Add Phase 1A-C + ICE warehouse stocks: prices, methodology, pipeline automation

Phase 1A — KC=F Coffee Futures Prices:
- New extract/coffee_prices/ package (yfinance): downloads KC=F daily OHLCV,
  stores as gzip CSV with SHA256-based idempotency
- SQLMesh models: raw/coffee_prices → foundation/fct_coffee_prices →
  serving/coffee_prices (with 20d/50d SMA, 52-week high/low, daily return %)
- Dashboard: 4 metric cards + dual-line chart (close, 20d MA, 50d MA)
- API: GET /commodities/<ticker>/prices

Phase 1B — Data Methodology Page:
- New /methodology route with full-page template (base.html)
- 6 anchored sections: USDA PSD, CFTC COT, KC=F price, ICE warehouse stocks,
  data quality model, update schedule table
- "Methodology" link added to marketing footer

Phase 1C — Automated Pipeline:
- supervisor.sh updated: runs extract_cot, extract_prices, extract_ice in
  sequence before transform
- Webhook failure alerting via ALERT_WEBHOOK_URL env var (ntfy/Slack/Telegram)

ICE Warehouse Stocks:
- New extract/ice_stocks/ package (niquests): normalizes ICE Report Center CSV
  to canonical schema, hash-based idempotency, soft-fail on 404 with guidance
- SQLMesh models: raw/ice_warehouse_stocks → foundation/fct_ice_warehouse_stocks
  → serving/ice_warehouse_stocks (30d avg, WoW change, 52w drawdown)
- Dashboard: 4 metric cards + line chart (certified bags + 30d avg)
- API: GET /commodities/<code>/stocks

Foundation:
- dim_commodity: added ticker (KC=F) and ice_stock_report_code (COFFEE-C) columns
- macros/__init__.py: added prices_glob() and ice_stocks_glob()
- pipelines.py: added extract_prices and extract_ice entries

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

infra/supervisor/supervisor.sh

@@ -2,6 +2,11 @@
 # Materia Supervisor - Continuous pipeline orchestration
 # Inspired by TigerBeetle's CFO supervisor: simple, resilient, easy to understand
 # https://github.com/tigerbeetle/tigerbeetle/blob/main/src/scripts/cfo_supervisor.sh
+#
+# Environment variables (set in systemd EnvironmentFile):
+#   LANDING_DIR        — local path for extracted landing data
+#   DUCKDB_PATH        — path to DuckDB lakehouse file
+#   ALERT_WEBHOOK_URL  — optional ntfy.sh / Slack / Telegram webhook for failure alerts
 
 set -eu
 
@@ -24,14 +29,33 @@ do
         git switch --discard-changes --detach origin/master
         uv sync
 
-        # Run pipelines
+        # Extract all data sources
         LANDING_DIR="${LANDING_DIR:-/data/materia/landing}" \
         DUCKDB_PATH="${DUCKDB_PATH:-/data/materia/lakehouse.duckdb}" \
             uv run materia pipeline run extract
 
+        LANDING_DIR="${LANDING_DIR:-/data/materia/landing}" \
+        DUCKDB_PATH="${DUCKDB_PATH:-/data/materia/lakehouse.duckdb}" \
+            uv run materia pipeline run extract_cot
+
+        LANDING_DIR="${LANDING_DIR:-/data/materia/landing}" \
+        DUCKDB_PATH="${DUCKDB_PATH:-/data/materia/lakehouse.duckdb}" \
+            uv run materia pipeline run extract_prices
+
+        LANDING_DIR="${LANDING_DIR:-/data/materia/landing}" \
+        DUCKDB_PATH="${DUCKDB_PATH:-/data/materia/lakehouse.duckdb}" \
+            uv run materia pipeline run extract_ice
+
+        # Transform all data sources
         LANDING_DIR="${LANDING_DIR:-/data/materia/landing}" \
         DUCKDB_PATH="${DUCKDB_PATH:-/data/materia/lakehouse.duckdb}" \
             uv run materia pipeline run transform
 
-    ) || sleep 600  # Sleep 10 min on failure to avoid busy-loop retries
+    ) || {
+        # Notify on failure if webhook is configured, then sleep to avoid busy-loop
+        if [ -n "${ALERT_WEBHOOK_URL:-}" ]; then
+            curl -s -d "Materia pipeline failed at $(date)" "$ALERT_WEBHOOK_URL" 2>/dev/null || true
+        fi
+        sleep 600  # Sleep 10 min on failure
+    }
 done