feat(extract): add OpenWeatherMap daily weather extractor

Adds extract/openweathermap package with daily weather extraction for 8
coffee-growing regions (Brazil, Vietnam, Colombia, Ethiopia, Honduras,
Guatemala, Indonesia). Feeds crop stress signal for commodity sentiment score.

Extractor:
- OWM One Call API 3.0 / Day Summary — one JSON.gz per (location, date)
- extract_weather: daily, fetches yesterday + today (16 calls max)
- extract_weather_backfill: fills 2020-01-01 to yesterday, capped at 500
  calls/run with resume cursor '{location_id}:{date}' for crash safety
- Full idempotency via file existence check; state tracking via extract_core

SQLMesh:
- seeds.weather_locations (8 regions with lat/lon/variety)
- foundation.fct_weather_daily: INCREMENTAL_BY_TIME_RANGE, grain
  (location_id, observation_date), dedup via hash key, crop stress flags:
  is_frost (<2°C), is_heat_stress (>35°C), is_drought (<1mm), in_growing_season

Landing path: LANDING_DIR/weather/{location_id}/{year}/{date}.json.gz

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

transform/sqlmesh_materia/macros/__init__.py

@@ -43,3 +43,14 @@ def ice_stocks_by_port_glob(evaluator) -> str:
     """Return a quoted glob path for all ICE historical by-port CSV gzip files under LANDING_DIR."""
     landing_dir = evaluator.var("LANDING_DIR") or os.environ.get("LANDING_DIR", "data/landing")
     return f"'{landing_dir}/ice_stocks_by_port/**/*.csv.gzip'"
+
+
+@macro()
+def weather_glob(evaluator) -> str:
+    """Return a quoted glob path for all OWM weather JSON gzip files under LANDING_DIR.
+
+    Pattern: weather/{location_id}/{year}/{date}.json.gz
+    The double-star catches all location_id subdirectories.
+    """
+    landing_dir = evaluator.var("LANDING_DIR") or os.environ.get("LANDING_DIR", "data/landing")
+    return f"'{landing_dir}/weather/**/*.json.gz'"