Remove the omarchy-update-perform compatibility wrapper

Nothing calls it anymore; new code calls omarchy-update directly.

Co-Authored-By: Claude Opus 5 (1M context) <noreply@anthropic.com>

bin/omarchy-update-perform

@@ -1,7 +0,0 @@
-#!/bin/bash
-
-# omarchy:summary=Compatibility wrapper for omarchy-update -y.
-# omarchy:hidden=true
-# omarchy:requires-sudo=true
-
-exec omarchy-update -y