JetBrains/kotlin ? reverse-engineered prompt

I want you to get this Kotlin project building and running cleanly from a fresh checkout.

Please read the repo docs, set up whatever JDKs and Gradle settings are needed, then run the main build and the important tests. If anything fails, fix the issues in the code or build files instead of just explaining them. I’d like the compiler, standard library, and Gradle plugin parts to be in good shape, and I want the usual build outputs to work too.

If you need to look up current Kotlin or Gradle docs online, go ahead. Please keep the changes focused, make sure the project still passes a sensible build after your edits, and tell me what you changed and why at the end.