feat(audience): re-export canTrack and canIdentify from SDK package

Consumer apps (e.g. Play) import from @imtbl/audience, not
@imtbl/audience-core. Re-export the two consent capability functions
so consumers can use them without adding a direct core dependency.

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

Author: ImmutableJeffrey

packages/audience/sdk/src/index.ts

@@ -1,4 +1,4 @@
 export { Audience } from './sdk';
-export { IdentityType } from '@imtbl/audience-core';
+export { IdentityType, canTrack, canIdentify } from '@imtbl/audience-core';
 export type { AudienceConfig } from './types';
 export type { Environment, ConsentLevel, UserTraits } from '@imtbl/audience-core';