add server/app.py at root

server/app.py

@@ -0,0 +1,46 @@
+"""FastAPI application for the RedVeil Environment."""
+
+try:
+    from openenv.core.env_server.http_server import create_app
+except Exception as e:
+    raise ImportError(
+        "openenv is required. Install with: pip install openenv-core[core]"
+    ) from e
+
+try:
+    from ..models import RedVeilAction, RedVeilObservation
+    from .redveil_environment import RedVeilEnvironment
+except (ModuleNotFoundError, ImportError):
+    from models import RedVeilAction, RedVeilObservation
+    from server.redveil_environment import RedVeilEnvironment
+
+
+# Singleton: OpenEnv calls the factory on every request, so we return
+# the same instance to preserve state across reset() -> step() calls.
+_singleton_env = RedVeilEnvironment()
+
+
+def _env_factory() -> RedVeilEnvironment:
+    return _singleton_env
+
+
+app = create_app(
+    _env_factory,
+    RedVeilAction,
+    RedVeilObservation,
+    env_name="redveil",
+    max_concurrent_envs=4,
+)
+
+
+def main(host: str = "0.0.0.0", port: int = 8000):
+    import uvicorn
+    uvicorn.run(app, host=host, port=port)
+
+
+if __name__ == "__main__":
+    import argparse
+    parser = argparse.ArgumentParser()
+    parser.add_argument("--port", type=int, default=8000)
+    args = parser.parse_args()
+    main(port=args.port)