Agent Skills: power-bi-modeling

Create and manage Power BI semantic model structure using pbi-cli -- tables, columns, measures, relationships, hierarchies, calculation groups, and date/calendar tables. Invoke this skill whenever the user says "create table", "add measure", "add column", "create relationship", "date table", "calendar table", "star schema", "mark as date table", "add hierarchy", "calculation group", or any model-building task. Also invoke when creating multiple measures at once -- the skill contains critical guidance on multi-line DAX expression handling.