How Codex Can Drive Verifiable SketchUp Modeling

This is not a step-by-step tutorial. Until the demo path is fully verified, I do not want to package it as something readers can simply follow and reproduce. A more accurate label is architecture walkthrough: this piece explains why Codex or another agent CLI should not "magically control SketchUp" directly, and why it should instead use verifiable intermediate layers to turn natural-language intent into checkable, executable, repairable project state. Using SketchUp Agent Harness as the example