fix: fail fast on malformed custom module YAML

User customizations must be valid - silent skip hides broken configs.

tools/cli/installers/lib/modules/manager.js

@@ -391,8 +391,8 @@ class ModuleManager {
           if (config.code === moduleName) {
             return modulePath;
           }
-        } catch {
+        } catch (error) {
-          // Skip if can't read config
+          throw new Error(`Failed to parse module.yaml at ${configPath}: ${error.message}`);
         }
       }
     }

tools/cli/lib/ui.js

@@ -636,8 +636,8 @@ class UI {
                 moduleData = yaml.load(yamlContent);
                 foundPath = configPath;
                 break;
-              } catch {
+              } catch (error) {
-                // Continue to next path
+                throw new Error(`Failed to parse config at ${configPath}: ${error.message}`);
               }
             }
           }