fix(pi): verify Linux compatibility executable

scripts/lib/pi-product-artifact.mjs

@@ -23,6 +23,7 @@ import {
 } from '../probe-pi-packaged-runtime.mjs';
 
 const PRODUCT_NAME = 'Makelore';
+const LINUX_EXECUTABLE_NAME = 'niancode';
 const EXTENSION_CONTRACT_MARKERS = Object.freeze([
   'Makelore runtime bridge rejected the request',
   'subagent.dispatch',
@@ -79,7 +80,7 @@ export function defaultProductExecutable(projectRoot, currentPlatform = hostPlat
     return join(root, 'release', 'mac', `${PRODUCT_NAME}.app`, 'Contents', 'MacOS', PRODUCT_NAME);
   }
   if (currentPlatform === 'linux') {
-    return join(root, 'release', 'linux-unpacked', PRODUCT_NAME.toLowerCase());
+    return join(root, 'release', 'linux-unpacked', LINUX_EXECUTABLE_NAME);
   }
   throw new Error(`Unsupported product artifact platform: ${currentPlatform}`);
 }