Fix COT pipeline: TRY_CAST nulls, dim_commodity leading zeros, correct CFTC codes

- config.yaml: remove ambiguousorinvalidcolumn linter rule (false positives on read_csv TVFs)
- fct_cot_positioning: use TRY_CAST throughout — CFTC uses '.' as null in many columns
- raw/cot_disaggregated: add columns() declaration for 33 varchar cols
- dim_commodity: switch from SEED to FULL model with SQL VALUES to preserve leading zeros
  Pandas auto-converts '083' → 83 even with varchar column declarations in SEED models
- seeds/dim_commodity.csv: correct cftc_commodity_code from '083731' (contract market code)
  to '083' (3-digit CFTC commodity code); add CSV quoting
- test_cot_foundation.yaml: fix output key name, vars for time range, partial: true,
  and correct cftc_commodity_code to '083'
- analytics.py: COFFEE_CFTC_CODE '083731' → '083' to match actual data

Result: serving.cot_positioning has 685 rows (2013-01-08 to 2026-02-17), 23/23 tests pass.

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

transform/sqlmesh_materia/tests/test_cot_foundation.yaml

@@ -1,11 +1,14 @@
 test_fct_cot_positioning_types_and_net_positions:
   model: foundation.fct_cot_positioning
+  vars:
+    start: "2024-01-01"
+    end: "2024-01-31"
   inputs:
     raw.cot_disaggregated:
       rows:
         - market_and_exchange_names: "COFFEE C - ICE FUTURES U.S."
           report_date_as_yyyy_mm_dd: "2024-01-02"
-          cftc_commodity_code: "083731"
+          cftc_commodity_code: "083"
           cftc_contract_market_code: "083731"
           contract_units: "37,500 POUNDS"
           open_interest_all: "250000"
@@ -36,29 +39,34 @@ test_fct_cot_positioning_types_and_net_positions:
           traders_m_money_short_all: "62"
           traders_m_money_spread_all: "20"
           filename: "data/landing/cot/2024/abc123.csv.gzip"
-  expected:
-    rows:
-      - report_date: "2024-01-02"
-        cftc_commodity_code: "083731"
-        open_interest: 250000
-        managed_money_long: 60000
-        managed_money_short: 40000
-        managed_money_net: 20000
-        prod_merc_long: 80000
-        prod_merc_short: 90000
-        prod_merc_net: -10000
-        swap_long: 30000
-        swap_short: 35000
-        swap_net: -5000
-        nonreportable_long: 12000
-        nonreportable_short: 14000
-        nonreportable_net: -2000
-        change_managed_money_net: 3000
-        traders_managed_money_long: 85
-        traders_managed_money_short: 62
+  outputs:
+    partial: true
+    query:
+      rows:
+        - report_date: "2024-01-02"
+          cftc_commodity_code: "083"
+          open_interest: 250000
+          managed_money_long: 60000
+          managed_money_short: 40000
+          managed_money_net: 20000
+          prod_merc_long: 80000
+          prod_merc_short: 90000
+          prod_merc_net: -10000
+          swap_long: 30000
+          swap_short: 35000
+          swap_net: -5000
+          nonreportable_long: 12000
+          nonreportable_short: 14000
+          nonreportable_net: -2000
+          change_managed_money_net: 3000
+          traders_managed_money_long: 85
+          traders_managed_money_short: 62
 
 test_fct_cot_positioning_rejects_null_commodity:
   model: foundation.fct_cot_positioning
+  vars:
+    start: "2024-01-01"
+    end: "2024-01-31"
   inputs:
     raw.cot_disaggregated:
       rows:
@@ -95,5 +103,6 @@ test_fct_cot_positioning_rejects_null_commodity:
           traders_m_money_short_all: "0"
           traders_m_money_spread_all: "0"
           filename: "data/landing/cot/2024/abc123.csv.gzip"
-  expected:
-    rows: []
+  outputs:
+    query:
+      rows: []