Add engines from the command line through the Typing menu's path

omarchy setup input <engine> had its own restart, append, select and
live-rollback code in configure.py, parallel to the menu's. It now
installs the packages and appends through typing_setup, leaving
configure.py with install-time seeding and update defaults.

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>

bin/omarchy-input-method

@@ -1,7 +1,7 @@
 #!/bin/bash
 
 # omarchy:summary=Configure, inspect, or switch input methods
-# omarchy:args=<status|cycle [back]|configure [--seed|--defaults] [none|mozc|hangul|pinyin|chewing]>
+# omarchy:args=<status|cycle [back]|configure --seed|--defaults>
 # omarchy:hidden=true
 
 set -euo pipefail