fix(wrapper): correct disable guidance - #1607

[!NOTE]
Low Risk
User-facing copy and test-only changes; no change to wrapper enable/disable behavior beyond fixing incorrect instructions.

Overview
Corrects the post-enable success message so it tells users to run socket wrapper off instead of the non-existent socket wrapper --disable, aligning guidance with the documented on / off subcommands.

Adds an integration test that enables the wrapper in a temporary home, asserts the printed disable hint and shell aliases, then runs wrapper off and confirms both npm and npx aliases are removed from the profile.

^{Reviewed by Cursor Bugbot for commit 49a9a88. Configure here.}