Merge origin/main (1000_novels rescreen, PR 65) into v026-wolne_lektury-dedup

1000_novels: rescreen with cited translator death years, pin the screen (837 -> 887 texts) (#65)

Merge origin/main (global_voices #66) into v026-wolne_lektury-dedup

wolne_lektury: drop 63 docs that duplicate eltec_pol novels (v2#72)

global_voices: drop 114 partner republications (2,040 -> 1,926 docs) (#66)

samorzad_gov_pl: drop 144 third-party rows, relabel licence basis (v0.2.6, v2#49) (#64)

govpl: drop 188 PAP reprints (gov.pl third-party carve-out), add URL sidecar (#63)

biblioteka_nauki: drop the 3 Public Domain Mark records (#62)

Withdraw wikisource: one CC BY-SA label over mixed per-page licences (#60)

Withdraw wikiquote: most quotations are in copyright (#59)

Withdraw common_voice_pl: CC0 not established for its sentences (#58)

Withdraw fandom_pl: Fandom ToU bars scraping and AI training (#57)

Withdraw openstax_pl: OpenStax Poland states NC and an LLM-training ban (#56)

Remove parlamint_pl from the source registry (#54)

nkjp1m: relabel CC BY 4.0 per the NKJP Consortium, add agreed attribution file (#51)

wiktionary_examples: drop quoted third-party lines, relabel CC BY-SA 4.0 (#50)

1000_novels: keep only the public-domain texts (#49)

Add permissively licensed OPEN ICM Polish publications pilot (#34)

studia_bas: Studia BAS policy articles (scoped from #19) (#44)

Add source: sejm_committee_transcripts - full Sejm committee zapis coverage (terms 9-10) (#37)

Add CC BY-SA 4.0 Wiadomosci Statystyczne Polish articles (#35)

Add CC BY 4.0 Polish OpenStax academic textbooks (#23)

Add CC BY-SA 4.0 Open AGH Polish chemistry textbooks (#25)

Add plwiki user-talk pages (ns 3) - conversational Polish (#40)

Add plwiki talk pages (ns 1+5) - conversational Polish (#36)

Add CC BY-SA 3.0 Polish cultural-accessibility guides (#27)

Add Polish TED public-procurement notices (#32)

Add CC BY-SA 3.0 Polish media-literacy lessons (#26)

Add source: sejm_interpellations — 10th-term written Q&A (#24)

Add CC0 Polish Common Voice validated text (v26.0) (#22)

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