fix: remove ComputedFrameMetrics re-export from index

Consumers should import SDK types directly from @snap/camera-kit,
consistent with how other SDK types (Lens, LensLaunchData, etc.)
are not re-exported.

Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>

Author: msilivonik-sc

src/index.ts

@@ -1,7 +1,6 @@
 // Main components
 export { CameraKitProvider, useCameraKit } from "./CameraKitProvider";
 export type { MetricEventHandlerFactory } from "./CameraKitProvider";
-export type { ComputedFrameMetrics } from "@snap/camera-kit";
 
 // Logging
 export type { CameraKitLogger, LogLevel } from "./internal/logging";