fix(macp): use sh instead of bash in gate-runner — Alpine Linux compatibility

packages/macp/src/gate-runner.ts

@@ -43,7 +43,7 @@ export function runShell(
   let timedOut = false;
 
   try {
-    const result = spawnSync('bash', ['-lc', command], {
+    const result = spawnSync('sh', ['-c', command], {
       cwd,
       timeout: Math.max(1, timeoutSec) * 1000,
       encoding: 'utf-8',