## Summary

This pull request adds one new resource to the **Robustness and Noise Management** section.

- **WFGY Problem Map: Semantic Firewall for RAG Failure Modes**  
  https://github.com/onestardao/WFGY/tree/main/ProblemMap/README.md

## Motivation

While this survey focuses on multimodal RAG, many robustness issues (hallucinations, retrieval drift, document mismatch, ghost matches, etc.) are shared between text-only and multimodal RAG systems.

The WFGY Problem Map is an open MIT-licensed resource that:

- catalogues 16 common failure modes in real-world RAG / LLM pipelines,
- links each failure mode to concrete fixes and design patterns, and
- can be used as a “semantic firewall” layer on top of existing RAG systems.

I think this might be a useful practical reference for readers who are interested in robustness and debugging aspects of RAG in addition to the academic papers already listed.

If you prefer to keep this repository strictly “paper-only”, I am happy to adjust or close the PR.