fix(ontology): complete PR 18 research graph

Add source: sejm_api_2011_2022 - remaining attributed Sejm speeches

Add UZP public-procurement rulings (KIO/SO/SA/SN) (#39)

Add eight CC BY-SA 4.0 Polish academic books from ROCK (#33)

Contributor guidance: source findings log + PR/normalization requirements (#17)

Add source: sejm_api — contemporary parliamentary speeches (2023 onward) (#16)

feat(data): add samorzad.gov.pl institutional corpus (#13)

Complete v0.2.3 phrase-frequency report + register drifted sources + AGENTS.md (#10)

Add dataset growth plot by version

Release v0.2.3 with community HPLT contribution

Add source: govpl (gov.pl government press releases) (#9)

Credit source expansion contributor

Release v0.2.1 metadata schema update

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