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- Delete scripts/download_gisco_nuts.py (superseded)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>

scripts/download_gisco_nuts.py

@@ -1,81 +0,0 @@
-"""Download NUTS-2 boundary GeoJSON from Eurostat GISCO.
-
-One-time (or on NUTS revision) download of NUTS-2 boundary polygons used for
-spatial income resolution in dim_locations. Stored uncompressed because DuckDB's
-ST_Read function cannot read gzipped files.
-
-NUTS classification changes approximately every 7 years. Current revision: 2021.
-
-Output: {LANDING_DIR}/gisco/2024/01/nuts2_boundaries.geojson  (~5MB, uncompressed)
-
-Usage:
-    uv run python scripts/download_gisco_nuts.py [--landing-dir data/landing]
-
-Idempotent: skips download if the file already exists.
-"""
-
-import argparse
-import sys
-from pathlib import Path
-
-import niquests
-
-# NUTS 2021 revision, 20M scale (1:20,000,000), WGS84 (EPSG:4326), LEVL_2 only.
-# 20M resolution gives simplified polygons that are fast for point-in-polygon
-# matching without sacrificing accuracy at the NUTS-2 boundary level.
-GISCO_URL = (
-    "https://gisco-services.ec.europa.eu/distribution/v2/nuts/geojson/"
-    "NUTS_RG_20M_2021_4326_LEVL_2.geojson"
-)
-
-# Fixed partition: NUTS boundaries are a static reference file, not time-series data.
-# Use the NUTS revision year as the partition to make the source version explicit.
-DEST_REL_PATH = "gisco/2024/01/nuts2_boundaries.geojson"
-
-HTTP_TIMEOUT_SECONDS = 120
-
-
-def download_nuts_boundaries(landing_dir: Path) -> None:
-    dest = landing_dir / DEST_REL_PATH
-    if dest.exists():
-        print(f"Already exists (skipping): {dest}")
-        return
-
-    dest.parent.mkdir(parents=True, exist_ok=True)
-    print(f"Downloading NUTS-2 boundaries from GISCO...")
-    print(f"  URL: {GISCO_URL}")
-
-    with niquests.Session() as session:
-        resp = session.get(GISCO_URL, timeout=HTTP_TIMEOUT_SECONDS)
-        resp.raise_for_status()
-
-    content = resp.content
-    assert len(content) > 100_000, (
-        f"GeoJSON too small ({len(content)} bytes) — download may have failed"
-    )
-    assert b'"FeatureCollection"' in content, "Response does not look like GeoJSON"
-
-    # Write uncompressed — ST_Read requires a plain file
-    tmp = dest.with_suffix(".geojson.tmp")
-    tmp.write_bytes(content)
-    tmp.rename(dest)
-
-    size_mb = len(content) / 1_000_000
-    print(f"  Written: {dest} ({size_mb:.1f} MB)")
-    print("Done. Run SQLMesh plan to rebuild stg_nuts2_boundaries.")
-
-
-def main() -> None:
-    parser = argparse.ArgumentParser(description=__doc__)
-    parser.add_argument("--landing-dir", default="data/landing", type=Path)
-    args = parser.parse_args()
-
-    if not args.landing_dir.is_dir():
-        print(f"Error: landing dir does not exist: {args.landing_dir}", file=sys.stderr)
-        sys.exit(1)
-
-    download_nuts_boundaries(args.landing_dir)
-
-
-if __name__ == "__main__":
-    main()