Java code generators producing kernel-target output: handlers, services, repositories, sagas, events, Flyway migrations and OpenAPI specs. Single target — Exeris kernel.

The Java code generator as one self-contained jar (ADR-097): exeris-codegen-java and its runtime dependencies, shaded, with CodegenMain as Main-Class. `java -jar` over a metadata directory writes what exeris:generate writes.

Canonical build-time invocation point for the Exeris codegen pipeline. `exeris:generate` runs the kernel-target generators against the processor-emitted DomainMetadata and writes sources into src/main/generated/java (L1).