feat(KB-503): add multi-project CLI support

- Add project context utilities for multi-project operations

- Add project subcommands (list, add, remove, set-default, detect)

- Update CLI argument parsing with --project flag support

- Add multi-project documentation and changeset

packages/dashboard/app/components/__tests__/NewTaskModal.test.tsx

@@ -128,7 +128,7 @@ describe("NewTaskModal", () => {
     fireEvent.click(screen.getByRole("button", { name: "Create Task" }));
     
     await waitFor(() => {
-      expect(props.addToast).toHaveBeenCalledWith("Created KB-042", "success");
+      expect(props.addToast).toHaveBeenCalledWith("Created FN-042", "success");
     });
   });