Control Variable Search Skill

This skill generates a parallelised Stata .do file that:

1. Enumerates all subsets of optional control variables via tuples
2. Runs reghdfe (or user-specified command) for each combination across N parallel Stata instances
3. Ranks combinations by |t| of the independent variable
4. Reports Top 10 and runs the best combination regression

Important: This skill only generates the .do file. It does NOT execute it. Tell the user the output path and let them run it in Stata themselves.

What to collect from the user

Ask the user for the following. Items marked (required) must be provided; others have defaults.