fix(audio): address CoreML VAD review feedback

CHANGELOG.md

@@ -6,6 +6,17 @@ This project is expected to follow a Conventional Commits style workflow.
 
 ## [Unreleased]
 
+### Added
+
+- Apple CoreML-backed Silero VAD is now the preferred Apple voice
+  activity detector when the private sibling `silero-coreml` SwiftPM
+  package is available; WebRTC VAD remains the runtime fallback.
+
+### Changed
+
+- Apple platform floors are raised to iOS 16 and macOS 13 while the
+  CoreML VAD package is linked.
+
 ## [v1.0.0-rc.1] — MVP Public release candidate
 
 This is the first release candidate for the MVP public release per