Add requirements.txt

requirements.txt

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+# Dependencies for the OpenH-RF eSAF sub-dataset package.
+# Install with:  python -m pip install -r requirements.txt
+#
+# reconstruct.py follows the OpenH-RF example templates and runs the processing
+# chain defined in pipeline.yaml through the zea.Pipeline — zea (>= 0.1.0, the
+# version the files were written with via zea.File.create) and one Keras backend
+# (jax below; tensorflow/torch also work, set KERAS_BACKEND accordingly) are
+# required. Run with:  KERAS_BACKEND=jax python reconstruct.py
+numpy>=1.24
+scipy>=1.10
+matplotlib>=3.6
+h5py>=3.8
+pyyaml>=6.0
+zea>=0.1.0
+jax
+
+# Notes:
+# - verify_submission.py's structural checks (deliverables, HDF5 schema, manifest,
+#   pipeline.yaml) need only numpy/h5py/pyyaml; its reconstruction smoke test runs
+#   reconstruct.py and therefore needs zea + a backend like everything else.
+# - extras/esaf_demo.py (optional eSAF demonstration) needs only numpy/scipy/
+#   matplotlib/h5py.