Interface FeatureFlagRegistry

Registry of feature flag keys and their value types. Consumers augment this interface to get typed autocomplete on useFeatureFlag / useFeatureFlags:

declare module "@repo/feature-flags" {
  interface FeatureFlagRegistry {
    enableCircleV2: boolean;
    "upload-limit": number;
  }
}
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When the registry is empty (no augmentation), flag keys fall back to string so the package works without registration.