java-usages, kotlin-bridge and the patched Lombok agent are JDT LS bundles and a Java agent embedded into the app, not OpenIDEA plugins. Move them to java/ so plugins/ holds only plugins, and update the paths that embed or mention them.
Also fix the stale build path in the hello fixture and the contributor guide's layout (there is no templates/ directory; starter templates live in the openidea-plugin CLI).
Refactor | Pull Members Up… and Push Members Down… for Java, from the Refactor menu, the editor context menu and Refactor This. A dialog picks the destination and the members (Make abstract / Keep abstract); problems are confirmed before anything changes; the edit is applied as one change or previewed first.
JDT LS offers neither as a code action, so the app-owned JDT LS bundle (plugins/java-usages 1.3.0) adds two delegate commands that run JDT's PullUpRefactoringProcessor / PushDownRefactoringProcessor and return the problems and the edit without applying it, exposed as lsp_hierarchy_members / lsp_hierarchy_refactor (also over the remote host dispatcher). The bundled jar was rebuilt from source with JDT LS 1.63.0 and matches the recorded SHA-256.
Co-authored-by: fhrmrk <81476595+fhrmrk@users.noreply.github.com>