Spring Boot 4 Migration Skill

Migrate Spring Boot 2.7.x applications to 3.5.x, then 3.5.x to 4.x, and stay current across 4.x minor versions, anchored to the official Spring Boot migration guides and release notes for each leg.

Scope: 2.7.x → 3.5.x → 4.x and 4.x Minor Versions

This skill covers three scenarios: