added: set plwiki_user_talk, nkjp1m, global_voices, 1000_novels to their shard dates (v2#80) (#100)

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

Separate source PRs from releases; add render_sample.py (#42)

feat(data): add reviewed Global Voices Polish corpus (#7)