Add TDD Structure Validation and Verification Phases with Comprehensive Reporting

- Introduced Phase 6: TDD Structure Validation to ensure compliance with TDD workflow standards, including task structure validation, dependency checks, and user configuration verification.
- Implemented Phase 7: TDD Verification for full compliance checks, including task chain structure validation, coverage analysis, and TDD cycle verification.
- Generated detailed TDD compliance reports with quality gate recommendations based on objective criteria.
- Added documentation for new commands and workflows in the Claude Commands index.

ccw/frontend/src/components/dashboard/widgets/WorkflowTaskWidget.tsx

@@ -102,7 +102,7 @@ function HomeEmptyState({ className }: HomeEmptyStateProps) {
           </div>
           <div className="flex flex-col gap-2 w-full">
             <code className="px-3 py-2 bg-muted rounded text-xs font-mono text-center">
-              /workflow:plan
+              /workflow-plan
             </code>
             <p className="text-xs text-muted-foreground text-center">
               {formatMessage({ id: 'home.emptyState.noSessions.hint' })}