Desktop app: prompt suggestions stopped appearing (~12-13 Aug), gated off remotely with no local override

Environment

• Windows 11 Pro (build 26200)
• Claude desktop app 1.28929.0 (MSIX); bundled Claude Code runtime 2.1.227
• Standalone CLI 2.1.173 (native install)

Symptom
Composer ghost-text prompt suggestions no longer appear in desktop-app Claude Code sessions since around 12–13 August 2026 (SGT). They previously appeared regularly. The terminal /config "Prompt suggestions" toggle reads true.

Local state verified

• CLAUDE_CODE_ENABLE_PROMPT_SUGGESTION unset in process, user and machine scope
• promptSuggestionEnabled absent from user, project and local settings (default enabled); no managed-settings.json on the machine
• CLI GrowthBook cache: tengu_chomp_inflection=true, tengu_prompt_suggestion=true
• Desktop GrowthBook refresh healthy: "loaded 254 features (0 changed)" hourly

Analysis
The desktop main process resolves per-session SDK options via resolveGatedSdkSnapshot(), which maps feature gate 162211072 to promptSuggestions and passes it into each session's initConfig. On this SDK path the environment variable acts only as a kill switch, so no local configuration can re-enable the feature. With every local layer enabled and flag fetches succeeding hourly, the remaining explanation is the remote gate resolving false for this account/app. Timing coincides with the 1.28929.0 update (installed 12 Aug 07:30 SGT) and the runtime refresh to 2.1.222/2.1.227 (13 Aug 07:40 SGT).

Question
Was the desktop prompt-suggestions gate disabled in a staged rollout, or is this a regression in 1.28929.0? If intentional, surfacing the state in the app would beat silently dropping the feature.