test: add reproducible FreeCAD golden oracle

scripts/build-freecad-native.mjs

@@ -0,0 +1,10 @@
+import { execFileSync } from 'node:child_process'
+import { resolve } from 'node:path'
+
+const root = resolve(new URL('..', import.meta.url).pathname)
+const build = resolve(root, '.cache/freecad/build-native')
+const install = resolve(root, '.cache/freecad/install-native')
+const jobs = process.env.FREECAD_BUILD_JOBS || '4'
+execFileSync('cmake', ['--build', build, '--parallel', jobs], { cwd: root, stdio: 'inherit' })
+execFileSync('cmake', ['--install', build], { cwd: root, stdio: 'inherit' })
+console.log(`FreeCAD native oracle installed: ${install}`)