Initial commit: Identity management component

- Hierarchical user/device identity system with HD key derivation
- Dependency injection for AsyncStorage and Platform
- Self-contained TypeScript declarations
- Ed25519 keypairs managed by IdentityManager
- Deterministic peer ID generation from BIP39 mnemonic

index.ts

@@ -0,0 +1,31 @@
+/**
+ * Identity Management Component
+ *
+ * Provides hierarchical user/device identity management with HD key derivation
+ *
+ * @module identity/1.0.0
+ */
+
+// Export factory and helper
+export { createIdentityManager, IdentityFactory } from './IdentityFactory';
+export { AsyncStorageAdapter } from './implementations/AsyncStorageAdapter';
+
+// Export implementations (for advanced usage)
+export { IdentityManager } from './implementations/IdentityManager';
+// Export interfaces
+export type {
+  DeviceIdentity,
+  DeviceInfo,
+  IdentityConfig,
+  IIdentityFactory,
+  IIdentityManager,
+  IIdentityStorage,
+  UserIdentity,
+} from './interfaces/IIdentity';
+
+// Note: Default singleton instance removed - must be created with dependencies
+// Use createIdentityManager() with platform and storage dependencies
+
+// Version information
+export const VERSION = '1.0.0';
+export const PROTOCOL_VERSION = '/metatrom/identity/1.0.0';