Add comprehensive benchmark suite with performance report

- Benchmark suite covers CRUD, queries, traversal, transactions
- Fixed boolean property handling (SQLite uses integers 0/1)
- Results: 38K ops/sec for updates, 3.5K ops/sec for node creation
- All performance goals met: queries <10ms, traversal <50ms, creation <1ms
- 23 benchmarks, 1,320 total operations tested
- Database size: 344 KB for test dataset

Author: michaeloboyle