Publish party-position estimates and validation materials

data/README.md

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+# Data directory
+
+This directory contains only the processed, model-ready inputs used by the Julia/Stan estimation pipeline:
+
+- `text_data.csv`
+- `expert.csv`
+- `lr_data.csv`
+- `union_mapping.csv`
+- `party_families.csv`
+
+Original raw source files and intermediate build products are not stored here. To regenerate the processed inputs, place raw files in a local directory and set `PARTY2D_RAW_DATA_DIR`; see `../data-setup/README.md`.
+
+Generated outputs and temporary staging files are ignored by git.