Handle Coana npm fallback spawn errors

Author: cursoragent

src/utils/dlx.mts

@@ -316,13 +316,17 @@ async function spawnCoanaViaNpmInstall(
       message: `npm install fallback failed: ${stderr || cause}`,
     }
   }
-  return await spawnCoanaScriptViaNode(
-    scriptPath,
-    args,
-    finalEnv,
-    options,
-    spawnExtra,
-  )
+  try {
+    return await spawnCoanaScriptViaNode(
+      scriptPath,
+      args,
+      finalEnv,
+      options,
+      spawnExtra,
+    )
+  } catch (e) {
+    return buildDlxErrorResult(e)
+  }
 }
 
 /**

src/utils/dlx.test.mts

@@ -388,5 +388,40 @@ describe('utils/dlx', () => {
       expect(result.message).toContain('npm-install fallback also failed')
       expect(result.message).toContain('registry unreachable')
     })
+
+    it('surfaces both dlx and node errors when fallback node spawn fails', async () => {
+      mockSpawn.mockImplementation(async (cmd: string, args: string[]) => {
+        if (cmd === 'npm' && args[0] === 'install') {
+          const prefixIdx = args.indexOf('--prefix')
+          const installDir = args[prefixIdx + 1]
+          const pkgDir = path.join(
+            installDir,
+            'node_modules',
+            '@coana-tech',
+            'cli',
+          )
+          await fs.mkdir(pkgDir, { recursive: true })
+          await fs.writeFile(
+            path.join(pkgDir, 'package.json'),
+            JSON.stringify({ bin: { coana: 'dist/cli.js' } }),
+          )
+          return { stdout: '', stderr: '' }
+        }
+        throw Object.assign(new Error('node boom'), {
+          code: 127,
+          stderr: 'node failed',
+        })
+      })
+
+      const result = await spawnCoanaDlx(['run', '.'], 'acme', {
+        coanaVersion: nextVersion(),
+      })
+
+      expect(result.ok).toBe(false)
+      expect(result.message).toContain('Coana command failed')
+      expect(result.message).toContain('npx aborted')
+      expect(result.message).toContain('npm-install fallback also failed')
+      expect(result.message).toContain('node failed')
+    })
   })
 })