Publish curated GeoIntel source snapshot

tests/fixtures/README.md

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+# Test Fixtures
+
+Fixtures should be tiny, deterministic and safe to commit.
+
+Planned fixtures:
+- geospatial/project_area.geojson
+- vectors/reference_buildings.geojson
+- vectors/predicted_buildings.geojson
+- rasters/tiny_raster.tif or generated raster fixture in tests
+
+See `docs/FIXTURE_STRATEGY.md`.