Publish sentence-splitting coverage metrics

README.md

@@ -2182,13 +2182,27 @@ Source code: [GitHub repository](https://github.com/NoeFlandre/osm-polygon-wikid
 | Unique polygon identities (osm_type, osm_id) | 1,188,854 |
 | Polygons with successful non-empty text (unique OSM identities) | 684,411 |
 | Wikipedia + Wikivoyage documents | 2,332,127 |
+| Document words | 833,590,596 |
 | Wikipedia + Wikivoyage sections | 12,666,253 |
+| Sentence rows | 74,791,929 |
 | Wikipedia + Wikivoyage languages | 353 |
 | Geographic regions | 386 |
 | Total Parquet size | 21.2 GB |
 
 Polygon rows preserve regional records; identity and text metrics count each `(osm_type, osm_id)` once. Text requires `fetch_status=ok` and non-empty `full_text`.
 
+Document words count full Wikipedia and Wikivoyage document text; section rows are excluded. Sentence rows include split and explicitly unsplit unsupported-language rows.
+
+## Sentence-splitting coverage
+
+Measured over input text units (sections), not output sentence rows.
+- Eligible text units: 12,666,253
+- Units split because language is supported: 11,197,076
+- Units left unsplit because language is unsupported: 1,469,177
+- Supported-language coverage: 88.4%
+- Unsupported-language share: 11.6%
+- Top unsupported languages by count: `arz` (277,524); `ce` (178,753); `tt` (97,105); `sh` (58,760); `hr` (43,936); `nn` (37,168); `zh-min-nan` (36,499); `ast` (36,246); `azb` (31,494); `simple` (26,509)
+
 ## Coverage maps
 
 ### All polygon identities