Fix default agent setup edge cases

migrations/1785617047.sh

@@ -1,3 +1,5 @@
 echo "Install oh-my-pi (omp) via mise wrapper"
 
-omarchy-mise-install oh-my-pi omp
+if [[ ! -f $HOME/.local/state/omarchy/preinstalls-removed ]]; then
+  omarchy-mise-install github:can1357/oh-my-pi omp
+fi

migrations/1785633225.sh

@@ -1,4 +1,9 @@
-echo "Install Grok and Crush via mise wrappers"
+echo "Install default coding agent mise wrappers"
 
-omarchy-mise-install npm:@xai-official/grok grok
-omarchy-mise-install crush
+if [[ ! -f $HOME/.local/state/omarchy/preinstalls-removed ]]; then
+  omarchy-mise-install github:can1357/oh-my-pi omp
+  omarchy-mise-install npm:@xai-official/grok grok
+  omarchy-mise-install crush
+elif [[ -f $HOME/.local/bin/omp ]] && grep -Fq 'mise use -g "oh-my-pi"' "$HOME/.local/bin/omp"; then
+  rm -f "$HOME/.local/bin/omp"
+fi