WIP autoscaler agent

agent/nix_builder_autoscaler/api.py

@@ -0,0 +1,19 @@
+"""FastAPI application — stub for Plan 04."""
+
+from __future__ import annotations
+
+from fastapi import FastAPI
+
+
+def create_app() -> FastAPI:
+    """Create the FastAPI application.
+
+    Full implementation in Plan 04.
+    """
+    app = FastAPI(title="nix-builder-autoscaler", version="0.1.0")
+
+    @app.get("/health/live")
+    def health_live() -> dict[str, str]:
+        return {"status": "ok"}
+
+    return app