Add decompile runner workflow

.codex/project.md

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+# Codex Project Notes
+
+## Project
+
+`Explosion Overhaul` is a private porting workspace for moving the upstream Forge 1.20.1 mod `Explosion Overhaul: A new level of destruction` to NeoForge `21.1.228` for Minecraft `1.21.1`.
+
+Repository:
+
+```text
+MrSphay/Explosion-Overhaul
+```
+
+## Commands
+
+Local Java is not available in the current Codex environment, so Java tasks should run on the Gitea runner until a local JDK is configured.
+
+Planned commands:
+
+```text
+./gradlew build
+./gradlew runClient
+```
+
+Windows equivalents:
+
+```text
+gradlew.bat build
+gradlew.bat runClient
+```
+
+## Stack
+
+Minecraft mod, Java 21, NeoForge `21.1.228`, Minecraft `1.21.1`.
+
+## Build Artifacts
+
+Release artifacts are produced in:
+
+```text
+build/libs
+```
+
+Expected files:
+
+```text
+explosionoverhaul-*.jar
+```
+
+## Security And License Rules
+
+- Treat the decompiled upstream source as private porting material.
+- Do not publish or redistribute the port without permission from the original author.
+- Keep tokens and registry credentials out of the repository.
+- External network calls currently used by runner workflows:
+  - Modrinth CDN for the upstream jar.
+  - CFR website for the decompiler jar.
+
+## Current Porting State
+
+The cloned repository initially contained the Codex Agent Repository Kit, not mod source. The first runner step is `.gitea/workflows/decompile.yml`, which creates a decompiled-source artifact for reconstruction.

.gitea/workflows/decompile.yml

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+name: Decompile upstream jar
+
+on:
+  workflow_dispatch:
+
+jobs:
+  decompile:
+    runs-on: ubuntu-latest
+    steps:
+      - name: Checkout
+        uses: actions/checkout@v4
+
+      - name: Setup Java
+        uses: actions/setup-java@v4
+        with:
+          distribution: temurin
+          java-version: '21'
+
+      - name: Download upstream mod and CFR
+        shell: bash
+        run: |
+          mkdir -p upstream tools build/decompiled
+          curl --fail-with-body --location \
+            --output upstream/Explosion-Overhaul-0.2.3.0-forge.jar \
+            "https://cdn.modrinth.com/data/sOxnTLKl/versions/93XGK0uB/Explosion-Overhaul-0.2.3.0-forge-.jar"
+          curl --fail-with-body --location \
+            --output tools/cfr.jar \
+            "https://www.benf.org/other/cfr/cfr-0.152.jar"
+
+      - name: Decompile
+        shell: bash
+        run: |
+          java -jar tools/cfr.jar upstream/Explosion-Overhaul-0.2.3.0-forge.jar \
+            --outputdir build/decompiled \
+            --silent false \
+            --comments false \
+            --caseinsensitivefs true
+
+      - name: Copy metadata
+        shell: bash
+        run: |
+          unzip -p upstream/Explosion-Overhaul-0.2.3.0-forge.jar META-INF/mods.toml > build/decompiled/mods.toml
+          unzip -p upstream/Explosion-Overhaul-0.2.3.0-forge.jar explosionoverhaul.mixins.json > build/decompiled/explosionoverhaul.mixins.json
+          find build/decompiled -maxdepth 3 -type f | sort > build/decompiled-file-list.txt
+
+      - name: Upload decompiled sources
+        uses: actions/upload-artifact@v3
+        with:
+          name: explosion-overhaul-decompiled-0.2.3.0-forge
+          path: |
+            build/decompiled/**
+            build/decompiled-file-list.txt

.gitignore

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+.gradle/
+build/
+run/
+out/
+
+_mdk/
+tools/
+upstream/
+decompiled/
+
+*.class
+*.jar
+*.log
+
+.idea/
+.vscode/
+*.iml

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.