### Added
- Gateway discovery now advertises `/api/gateway/audio/transcriptions/models` for STT catalog lookup.
- Added local and proxied STT model catalog responses backed by AbstractCore/AbstractVoice.

### Fixed
- Gateway capability catalogs now map Gateway-scoped voice and vision env vars into the embedded capability registry, so local Gateway deployments expose configured voice/TTS/STT/image models without requiring duplicate lower-level env names.
- Catalog proxy calls now omit unset optional query params instead of forwarding `None` values.

### Changed
- Raised dependency floors to Runtime `>=0.4.10`, Core `>=2.13.13`, Flow `>=0.3.10`, and Voice `>=0.9.3`.
