SKILL.md — Query Builder DAX Generation

Purpose

Document the canonical DAX query structure produced by the Query Builder in the DAX performance test widget (_build_summarize_dax in src/sempy_labs/semantic_model/_test_dax.py).

The pattern follows the well-known "Using DAX as a Query Language" approach (Michael Kovalsky, Elegant BI: https://www.elegantbi.com/post/daxquerylanguage), built on SUMMARIZECOLUMNS.

Use this skill when changing how Query Builder state (columns, measures, filters, sorting) is converted to DAX, so the generated query stays valid and consistent.