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backend/README.md

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+# Backend
+
+The backend owns the application API and CAD generation workflow:
+
+- `app/`: HTTP API, jobs, orchestration, and persistence adapters.
+- `agent/`: AI prompts, tools, and skills used by the generation agent.
+- `engine/`: CDSL compiler, sketch solver, and STEP generation runtime.
+- `cdsl_library/`: Official CDSL examples, metadata, and search index.
+- `tests/`: Engine, API, and end-to-end generation tests.
+
+Expected development entrypoint: `app.main:app`, served by Uvicorn.