fix: Resolve ShellCheck warnings in test script

Separate variable declaration from assignment in validate_mcp_metadata
to avoid masking return values and resolve ShellCheck warnings.

Author: JakeSCahill

modules/ai-agents/examples/test-mcp-examples.sh

@@ -63,8 +63,10 @@ validate_mcp_metadata() {
     fi
 
     # Check for required MCP fields
-    local has_enabled=$(grep -c "enabled: true" "$file" || echo 0)
-    local has_description=$(grep -c "description:" "$file" || echo 0)
+    local has_enabled
+    local has_description
+    has_enabled=$(grep -c "enabled: true" "$file" || echo 0)
+    has_description=$(grep -c "description:" "$file" || echo 0)
 
     if [[ $has_enabled -eq 0 ]]; then
         echo -e "${YELLOW}WARNING${NC} (mcp.enabled not set to true)"