chore: scaffold catalog+selection core package

.gitignore

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+__pycache__/
+*.pyc
+.pytest_cache/
+.venv/

hef/catalog.py

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+"""Catalog data model, validation, and JSONL IO."""

hef/selection.py

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+"""Nearest-match selection of a catalog record for a knob coordinate."""

pyproject.toml

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+[project]
+name = "human-experience-filter"
+version = "0.1.0"
+description = "Coordinate-tuned public-domain media installation"
+requires-python = ">=3.11"
+
+[tool.pytest.ini_options]
+testpaths = ["tests"]
+
+[build-system]
+requires = ["setuptools>=68"]
+build-backend = "setuptools.build_meta"
+
+[tool.setuptools]
+packages = ["hef"]

tests/test_smoke.py

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+def test_package_imports():
+    import hef
+    import hef.catalog
+    import hef.selection
+    assert hef is not None