refactor(test): remove duplicate vitest-environment directive

The @vitest-environment node directive was declared twice - once in the
docblock (correct location) and once as a standalone comment (redundant).
Removed the duplicate standalone comment to eliminate confusion and follow
standard vitest configuration practices.

Author: jdalton

test/socket-sdk-retry.test.mts

@@ -3,7 +3,6 @@
  * @vitest-environment node
  */
 
-// @vitest-environment node
 // Run these tests in isolated mode to prevent nock state bleeding
 import nock from 'nock'
 import { describe, expect, it } from 'vitest'