Lead with Jerusalem amplification factor (4x NO2 vs Western weekends)

Add meteorological deweathering layer + Canadian AQHI

Promote halachic labels into source parquet + add AQI hourly table

v1.1: add Hebcal-derived columns (shabbat_or_chag_exact, is_yom_tov, holiday)

Initial release: 12 months × 5-min × 12 Jerusalem stations (~7.1M readings)