first commit

src/gpu_rent/errors.py

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+"""User-facing errors without tracebacks."""
+
+from __future__ import annotations
+
+
+class GpuRentError(Exception):
+    """Printed as a short message; process exits 1."""
+
+
+class ConfigError(GpuRentError):
+    pass
+
+
+class CloudError(GpuRentError):
+    pass
+
+
+class NotReadyError(GpuRentError):
+    """Command exists in the spec but is not implemented yet."""