Add quality standards and team command design patterns documentation

- Introduced a new quality standards document outlining assessment criteria for team command .md files, including completeness, pattern compliance, integration, and consistency dimensions.
- Established quality gates and issue classification for errors, warnings, and informational notes.
- Created a comprehensive team command design patterns document detailing infrastructure and collaboration patterns, including message bus integration, YAML front matter requirements, task lifecycle, five-phase execution structure, and error handling.
- Included a pattern selection guide for collaboration scenarios to enhance team interaction models.

ccw/frontend/src/hooks/useMcpServers.ts

@@ -473,6 +473,8 @@ export interface UseProjectOperationsReturn {
   isFetchingServers: boolean;
 }
 
+const EMPTY_PROJECTS: string[] = [];
+
 /**
  * Combined hook for project operations (all projects, cross-CLI copy, other projects' servers)
  */
@@ -519,7 +521,7 @@ export function useProjectOperations(): UseProjectOperationsReturn {
   };
 
   return {
-    projects: projectsQuery.data?.projects ?? [],
+    projects: projectsQuery.data?.projects ?? EMPTY_PROJECTS,
     currentProject: projectsQuery.data?.currentProject ?? projectPath ?? undefined,
     isLoading: projectsQuery.isLoading,
     error: projectsQuery.error,