perf: make getRelations() pagination consistent and efficient

**Problem**: Pagination behavior was inconsistent across different query patterns:
- getRelations({ from: id, limit: 10 }) fetched ALL relationships then sliced
- getRelations({ limit: 10 }) paginated at storage layer
- storage.getVerbs() offset parameter wasn't being passed to adapters

**Root Cause**:
1. getRelations() used different code paths for from/to vs no-filter queries
2. storage.getVerbs() called getVerbsWithPagination without offset
3. Then tried to slice results, which failed for paginated queries

**Solution**:
- Unified getRelations() to ALWAYS use storage.getVerbs() with pagination
- Fixed storage.getVerbs() to convert offset to cursor for adapters
- All query patterns now paginate efficiently at storage layer
- Eliminated inefficient "fetch all then slice" pattern

**Performance Impact**:
- Before: getRelations({ from: entityId, limit: 10 }) on entity with 1000 relationships = 1000 fetched
- After: Only 10 fetched ✅
- All tests passing (14/14)

**Breaking**: None - fully backward compatible

CHANGELOG.md

@@ -11,6 +11,9 @@ All notable changes to this project will be documented in this file. See [standa
   - Fixed critical bug where `brain.getRelations()` returned `[]` instead of all relationships
   - Added support for retrieving all relationships with pagination (default limit: 100)
   - Added string ID shorthand syntax: `brain.getRelations(entityId)` as alias for `brain.getRelations({ from: entityId })`
+  - **Performance**: Made pagination consistent - now ALL query patterns paginate at storage layer
+  - **Efficiency**: `getRelations({ from: id, limit: 10 })` now fetches only 10 instead of fetching ALL then slicing
+  - Fixed storage.getVerbs() offset handling - now properly converts offset to cursor for adapters
   - Production safety: Warns when fetching >10k relationships without filters
   - Fixed broken method calls in improvedNeuralAPI.ts (replaced non-existent `getVerbsForNoun` with `getRelations`)
   - Fixed property access bugs: `verb.target` → `verb.to`, `verb.verb` → `verb.type`