SparkUniverse/Essential-Mod — reverse-engineered prompt

Build me an open source Minecraft Java Edition mod called Essential that focuses on quality of life improvements and can be built from source in a clean, repeatable way.

I want the project set up in Kotlin with Gradle so someone can clone it, initialize submodules, and build jars for supported Minecraft versions and loaders. Include a normal full mod jar, plus a small container style jar that only loads or downloads the latest Essential version on first launch. Make it clear where the built jars end up.

Please include build instructions for all versions and for one specific Minecraft version, and make sure the setup uses the Gradle wrapper instead of requiring people to install Gradle manually. Add notes about needing the right Java versions.

Also add simple checksum verification docs so users can compare a jar in their Minecraft folder with one built from source. Look up current Minecraft modding docs online if you need to.