test(f6): assert toggleDiffView + pinDiffBaseline are no-folder stubs (#8, SLICE-4)

Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>

test/e2e/suite-no-workspace/noWorkspace.test.ts

@@ -28,6 +28,8 @@ suite("no-workspace activation (#8)", () => {
       "cowriting.acceptProposal",
       "cowriting.rejectProposal",
       "cowriting.proposeAgentEdit",
+      "cowriting.toggleDiffView",
+      "cowriting.pinDiffBaseline",
     ]) {
       assert.ok(all.includes(command), `${command} is registered`);
     }