ORGANIZE: Move documentation to proper directories

- Moved API design docs to docs/api-design/
- Moved planning docs to docs/planning/
- Root now only contains standard repo files (README, LICENSE, etc.)
- Keeps CLAUDE.md and PLAN.md uncommitted for privacy

Clean root directory for better project organization.

docs/api-design/API-QUICK-REFERENCE.md

@@ -0,0 +1,62 @@
+# 🧠 Brainy 2.0 Quick Reference Card
+
+## Core Operations
+```typescript
+// Nouns
+await brain.addNoun(vector, metadata)     // Create
+await brain.getNoun(id)                   // Read
+await brain.updateNoun(id, vector?, meta?) // Update  
+await brain.deleteNoun(id)                // Delete
+
+// Verbs
+await brain.addVerb(source, target, type) // Create relationship
+await brain.getVerb(id)                   // Get relationship
+await brain.deleteVerb(id)                // Delete relationship
+
+// Metadata
+await brain.getNounMetadata(id)           // Get metadata only
+await brain.updateNounMetadata(id, meta)  // Update metadata only
+await brain.hasNoun(id)                   // Check existence
+```
+
+## Search
+```typescript
+await brain.search(query, k?)             // Vector search
+await brain.searchText('natural language') // NLP search
+await brain.findSimilar(id, k?)           // Similarity search
+await brain.find(tripleQuery)             // Triple Intelligence 🧠
+```
+
+## Graph
+```typescript
+await brain.getConnections(id)            // All connections
+await brain.getVerbsBySource(id)          // Outgoing
+await brain.getVerbsByTarget(id)          // Incoming
+await brain.getVerbsByType(type)          // By type
+```
+
+## Management
+```typescript
+brain.getCacheStats()                      // Cache stats
+brain.clearCache()                         // Clear cache
+brain.size()                              // Total count
+await brain.getStats()                    // All statistics
+await brain.clear()                       // Clear all data
+```
+
+## Lifecycle
+```typescript
+const brain = new BrainyData()            // Create
+await brain.init()                        // Initialize
+await brain.shutdown()                    // Cleanup
+```
+
+## Configuration
+```typescript
+new BrainyData({
+  storage: 'auto',      // auto | memory | filesystem | s3
+  cache: true,          // Enable caching
+  index: true,          // Enable indexing
+  dimensions: 384       // Vector dimensions
+})
+```