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docs/architecture.md

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+# Architecture
+
+`sonar-test-go` is a `go` service.
+
+| Component | Detail |
+|-----------|--------|
+| Runtime | `go` |
+| Container port | `8080` |
+| Health check | `/health` |
+| Metrics | `/metrics` (Prometheus format) |
+| Image | Azure Container Registry (`bstagecjotdevacr`) |
+
+## Deployment flow
+
+```
+Push to dev/staging/prod
+  → build-push.yml  (build + test → push image to ACR)
+  → deploy-humanitec.yml (hctl score deploy)
+```
+
+## Branch model
+
+| Branch | Purpose |
+|--------|---------|
+| `main` | System of record — catalog, docs, score.yaml, platform config |
+| `dev` | Active development |
+| `staging` | Pre-production (lazy-created on first promote) |
+| `prod` | Production (lazy-created on first promote) |
+
+Promotions between environments are triggered from the Backstage CI/CD tab.