Settings → Engines now stacks one pinned Engine Compatibility Matrix per
family (TTS, ASR, LLM) instead of a single TTS-titled table with the other
families tucked behind a low-discoverability tab. The backend select/prefs
path (family="asr" → prefs.asr_backend, env > prefs > auto-detect) already
worked but was unexercised and undocumented — it's now locked by API and
resolution-order tests, and README + the openai-compat-asr doc stop
promising a picker that didn't exist / denying one that now does.
Co-authored-by: mergetest <test@local>
Co-authored-by: Claude Fable 5 <noreply@anthropic.com>