### Fixed
- Gateway capability discovery now builds its embedded capability registry with Gateway-scoped media configuration, keeping discovery contracts aligned with the concrete voice, TTS, STT, and image catalog routes.
- Gateway media catalog proxy calls now avoid forwarding unset optional query params, preventing stale `None` values from breaking downstream capability discovery.

### Changed
- Raised dependency floors to Runtime `>=0.4.11`, Core `>=2.13.14`, Flow `>=0.3.11`, Vision `>=0.3.5`, and Voice `>=0.9.4`.
