Add decompile runner workflow

AGENTS.md

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+# Agent Instructions
+
+## Project
+
+Explosion Overhaul private NeoForge port.
+
+## Repository Rules
+
+- This repository is for a private 1.21.1 NeoForge port of Explosion Overhaul.
+- Do not publish the decompiled upstream source or release artifacts publicly unless the original author grants permission.
+- Use the Gitea runner for Java/Gradle/decompiler work when local Java is unavailable.
+- Preserve unrelated user changes.
+- Do not commit secrets, `.env` files, private keys, certificates, or tokens.
+- Do not create a public release unless explicitly requested.
+
+## Commands
+
+Use these commands when the NeoForge project is present:
+
+```bash
+./gradlew build
+./gradlew runClient
+```
+
+On Windows:
+
+```bat
+gradlew.bat build
+gradlew.bat runClient
+```
+
+## Artifacts
+
+Expected mod jars will be produced in:
+
+```text
+build/libs
+```
+
+## Runner
+
+The workflow `.gitea/workflows/decompile.yml` decompiles the upstream 1.20.1 Forge jar into an Actions artifact. Use it before reconstructing the NeoForge source tree.