Develop IntelliJ Platform Plugins

Implement IntelliJ Platform plugin behavior so it loads, stays off the EDT, survives unloading, and passes the platform's own checks. Map every change to a card in the references. Each card gives the definition, Use when and Do not use when conditions, the cost it removes, verification, and a working example from assets/examples/plugin/ (Kotlin and Java, IntelliJ IDEA 2026.2, branch 262, Java 25, IntelliJ Platform Gradle Plugin 2.19.0). Follow the cards instead of recalling APIs: ReadAction.compute is deprecated since 2026.1, yet the SDK threading page still shows it.

Workflow