Add progress logging to HPLT filtering

Add European HPLT Polish web filtering workflow

Add v0.3 source license review and quality mix workflow

Add phrase frequency stats and HF card snippet for Polish DynaWord

v0.2.0 data: +wikinews/wikivoyage/wikibooks/wikiquote/eltec_pol parquet

Squash: collapse LFS history to reclaim private storage