refactor: rename materia → beanflows throughout codebase

- Rename src/materia/ → src/beanflows/ (Python package)
- Rename transform/sqlmesh_materia/ → transform/sqlmesh_beanflows/
- Rename infra/supervisor/materia-supervisor.service → beanflows-supervisor.service
- Rename infra/backup/materia-backup.{service,timer} → beanflows-backup.{service,timer}
- Update all path strings: /opt/materia → /opt/beanflows, /data/materia → /data/beanflows
- Update pyproject.toml: project name, CLI entrypoint, workspace source key
- Update all internal imports from materia.* → beanflows.*
- Update infra scripts: REPO_DIR, service names, systemctl references
- Fix docker-compose.prod.yml: /data/materia → /data/beanflows (bind mount path)

Intentionally left unchanged: Pulumi stack name (materia-infrastructure) and
Hetzner resource names ("materia-key", "managed_by: materia") — these reference
live cloud infrastructure and require separate cloud-side renames.

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

transform/sqlmesh_beanflows/models/serving/coffee_prices.sql

@@ -0,0 +1,63 @@
+/* Serving mart: KC=F Coffee C futures prices, analytics-ready. */ /* Adds moving averages (20-day, 50-day SMA) and 52-week high/low range. */ /* Filtered to trading days only (NULL close rows excluded upstream). */ /* Grain: one row per trade_date. */
+MODEL (
+  name serving.coffee_prices,
+  kind INCREMENTAL_BY_TIME_RANGE (
+    time_column trade_date
+  ),
+  grain (
+    trade_date
+  ),
+  start '1971-08-16',
+  cron '@daily'
+);
+
+WITH base AS (
+  SELECT
+    f.trade_date,
+    f.open,
+    f.high,
+    f.low,
+    f.close,
+    f.adj_close,
+    f.volume,
+    ROUND(
+      (
+        f.close - LAG(f.close, 1) OVER (ORDER BY f.trade_date)
+      ) / NULLIF(LAG(f.close, 1) OVER (ORDER BY f.trade_date), 0) * 100,
+      4
+    ) AS daily_return_pct, /* Daily return: (close - prev_close) / prev_close * 100 */
+    ROUND(
+      AVG(f.close) OVER (ORDER BY f.trade_date ROWS BETWEEN 19 PRECEDING AND CURRENT ROW),
+      4
+    ) AS sma_20d, /* 20-day simple moving average (1 trading month) */
+    ROUND(
+      AVG(f.close) OVER (ORDER BY f.trade_date ROWS BETWEEN 49 PRECEDING AND CURRENT ROW),
+      4
+    ) AS sma_50d, /* 50-day simple moving average (2.5 trading months) */
+    MAX(f.high) OVER (ORDER BY f.trade_date ROWS BETWEEN 251 PRECEDING AND CURRENT ROW) AS high_52w, /* 52-week high (approximately 252 trading days) */
+    MIN(f.low) OVER (ORDER BY f.trade_date ROWS BETWEEN 251 PRECEDING AND CURRENT ROW) AS low_52w /* 52-week low */
+  FROM foundation.fct_coffee_prices AS f
+  WHERE
+    f.trade_date BETWEEN @start_ds AND @end_ds
+)
+SELECT
+  b.trade_date,
+  d.commodity_name,
+  d.ticker,
+  b.open,
+  b.high,
+  b.low,
+  b.close,
+  b.adj_close,
+  b.volume,
+  b.daily_return_pct,
+  b.sma_20d,
+  b.sma_50d,
+  b.high_52w,
+  b.low_52w
+FROM base AS b
+CROSS JOIN foundation.dim_commodity AS d
+WHERE
+  d.ticker = 'KC=F'
+ORDER BY
+  b.trade_date