feat(extract): GISCO extractor + wire all unscheduled extractors
- New gisco.py: proper extractor module replacing scripts/download_gisco_nuts.py.
Writes uncompressed .geojson (ST_Read can't handle .gz). Fixed partition path
gisco/2024/01/nuts2_boundaries.geojson; cursor tracking skips re-download monthly.
- all.py: import + register gisco in EXTRACTORS (9 independent, 1 dep)
- pyproject.toml: add extract-gisco entry point
- workflows.toml: add census_usa, census_usa_income, eurostat_city_labels,
ons_uk, gisco — all monthly, no dependencies
- Delete scripts/download_gisco_nuts.py (superseded)
Unblocks: stg_nuts2_boundaries, stg_regional_income, stg_income_usa,
and 4 downstream models (dim_locations, pseo_city_costs_de,
location_opportunity_profile, pseo_country_overview).
Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>
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