Add Cortex Portal — web visualization for knowledge graph

Express API server wrapping existing store/graph core with REST endpoints
for nodes, edges, graph, and search. React + Vite portal with React Flow
for interactive graph visualization, Tailwind CSS styling, and full CRUD UI
(sidebar, node panel, add/link modals, search bar, toast notifications).

src/cli/index.ts

@@ -8,6 +8,7 @@ import { listCommand } from './commands/list';
 import { updateCommand } from './commands/update';
 import { removeCommand } from './commands/remove';
 import { graphCommand } from './commands/graph';
+import { serveCommand } from './commands/serve';
 import { closeDb } from '../core/db';
 
 const program = new Command();
@@ -25,6 +26,7 @@ program.addCommand(listCommand);
 program.addCommand(updateCommand);
 program.addCommand(removeCommand);
 program.addCommand(graphCommand);
+program.addCommand(serveCommand);
 
 program.hook('postAction', () => {
   closeDb();