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Migrates Inera intyg Java apps from Spring Boot 3.5.x / Gradle 8.14.x / Jackson 2 to Spring Boot 4.1.0 / Gradle 9.6.0 / Jackson 3 using phased, verifiable steps. Use when lifecycle migration, Java 25 upgrade, intyg-bom bump, Jackson 3 migration, Gradle 9 upgrade, or Spring Boot 4 migration is requested for intyg projects.

Execute a detailed, sub-stepped implementation plan (such as migration/detailed-plan-step-13.md) safely, thoroughly, and verifiably. Use this when following a multi-step migration or refactoring plan where completeness, ordering, and continuous verification matter — and where the result must be a runnable, deployable application.

Refactor a Spring Boot application's configuration from legacy application.properties and scattered @Value usage to structured YAML and immutable @ConfigurationProperties records. Use this when migrating messy configuration, standardizing property naming, introducing app-prefixed custom properties, or separating sensible defaults from local development overrides.

Scaffold or restructure a Spring Boot application's @Configuration classes, module layout, profile strategy, and infrastructure wiring. Use this when setting up a new Spring Boot service, reorganizing an existing one, adding modules, or aligning project structure with production-grade patterns for Kubernetes deployment.