add claude skills

skills/dbt-create-mart/mart_fct_template.sql

@@ -0,0 +1,8 @@
+-- Fact model: thin wrapper exposing all columns from a transform model.
+-- Most common pattern — use dbt_utils.star() to forward all columns.
+
+select {{ dbt_utils.star(ref('<trf_model_name>')) }}
+from {{ ref('<trf_model_name>') }}
+
+-- Optional: add a lightweight filter if needed
+-- where is_active = true