Java 26.2 and 26.3 data package

Built from commit 86ceb82 with data revision 924e26d6b3bb8f97a5d1e73d6190b09879c2e1e2. Includes generated data and types. Build, lint, type checks, and 902 package tests passed. This release packages the reviewed upstream 26.3 data branch for the Mineflayer compatibility fork.