feat: add distributed scaling and enterprise features for v3

- Implement distributed coordination with Raft consensus for leader election
- Add horizontal sharding with consistent hashing for data distribution
- Implement read/write separation for scalable primary-replica architecture
- Add cross-instance cache synchronization with version vectors
- Implement intelligent type mapper to prevent semantic degradation
- Add rate limiting augmentation with configurable per-operation limits
- Add comprehensive audit logging for compliance and debugging
- Support for strong and eventual consistency models
- Automatic failover and replication lag monitoring

These features enable true enterprise-scale deployment across multiple nodes

src/distributed/index.ts

@@ -14,6 +14,12 @@ export {
 export { DomainDetector } from './domainDetector.js'
 export { HealthMonitor } from './healthMonitor.js'
 
+// New distributed scaling components
+export { DistributedCoordinator, createCoordinator } from './coordinator.js'
+export { ShardManager, createShardManager } from './shardManager.js'
+export { CacheSync, createCacheSync } from './cacheSync.js'
+export { ReadWriteSeparation, createReadWriteSeparation } from './readWriteSeparation.js'
+
 export type {
   HealthMetrics,
   HealthStatus
@@ -21,4 +27,28 @@ export type {
 
 export type {
   DomainPattern
-} from './domainDetector.js'
+} from './domainDetector.js'
+
+export type {
+  NodeInfo,
+  CoordinatorConfig,
+  ConsensusState
+} from './coordinator.js'
+
+export type {
+  ShardConfig,
+  Shard,
+  ShardAssignment
+} from './shardManager.js'
+
+export type {
+  CacheSyncConfig,
+  CacheEntry,
+  SyncMessage
+} from './cacheSync.js'
+
+export type {
+  ReplicationConfig,
+  WriteOperation,
+  ReplicationLog
+} from './readWriteSeparation.js'