BREAKING CHANGE: New releases require Java 25/Purpur 26.2 and use purpur-tree-feller-<version>.jar. Runtime TreeFeller identity, data folder, progression and felling/undo behavior are unchanged. Replace the old JAR rather than installing both distributions. The local harness now selects Purpur 2618; its stored worlds and operator/port/RCON settings are preserved. No containers are started by this migration.