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/foundation/dim_commodity.sql

@@ -0,0 +1,15 @@
+/* Commodity dimension: conforms identifiers across source systems. */ /* This is the ontology. Each row is a commodity tracked by BeanFlows. */ /* As new sources are added (ICO, futures prices, satellite), their */ /* commodity identifiers are added as columns here — not as separate tables. */ /* As new commodities are added (cocoa, sugar), rows are added here. */ /* References: */ /*   usda_commodity_code → staging.psdalldata__commodity.commodity_code (numeric string, e.g. '0711100') */ /*   cftc_commodity_code → foundation.fct_cot_positioning.cftc_commodity_code (3-char, e.g. '083') */ /* NOTE: Defined as FULL model (not SEED) to guarantee leading-zero preservation. */ /*   Pandas CSV loading converts '083' → 83 even with varchar column declarations. */
+MODEL (
+  name foundation.dim_commodity,
+  kind FULL
+);
+
+SELECT
+  usda_commodity_code,
+  cftc_commodity_code,
+  ticker,
+  ice_stock_report_code,
+  commodity_name,
+  commodity_group
+FROM (VALUES
+  ('0711100', '083', 'KC=F', 'COFFEE-C', 'Coffee, Green', 'Softs')) AS t(usda_commodity_code, cftc_commodity_code, ticker, ice_stock_report_code, commodity_name, commodity_group)