M3 Integration fixes pass 20

scripts/build-modules.mjs

@@ -1,8 +1,13 @@
 import fs from 'node:fs';
 import path from 'node:path';
-import { execSync } from 'node:child_process';
+import { execFileSync } from 'node:child_process';
 
 const modulesDir = path.resolve('Modules');
+const npmCli = process.env.npm_execpath;
+
+if (!npmCli || !path.isAbsolute(npmCli) || !fs.existsSync(npmCli)) {
+    throw new Error('npm_execpath must reference an existing absolute npm CLI path.');
+}
 
 for (const moduleName of fs.readdirSync(modulesDir)) {
 
@@ -23,11 +28,13 @@ for (const moduleName of fs.readdirSync(modulesDir)) {
     console.log(`Building ${moduleName}`);
 
     try {
-        execSync(
-            'npm run build',
+        execFileSync(
+            process.execPath,
+            [npmCli, 'run', 'build'],
             {
                 cwd: modulePath,
                 stdio: 'inherit',
+                env: { ...process.env, PATH: '/usr/bin:/bin' },
             }
         );
     } catch (error) {