Wire local-only data setup workflow

.gitignore

@@ -1,3 +1,4 @@
+# Local-only raw downloads, build intermediates, regenerated inputs, and reports.
 _local/
 tmp/
 outputs/
@@ -5,6 +6,17 @@ outputs/
 data/raw/
 data/staging/
 data/releases/
+data/*.csv
+!data/text_data.csv
+!data/expert.csv
+!data/lr_data.csv
+!data/union_mapping.csv
+!data/party_families.csv
+
+data-setup/_local/
+data-setup/build/
+data-setup/generated-inputs/
+data-setup/reports/
 
 metadata/release_manifest_*.csv
 metadata/scientific_data_release_*.txt