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/models/foundation/fct_coffee_prices.sql

@@ -1,69 +1,58 @@
--- Foundation fact: daily KC=F Coffee C futures prices.
---
--- Reads directly from the landing zone, casts varchar columns to proper types,
--- and deduplicates via hash key.
--- Covers all available history from the landing directory.
---
--- Grain: one row per trade_date.
--- Dedup: hash of (trade_date, close) — if Yahoo Finance corrects a price,
---        the new hash triggers a re-ingest on the next incremental run.
-
+/* Foundation fact: daily KC=F Coffee C futures prices. */ /* Reads directly from the landing zone, casts varchar columns to proper types, */ /* and deduplicates via hash key. */ /* Covers all available history from the landing directory. */ /* Grain: one row per trade_date. */ /* Dedup: hash of (trade_date, close) — if Yahoo Finance corrects a price, */ /*        the new hash triggers a re-ingest on the next incremental run. */
 MODEL (
   name foundation.fct_coffee_prices,
   kind INCREMENTAL_BY_TIME_RANGE (
     time_column trade_date
   ),
-  grain (trade_date),
+  grain (
+    trade_date
+  ),
   start '1971-08-16',
   cron '@daily'
 );
 
 WITH src AS (
-  SELECT * FROM read_csv(
+  SELECT
+    *
+  FROM READ_CSV(
     @prices_glob(),
-    compression   = 'gzip',
-    header        = true,
-    union_by_name = true,
-    filename      = true,
-    all_varchar   = true
+    compression = 'gzip',
+    header = TRUE,
+    union_by_name = TRUE,
+    filename = TRUE,
+    all_varchar = TRUE
   )
-),
-
-cast_and_clean AS (
+), cast_and_clean AS (
   SELECT
-    TRY_CAST(Date AS date)        AS trade_date,
-    TRY_CAST(Open AS double)      AS open,
-    TRY_CAST(High AS double)      AS high,
-    TRY_CAST(Low AS double)       AS low,
-    TRY_CAST(Close AS double)     AS close,
-    TRY_CAST(Adj_Close AS double) AS adj_close,
-    TRY_CAST(Volume AS bigint)    AS volume,
-
-    -- Filename encodes the content hash — use as ingest identifier
-    filename                       AS source_file,
-
-    -- Dedup key: trade date + close price
-    hash(Date, Close)              AS hkey
+    TRY_CAST(Date AS DATE) AS trade_date,
+    TRY_CAST(Open AS DOUBLE) AS open,
+    TRY_CAST(High AS DOUBLE) AS high,
+    TRY_CAST(Low AS DOUBLE) AS low,
+    TRY_CAST(Close AS DOUBLE) AS close,
+    TRY_CAST(Adj_Close AS DOUBLE) AS adj_close,
+    TRY_CAST(Volume AS BIGINT) AS volume,
+    filename AS source_file, /* Filename encodes the content hash — use as ingest identifier */
+    HASH(Date, Close) AS hkey /* Dedup key: trade date + close price */
   FROM src
-  WHERE TRY_CAST(Date AS date) IS NOT NULL
-    AND TRY_CAST(Close AS double) IS NOT NULL
-),
-
-deduplicated AS (
+  WHERE
+    NOT TRY_CAST(Date AS DATE) IS NULL AND NOT TRY_CAST(Close AS DOUBLE) IS NULL
+), deduplicated AS (
   SELECT
-    any_value(trade_date)   AS trade_date,
-    any_value(open)         AS open,
-    any_value(high)         AS high,
-    any_value(low)          AS low,
-    any_value(close)        AS close,
-    any_value(adj_close)    AS adj_close,
-    any_value(volume)       AS volume,
-    any_value(source_file)  AS source_file,
+    ANY_VALUE(trade_date) AS trade_date,
+    ANY_VALUE(open) AS open,
+    ANY_VALUE(high) AS high,
+    ANY_VALUE(low) AS low,
+    ANY_VALUE(close) AS close,
+    ANY_VALUE(adj_close) AS adj_close,
+    ANY_VALUE(volume) AS volume,
+    ANY_VALUE(source_file) AS source_file,
     hkey
   FROM cast_and_clean
-  GROUP BY hkey
+  GROUP BY
+    hkey
 )
-
-SELECT *
+SELECT
+  *
 FROM deduplicated
-WHERE trade_date BETWEEN @start_ds AND @end_ds
+WHERE
+  trade_date BETWEEN @start_ds AND @end_ds