docs(8.0): Phase F — deep clean across 21 docs

Aligned every public doc to the 8.0 contract: filesystem + memory adapters
only, vector index provider terminology (config.vector with recall +
quantization + persistMode knobs), no cloud storage adapters, no closed-
source product names.

Tier 1 — heavier rewrites:
- docs/architecture/storage-architecture.md
- docs/architecture/data-storage-architecture.md
- docs/architecture/distributed-storage.md DELETED — content was 100%
  cloud-coordination examples with no 8.0 substance.
- docs/guides/distributed-system.md DELETED — same reason; no inbound refs.
- docs/SCALING.md rewritten for single-node guidance.
- docs/PLUGINS.md, docs/augmentations/{COMPLETE-REFERENCE,README}.md:
  HnswProvider→VectorIndexProvider, hnsw→vector key.
- docs/PERFORMANCE.md, docs/BATCHING.md cloud-detection + sharding
  sections replaced with single-node vector tuning + filesystem framing.

Tier 2 — surgical renames + cloud-section deletions:
- architecture/{index,initialization-and-rebuild,overview}.md
- transactions.md, DEVELOPER_LEARNING_PATH.md
- vfs/{VFS_API_GUIDE,COMMON_PATTERNS}.md
- api/README.md, guides/{inspection,import-flow}.md

Tier 3 — light edits:
- docs/README.md, architecture/augmentation-system-audit.md

MIGRATION-V3-TO-V4.md untouched (internal migration doc, no stale terms).

docs/DEVELOPER_LEARNING_PATH.md

@@ -852,7 +852,7 @@ Ready for production deployment? Level 5 covers **planet-scale architecture**.
 ## Level 5: Production Scale (90 minutes)
 
 ### What You'll Learn
-- Cloud storage (GCS, S3, R2)
+- Production filesystem storage and off-site backup
 - Performance optimization
 - Batch imports (CSV, Excel, PDF)
 - Metadata query optimization
@@ -863,18 +863,13 @@ Ready for production deployment? Level 5 covers **planet-scale architecture**.
 ```typescript
 import { Brainy, NounType } from '@soulcraft/brainy'
 
-// 1. PRODUCTION STORAGE - Google Cloud Storage (Native SDK)
-console.log('☁️  Initializing production storage...\n')
+// 1. PRODUCTION STORAGE - Filesystem with off-site snapshots
+console.log('Initializing production storage...\n')
 
 const brain = new Brainy({
   storage: {
-    type: 'gcs-native',  // Native GCS SDK (recommended)
-    gcsNativeStorage: {
-      bucketName: 'my-brainy-production',
-      // ADC (Application Default Credentials) - zero config in Cloud Run/GCE!
-      // Or provide credentials:
-      // keyFilename: '/path/to/service-account.json'
-    }
+    type: 'filesystem',
+    rootDirectory: '/var/lib/brainy'
   },
 
   // Performance tuning
@@ -888,7 +883,8 @@ const brain = new Brainy({
 })
 
 await brain.init()
-console.log('✅ Brainy initialized with GCS Native storage\n')
+console.log('Brainy initialized with filesystem storage')
+console.log('Snapshot /var/lib/brainy off-site via cron with `gsutil rsync` / `aws s3 sync` / `rclone`.\n')
 
 // 2. BATCH IMPORT - CSV File
 console.log('📊 Importing CSV data...\n')
@@ -1044,7 +1040,7 @@ console.log('✅ Brain closed cleanly')
 
 console.log('\n\n🎓 Production Deployment Complete!')
 console.log('\n📚 Key Production Learnings:')
-console.log('  1. Use native cloud storage (GCS, S3, R2) for persistence')
+console.log('  1. Use filesystem storage and snapshot rootDirectory off-site from your scheduler')
 console.log('  2. Batch operations = 100x faster than individual ops')
 console.log('  3. Metadata query optimization for complex filters')
 console.log('  4. Monitor query performance with explain: true')
@@ -1057,41 +1053,22 @@ console.log('  7. Stream large imports with progress callbacks')
 
 #### 1. **Storage Options Comparison**
 
-| Storage | Use Case | Performance | Cost | Setup |
-|---------|----------|-------------|------|-------|
-| Memory | Dev/testing | Fastest | Free | Zero config |
-| Filesystem | Local prod | Fast | Free | Local path |
-| GCS Native | GCP prod | Fast | $$$ | Service account |
-| S3 | AWS prod | Fast | $$$ | Access keys |
-| R2 | Cloudflare | Fast | $ | Access keys |
+| Storage | Use Case | Performance | Setup |
+|---------|----------|-------------|-------|
+| Memory | Dev/testing | Fastest | Zero config |
+| Filesystem | Production | Fast | Local path + scheduled off-site backup |
 
-#### 2. **GCS Native vs S3-Compatible**
+#### 2. **Off-Site Backup**
 
-```typescript
-// ✅ RECOMMENDED: GCS Native SDK
-{
-  storage: {
-    type: 'gcs-native',
-    gcsNativeStorage: {
-      bucketName: 'my-bucket'
-      // ADC handles auth automatically in Cloud Run/GCE!
-    }
-  }
-}
-
-// ⚠️  LEGACY: S3-compatible mode
-{
-  storage: {
-    type: 'gcs',
-    gcsStorage: {
-      bucketName: 'my-bucket',
-      accessKeyId: process.env.GCS_ACCESS_KEY,
-      secretAccessKey: process.env.GCS_SECRET_KEY
-    }
-  }
-}
+```bash
+# Cron / systemd timer / k8s CronJob — pick whatever you already operate
+*/15 * * * *  rclone sync /var/lib/brainy remote:brainy-backup
+*/15 * * * *  aws s3 sync /var/lib/brainy s3://my-bucket/brainy-backup
+*/15 * * * *  gsutil rsync -r /var/lib/brainy gs://my-bucket/brainy-backup
 ```
 
+Brainy itself never reaches out to an object store. Snapshot `rootDirectory` from your scheduler.
+
 #### 3. **Performance Optimization**
 
 ```typescript
@@ -1164,8 +1141,8 @@ const brain = new Brainy({ verbose: true })
 
 #### Before Deployment
 
-- [ ] Choose cloud storage (GCS/S3/R2)
-- [ ] Set up authentication (service account/access keys)
+- [ ] Provision a writable `rootDirectory` on the host
+- [ ] Set up an off-site snapshot job (`rclone` / `aws s3 sync` / `gsutil rsync`)
 - [ ] Configure caching
 - [ ] Test batch operations
 - [ ] Benchmark query performance
@@ -1189,12 +1166,12 @@ const brain = new Brainy({ verbose: true })
 
 ### Practice Exercises
 
-1. Deploy Brainy with GCS Native storage
+1. Deploy Brainy with filesystem storage + scheduled off-site backup
 2. Import a 10,000 row CSV file
 3. Measure query performance for different filters
 4. Optimize a slow query using getOptimalQueryPlan()
 5. Set up monitoring dashboard
-6. Create backup/restore scripts
+6. Test restore from off-site snapshot
 
 ---
 
@@ -1212,7 +1189,7 @@ const brain = new Brainy({ verbose: true })
 
 #### Advanced Topics
 
-- **Distributed Systems**: Sharding, replication, coordination
+- **Multi-instance Deployments**: Run multiple Brainy processes behind your own routing layer
 - **Custom Augmentations**: Extend Brainy with plugins
 - **Streaming Pipelines**: Real-time data ingestion
 - **Security**: Encryption, access control, audit logs
@@ -1223,7 +1200,6 @@ const brain = new Brainy({ verbose: true })
 - 📚 [API Reference](../api/README.md) - Complete API documentation
 - 📁 [VFS Guide](../vfs/VFS_API_GUIDE.md) - Virtual Filesystem deep dive
 - 🤖 [Neural API](../guides/neural-api.md) - Advanced neural operations
-- 🌐 [Distributed Guide](../guides/distributed-system.md) - Planet-scale architecture
 - 💬 [Discord Community](https://discord.gg/brainy) - Get help, share projects
 
 #### Share Your Success