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/fct_coffee_prices.sql

@@ -0,0 +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. */
+MODEL (
+  name foundation.fct_coffee_prices,
+  kind INCREMENTAL_BY_TIME_RANGE (
+    time_column trade_date
+  ),
+  grain (
+    trade_date
+  ),
+  start '1971-08-16',
+  cron '@daily'
+);
+
+WITH src AS (
+  SELECT
+    *
+  FROM READ_CSV(
+    @prices_glob(),
+    compression = 'gzip',
+    header = TRUE,
+    union_by_name = TRUE,
+    filename = TRUE,
+    all_varchar = TRUE
+  )
+), 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 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
+    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,
+    hkey
+  FROM cast_and_clean
+  GROUP BY
+    hkey
+)
+SELECT
+  *
+FROM deduplicated
+WHERE
+  trade_date BETWEEN @start_ds AND @end_ds