Skill para migracoes, modernizacao de legacy e refactors estruturais. Use quando precisar fazer upgrades grandes, extracao incremental, strangler pattern, compatibilidade de transicao e rollout seguro. Trigger em: "migracao de framework", "modernizacao de legacy", "strangler pattern", "refactor estrutural", "upgrade grande", "extracao incremental", "migracao de runtime", "trocar ORM", "rollout incremental de refactor", "migrar para", "spring boot 3", "spring boot 2 para 3", "jakarta migration", "javax para jakarta", "openrewrite", "upgrade spring boot", "migrar jdk 21", "jdk 21 upgrade", "java 21 migration", "spring boot upgrade", "spring 3 migration".