Added three new integration test scenario documents:
- Scenario 11: IO System Stress Test - Tests IntraIO pub/sub with pattern matching, batching, backpressure, and thread safety
- Scenario 12: DataNode Integration Test - Tests IDataTree with hot-reload, persistence, hashing, and performance on 1000+ nodes
- Scenario 13: Cross-System Integration - Tests IO + DataNode working together with config hot-reload chains and concurrent access
Also includes comprehensive DataNode system architecture analysis documentation.
These scenarios complement the existing test suite by covering the IO communication layer and data management systems that were previously untested.
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Co-Authored-By: Claude <noreply@anthropic.com>
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