Forgecad 3d Reconstruction

This skill walks Claude through the full reverse engineering loop: inspect the source file directly, write actual parametric code (never just wrap it in an import), then iteratively compare with `forgecad compare 3d` to measure RMS error, coverage, and volume delta. The workflow is structured around a blockout-first approach and numeric scoring at increasing fidelity. Scores above 95 mean you nailed a simple part, 90+ is solid for typical mechanical geometry, 80+ is acceptable for organic shapes. The source is evidence, the deliverable is readable `.forge.js` that reconstructs intent, not vertices.