Refactor README: bilingual VI/EN throughout, pedagogical framing, no third-party brand references

Add dual citation: HF redistribution + original source

Drop WKT column from row parquets (HF viewer 100 KB row cap; geometry stays in geo/*.geojson)

Rename BibTeX key nso_2026 -> merge_2026

Add representative figures + Sáp Nhập BibTeX

Refresh raw listings

Refresh cartographic figure pack (NVIDIA + dual archipelagos)

Refresh analytical figure pack

Refresh narrative docs

Refresh DATAANALYSIS notebook

Refresh UMAP-reduced parquet

Refresh GeoJSON FeatureCollections

Refresh per-kind parquet bundle

Refresh stats snapshot

Refresh dataset card

initial commit