test(install-e2e): cut the STT setting's comment to its reason

The commit that added stt.enabled: false carries the mechanism and the
incident. The writer keeps one line saying why the setting exists and
which releases need it; the test assertion needs no comment.

tests-js/scripts/desktop-smoke.test.ts

@@ -96,7 +96,6 @@ test('provider reconfiguration preserves feed, plugins, history and explicit fix
       custom_providers: [{ name: 'Mock', base_url: 'http://127.0.0.1:9001/v1', key_env: 'OPENAI_API_KEY' }],
       auxiliary: { title_generation: { enabled: false } }, approvals: { mode: 'smart' }, display: { interim_assistant_messages: true },
       onboarding: { run: false },
-      // Off so an old release's boot-time STT probe never lazy-installs ahead of the send.
       stt: { provider: 'local', enabled: false },
     })
     expect(fs.readFileSync(path.join(home, '.env'), 'utf8')).toBe('OTHER_TEST_VALUE=kept\nMOCK_API_KEY=e2e-mock-key\n')

tests-js/scripts/mock-provider-config.ts

@@ -77,11 +77,7 @@ export function writeMockProviderConfig(
     // first message the smoke sends; these journeys test install and update, so
     // the root config records onboarding as done.
     onboarding: { ...config.onboarding, run: false },
-    // Releases before v2026.8.13 answer the app's boot-time wake.status inline on
-    // the WebSocket reader, and with STT enabled that probe first lazy-installs
-    // faster-whisper. A slow install holds every later request on the socket, so
-    // session.create outlives the app's 30 s timeout and the send is rolled back.
-    // These journeys test install and update, not voice input.
+    // Pre-v2026.8.13 releases lazy-install faster-whisper on the WS reader when STT is on, stalling the first send.
     stt: { ...config.stt, enabled: false },
     ...extra,
   }