fix: robust node.js version parsing in installers

Improved Node.js version check logic to handle prefixed version strings and avoid brittle cut commands. Verified with multiple version formats including v24.11.1.

agents/install-claude-customizations.sh

@@ -69,9 +69,11 @@ check_prerequisites() {
     check_command "curl"
 
     # Check Node.js version (need 14+)
-    NODE_VERSION=$(node -v | cut -d'v' -f2 | cut -d'.' -f1)
-    if [ "$NODE_VERSION" -lt 14 ]; then
-        log_error "Node.js version 14 or higher required. Current: $(node -v)"
+    local node_full_version=$(node -v 2>&1)
+    local node_major_version=$(echo "$node_full_version" | grep -oE '[0-9]+' | head -n1)
+    
+    if [ -z "$node_major_version" ] || [ "$node_major_version" -lt 14 ]; then
+        log_error "Node.js version 14 or higher required. Current: $node_full_version"
         exit 1
     fi