fix: prevent circuit breaker activation and data loss during bulk imports

Storage-aware batching system prevents rate limiting issues on cloud storage (GCS, S3, R2, Azure). Replaces entity-by-entity creation with addMany()/relateMany() batch operations in ImportCoordinator. Separate read/write circuit breakers prevent read lockouts during write throttling. Each storage adapter auto-configures optimal batch sizes and delays. Fixes silent data loss and 30+ second lockouts on 1000+ row imports.

🤖 Generated with [Claude Code](https://claude.com/claude-code)

Co-Authored-By: Claude <noreply@anthropic.com>

src/storage/adapters/baseStorageAdapter.ts

@@ -14,6 +14,7 @@ import {
   NounMetadata,
   VerbMetadata
 } from '../../coreTypes.js'
+import { StorageBatchConfig } from '../baseStorage.js'
 import { extractFieldNamesFromJson, mapToStandardField } from '../../utils/fieldNameTracking.js'
 import { getGlobalMutex, cleanupMutexes } from '../../utils/mutex.js'
 
@@ -90,6 +91,33 @@ export abstract class BaseStorageAdapter implements StorageAdapter {
     details?: Record<string, any>
   }>
 
+  /**
+   * Get optimal batch configuration for this storage adapter
+   * Override in subclasses to provide storage-specific optimization
+   *
+   * This method allows each storage adapter to declare its optimal batch behavior
+   * for rate limiting and performance. The configuration is used by addMany(),
+   * relateMany(), and import operations to automatically adapt to storage capabilities.
+   *
+   * @returns Batch configuration optimized for this storage type
+   * @since v4.11.0
+   */
+  public getBatchConfig(): StorageBatchConfig {
+    // Conservative defaults that work safely across all storage types
+    // Cloud storage adapters should override with higher throughput values
+    // Local storage adapters should override with no delays
+    return {
+      maxBatchSize: 50,
+      batchDelayMs: 100,
+      maxConcurrent: 50,
+      supportsParallelWrites: false,
+      rateLimit: {
+        operationsPerSecond: 100,
+        burstCapacity: 200
+      }
+    }
+  }
+
   // NOTE: getAllNouns and getAllVerbs have been removed to prevent expensive full scans.
   // Use getNouns() and getVerbs() with pagination instead.