fix(cli): allow --performance free for query run / run-sql

[charisra]

Allow the free performance tier in parsePerformance so community-style API keys can pass validation; update flag help and README. Keeps small/medium/large unchanged.

[cursor]

PR Summary

Low Risk
Small, localized CLI input-validation and documentation change with a simple added test; no auth, data handling, or API behavior changes beyond allowing an additional enum value.

Overview
Updates query run and query run-sql to accept --performance free by extending parsePerformance validation and adjusting help/long descriptions to describe plan-specific tier names.

Refreshes README command documentation to include free in the supported tiers and adds a unit test ensuring run-sql passes through Performance="free" to the API request.

^{Reviewed by Cursor Bugbot for commit a54ab13. Configure here.}

[charisra]

• fix(cli): allow --performance free for query run / run-sql #55 👈 (View in Graphite)
• main

This stack of pull requests is managed by Graphite. Learn more about stacking.