Docs idea: add a small RAG failure mode checklist for Verba users

[onestardao]

Hi Verba maintainers, thank you.

Suggestion
Add a small “RAG failure mode checklist” section to help users understand common failure patterns in RAG apps.

What it includes

• typical symptoms users see
• map each to a stable failure-mode code (16 codes)
• minimal first checks and fixes

Reference taxonomy
WFGY Problem Map (No 1 to No 16):
https://github.com/onestardao/WFGY/blob/main/ProblemMap/README.md

Scope
Docs-only. If you want, I can draft it and open a PR.

[onestardao]

Hi, following up briefly.

The WFGY 2.0 RAG 16 Problem Map is now referenced or adopted by 20+ repos across the ecosystem, including RAGFlow, LlamaIndex, ToolUniverse (Harvard MIMS Lab), Rankify, and the Multimodal RAG Survey (QCRI LLM Lab), along with multiple curated awesome lists.

Given that traction, I wanted to reconfirm whether it would make sense to include it here as a debugging / evaluation resource.

If aligned, I can submit a minimal one-line PR in your preferred format.

Appreciate the work you’re doing on this list.