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/ice_aging_stocks.sql

@@ -0,0 +1,51 @@
+/* Serving mart: ICE certified Coffee C stock aging report, analytics-ready. */ /* Shows the age distribution of certified stocks across delivery ports. */ /* Age buckets represent how long coffee has been in certified storage. */ /* Older stock approaching certificate limits is a supply quality signal. */ /* Source: ICE Certified Stock Aging Report (monthly) */ /* Grain: one row per (report_date, age_bucket). */
+MODEL (
+  name serving.ice_aging_stocks,
+  kind INCREMENTAL_BY_TIME_RANGE (
+    time_column report_date
+  ),
+  grain (report_date, age_bucket),
+  start '2020-01-01',
+  cron '@daily'
+);
+
+WITH base AS (
+  SELECT
+    f.report_date,
+    f.age_bucket,
+    TRY_CAST(SPLIT_PART(f.age_bucket, ' to ', 1) AS INT) AS age_bucket_start_days, /* Parse age range from "0000 to 0120" format for correct sort order */
+    TRY_CAST(SPLIT_PART(f.age_bucket, ' to ', 2) AS INT) AS age_bucket_end_days,
+    f.antwerp_bags,
+    f.hamburg_bremen_bags,
+    f.houston_bags,
+    f.miami_bags,
+    f.new_orleans_bags,
+    f.new_york_bags,
+    f.total_bags,
+    f.source_file
+  FROM foundation.fct_ice_aging_stocks AS f
+  WHERE
+    f.report_date BETWEEN @start_ds AND @end_ds
+)
+SELECT
+  b.report_date,
+  d.commodity_name,
+  d.ice_stock_report_code,
+  b.age_bucket,
+  b.age_bucket_start_days,
+  b.age_bucket_end_days,
+  b.antwerp_bags,
+  b.hamburg_bremen_bags,
+  b.houston_bags,
+  b.miami_bags,
+  b.new_orleans_bags,
+  b.new_york_bags,
+  b.total_bags,
+  b.source_file
+FROM base AS b
+CROSS JOIN foundation.dim_commodity AS d
+WHERE
+  d.ice_stock_report_code = 'COFFEE-C'
+ORDER BY
+  b.report_date,
+  b.age_bucket_start_days