feat: simplify GCS storage naming and add Cloud Run deployment options

Changes:
- **NEW**: type: 'gcs' now uses native @google-cloud/storage SDK (more intuitive!)
- **DEPRECATED**: type: 'gcs-native' is deprecated (use 'gcs' instead)
- **NEW**: Add skipInitialScan option to skip bucket scan on init (fixes Cloud Run timeouts)
- **NEW**: Add skipCountsFile option to disable counts persistence
- **NEW**: Add 2-minute timeout to bucket scans with helpful error messages
- **IMPROVED**: Better error handling and recovery for bucket scan failures
- **IMPROVED**: Automatic detection of HMAC keys routes to S3CompatibleStorage
- **IMPROVED**: Backward compatibility maintained - all existing configs still work

Migration Guide:
- If using type: 'gcs-native' → Change to type: 'gcs' (or remove type, it auto-detects)
- If using HMAC keys with gcsStorage → Consider migrating to ADC for better performance
- For Cloud Run timeouts → Add skipInitialScan: true to gcsNativeStorage config

Why This Fixes the Waitlist Bug:
- Cloud Run containers were timing out during bucket scans
- skipInitialScan option allows bypassing expensive bucket scans
- Timeout handling prevents silent failures
- Better error messages guide users to solutions

Resolves issue where GCS native adapter was confusingly named 'gcs-native'
while legacy S3-compatible mode used 'gcs'. Now 'gcs' correctly uses the
native SDK by default, as users expect. Previous configs continue to work.

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

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

src/brainy.ts

@@ -2912,31 +2912,27 @@ export class Brainy<T = any> implements BrainyInterface<T> {
    */
   private normalizeConfig(config?: BrainyConfig): Required<BrainyConfig> {
     // Validate storage configuration
-    if (config?.storage?.type && !['auto', 'memory', 'filesystem', 'opfs', 'remote', 's3', 'r2', 'gcs', 'gcs-native'].includes(config.storage.type)) {
-      throw new Error(`Invalid storage type: ${config.storage.type}. Must be one of: auto, memory, filesystem, opfs, remote, s3, r2, gcs, gcs-native`)
+    if (config?.storage?.type && !['auto', 'memory', 'filesystem', 'opfs', 'remote', 's3', 'r2', 'gcs', 'gcs-native', 'azure'].includes(config.storage.type)) {
+      throw new Error(`Invalid storage type: ${config.storage.type}. Must be one of: auto, memory, filesystem, opfs, remote, s3, r2, gcs, gcs-native, azure`)
     }
 
-    // Validate storage type/config pairing (catch common mismatches)
+    // Warn about deprecated gcs-native
+    if (config?.storage?.type === ('gcs-native' as any)) {
+      console.warn('⚠️  DEPRECATED: type "gcs-native" is deprecated. Use type "gcs" instead.')
+      console.warn('   This will continue to work but may be removed in a future version.')
+    }
+
+    // Validate storage type/config pairing (now more lenient)
     if (config?.storage) {
       const storage = config.storage as any
 
-      // Check for gcs/gcsNativeStorage mismatch
-      if (storage.type === 'gcs' && storage.gcsNativeStorage) {
-        throw new Error(
-          `Storage type/config mismatch: type 'gcs' requires 'gcsStorage' config object (S3-compatible). ` +
-          `You provided 'gcsNativeStorage' which requires type 'gcs-native'. ` +
-          `Either change type to 'gcs-native' or use 'gcsStorage' instead of 'gcsNativeStorage'.`
-        )
+      // Warn about legacy gcsStorage config with HMAC keys
+      if (storage.gcsStorage && storage.gcsStorage.accessKeyId && storage.gcsStorage.secretAccessKey) {
+        console.warn('⚠️  GCS with HMAC keys (gcsStorage) is legacy. Consider migrating to native GCS (gcsNativeStorage) with ADC.')
       }
 
-      // Check for gcs-native/gcsStorage mismatch
-      if (storage.type === 'gcs-native' && storage.gcsStorage) {
-        throw new Error(
-          `Storage type/config mismatch: type 'gcs-native' requires 'gcsNativeStorage' config object. ` +
-          `You provided 'gcsStorage' which requires type 'gcs' (S3-compatible). ` +
-          `Either change type to 'gcs' or use 'gcsNativeStorage' instead of 'gcsStorage'.`
-        )
-      }
+      // No longer throw errors for mismatches - storageFactory now handles this intelligently
+      // Both 'gcs' and 'gcs-native' can now use either gcsStorage or gcsNativeStorage
     }
 
     // Validate model configuration