getCustomTemplates and this.configAggregator    
                                                                                                                       
  What it does                                                                                                               
                
  getCustomTemplates (src/utils/templateCommand.ts:26-33) is a tiny wrapper that reads a single Salesforce config property — 
  customOrgMetadataTemplates — from the supplied ConfigAggregator. It returns either the configured value (a string,         
  typically a path or git URL pointing to a custom templates source) or undefined if the key isn't set or reading throws.    
                                                                                                                             
  export const getCustomTemplates = (configAggregator: ConfigAggregator): string | undefined => {                            
    try {                                                                                                                    
      return configAggregator.getPropertyValue(OrgConfigProperties.ORG_CUSTOM_METADATA_TEMPLATES) as string;                 
    } catch (err) {                                                                                                          
      return undefined;                                     
    }                                                                                                                        
  };                                                        
                                                                                                                             
  The returned string is forwarded into runGenerator as the templates option, which TemplateService.create(templateType,     
  opts, templates) uses to override the bundled templates with the user's custom set.
                                                                                                                             
  Why it's wrapped in try/catch                                                                                              
   
  configAggregator.getPropertyValue can throw if the property metadata isn't registered or the config layer fails to resolve.
   Swallowing the error to undefined lets TemplateService fall back to the default built-in templates instead of failing the
  whole command.                                                                                                             
                                                            
  How this.configAggregator gets there                                                                                       
   
  this.configAggregator is not something this codebase constructs. It's a lazy-loaded property inherited from SfCommand      
  (which extends oclif's Command). When you read it inside a command class, sf-plugins-core resolves it on demand using
  ConfigAggregator.create() from @salesforce/core, which:                                                                    
                                                            
  1. Loads the global sfdx config (~/.sfdx/sfdx-config.json)                                                                 
  2. Loads the local project config (<project>/.sfdx/sfdx-config.json)
  3. Layers env vars on top                                                                                                  
                                                                                                                             
  Each command in this repo follows the same one-liner pattern at the call site — for example in                             
  src/commands/template/generate/ui-bundle/index.ts:123:                                                                     
                                                                                                                             
  templates: getCustomTemplates(this.configAggregator),     
                                                                                                                             
  So this.configAggregator is the per-command aggregated view of all sf config sources, and getCustomTemplates queries one   
  specific key from it. If the user has set sf config set customOrgMetadataTemplates=<path-or-url>, that value flows through 
  here and overrides the bundled generators; otherwise the call returns undefined and the default templates are used.