ADR-003: Monolith-first backend
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Substantially revised 2026-06-20: adds the by-domain folder layout, the three-tier contract model, interface/adapter naming, the service+adapters layering, the error model, and principal handling.
Companion to ADR-020 (which covers the contract tiers, structure, naming, and layering).
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End-to-end guide from Protobuf schema to Kotlin handler to TypeScript client
Start the Kotlin backend locally with Gradle, configure database access, and verify the health endpoint
Auto-generated Kotlin/JVM API documentation from Dokka