Fix breaking class identity and cast issues

[Xytronix]

Summary

Shared runtime dependencies are delegated to the parent app classloader. Without this, Hyinit could load its own duplicate copies of ASM/SpongePowered/mixinextras classes, which breaks class identity and causes cast issues with IMixinConfigPlugin.

Also hardens plugin-class loading for malformed early plugin jars by guarding against loadLocalClass being called with a null class name. This prevents a null name from reaching getClassLoadingLock and triggering an NPE path.

Type of change

• Bug fix (non-breaking)
• New feature (non-breaking)
• Breaking change (requires documentation/migration)
• Chore / refactor
• Documentation only

Implementation details

• Updated HyinitClassLoader to add isParentDelegated checks in loadClass.
  • Delegates these package prefixes to the parent classloader:
    • org.objectweb.asm.
    • org.spongepowered.asm.
    • com.llamalad7.mixinextras.
  • This avoids defining duplicate copies of bundled libraries and preserves a single class identity.
• Updated MixinPluginClassLoader with a HEAD mixin injection on loadLocalClass that:
  • Detects name == null
  • Logs a warning (HyinitLogger)
  • Returns null early
  • Avoids downstream ConcurrentHashMap.putIfAbsent null handling crash paths.
• Key files:
  • src/main/java/cc/irori/hyinit/mixin/HyinitClassLoader.java
  • src/main/java/cc/irori/hyinit/mixin/impl/MixinPluginClassLoader.java

Checklist

• Code compiles successfully
• Pull request does not contain unrelated changes
• Changes follow this project's code style (Use spotlessApply when necessary)
• Changes are tested or will be tested after submission

Additional Info

PR required for Refixes PR associated to it.