UK reshard1: split laws.parquet (390 MB) and articles.parquet (277 MB) into ≤300 MB shards; delete originals; README globs; scrapers/reshard1

UK delta 1: 130 instruments / 1,523 articles (legislation.gov.uk feed 2026-09-03..10-08 + 20 local text rows) + code bundle; README globs

Refresh UK legislation.gov.uk pack (156830 laws / 1669352 articles; SI born-digital complete; OCR backlog documented)

UK interim: 6158 Public General Acts (was 4512); still incomplete vs 17560 ukpga; no SIs yet

UK primary Acts snapshot: 4512 laws, 330370 articles (OGL v3.0; incomplete vs ukpga catalog)