v1.0.0 — Initial release

What's new

• [FeatureFlags] attribute on an enum generates I{EnumName}Flags interface and {EnumName}Flags sealed class
• IFeatureFlagProvider interface for pluggable flag backends
• InMemoryFeatureFlagProvider — thread-safe, all flags default to disabled
• AFF001 warning when a [FeatureFlags] enum has no members
• Zero dependencies, AOT-safe