecraftforge.net/
+
+Additionally, it contains an implementation of topological sort based on that 
+published at http://keithschwarz.com/interesting/code/?dir=topological-sort
+
+It also contains code from the Maven project for performing versioned dependency
+resolution. http://maven.apache.org/
+
+It also contains a partial repackaging of the javaxdelta library from http://sourceforge.net/projects/javaxdelta/
+with credit to it's authors.
+
+Forge Mod Loader downloads components from the Minecraft Coder Pack
+(http://mcp.ocean-labs.de/index.php/Main_Page) with kind permission from the MCP team.
+