fix(supervisor): add extract_cot_combined to workflows.toml

fct_cot_positioning UNIONs both cot/ and cot_combined/ landing dirs,
but only extract_cot_dataset was scheduled. Without cot_combined/ present,
SQLMesh would fail with "No files found" on every tick.

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

infra/supervisor/workflows.toml

@@ -18,6 +18,11 @@ module = "cftc_cot.execute"
 entry = "extract_cot_dataset"
 schedule = "weekly"
 
+[extract_cot_combined]
+module = "cftc_cot.execute"
+entry = "extract_cot_combined"
+schedule = "weekly"
+
 [extract_prices]
 module = "coffee_prices.execute"
 entry = "extract_coffee_prices"