feat: add v5.8.0 features - transactions, pagination, and comprehensive docs

**Transaction System (TIER 1.2)**
- Atomic operations with automatic rollback
- 36 unit tests + 35 integration tests passing
- Full documentation in docs/transactions.md

**Duplicate Check Optimization (TIER 1.4)**
- Optimized from O(n) to O(log n) using GraphAdjacencyIndex
- Uses LSM-tree for efficient lookups
- Tests verify performance improvements

**GraphIndex Pagination (TIER 1.5)**
- Production-scale pagination for high-degree nodes
- Backward compatible API
- 18 pagination tests passing

**Comprehensive Filter Documentation (TIER 1.6)**
- Complete operator reference (15 operators)
- Compound filters (anyOf, allOf, nested logic)
- Common query patterns and troubleshooting guide
- 642 lines of new documentation

**README Updates**
- Added Filter & Query Syntax Guide to Essential Reading
- Added Transactions to Core Concepts section

All changes tested and production-ready for v5.8.0 release.

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

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

src/transaction/operations/index.ts

@@ -0,0 +1,34 @@
+/**
+ * Transaction Operations
+ *
+ * Re-exports all transactional operations for storage and indexes.
+ * These operations provide atomicity with rollback support.
+ *
+ * @module transaction/operations
+ */
+
+// Storage Operations
+export {
+  SaveNounMetadataOperation,
+  SaveNounOperation,
+  DeleteNounMetadataOperation,
+  SaveVerbMetadataOperation,
+  SaveVerbOperation,
+  DeleteVerbMetadataOperation,
+  UpdateNounMetadataOperation,
+  UpdateVerbMetadataOperation
+} from './StorageOperations.js'
+
+// Index Operations
+export {
+  AddToHNSWOperation,
+  AddToTypeAwareHNSWOperation,
+  RemoveFromHNSWOperation,
+  RemoveFromTypeAwareHNSWOperation,
+  AddToMetadataIndexOperation,
+  RemoveFromMetadataIndexOperation,
+  AddToGraphIndexOperation,
+  RemoveFromGraphIndexOperation,
+  BatchAddToHNSWOperation,
+  BatchAddToMetadataIndexOperation
+} from './IndexOperations.js'