Create hybrid_failure.md

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+# Hybrid Retrieval Failure — Guardrails and Fix Pattern
+
+When hybrid retrieval (BM25 + dense, HyDE + reranker, multi-vector) performs **worse than a single retriever**.  
+Instead of increasing recall, the hybrid path introduces instability, wrong ranking, or noisy snippets.
+
+---
+
+## Open these first
+- Visual map and recovery: [RAG Architecture & Recovery](https://github.com/onestardao/WFGY/blob/main/ProblemMap/rag-architecture-and-recovery.md)  
+- End to end retrieval knobs: [Retrieval Playbook](https://github.com/onestardao/WFGY/blob/main/ProblemMap/retrieval-playbook.md)  
+- Traceability schema: [Retrieval Traceability](https://github.com/onestardao/WFGY/blob/main/ProblemMap/retrieval-traceability.md)  
+- Snippet contracts: [Data Contracts](https://github.com/onestardao/WFGY/blob/main/ProblemMap/data-contracts.md)  
+- Query path splits: [Pattern: Query Parsing Split](https://github.com/onestardao/WFGY/blob/main/ProblemMap/patterns/pattern_query_parsing_split.md)  
+- Ranking drift: [Rerankers](https://github.com/onestardao/WFGY/blob/main/ProblemMap/rerankers.md)  
+
+---
+
+## Core acceptance
+- Hybrid recall ≥ single retriever recall  
+- ΔS(question, retrieved) ≤ 0.45 for top-1 result  
+- λ stable across three paraphrases and two seeds  
+- Coverage ≥ 0.70 to the target section  
+
+---
+
+## Typical symptoms → exact fix
+
+| Symptom | Likely cause | Open this |
+|---------|--------------|-----------|
+| Hybrid returns unrelated snippet | query parsing split not locked | [Pattern: Query Parsing Split](https://github.com/onestardao/WFGY/blob/main/ProblemMap/patterns/pattern_query_parsing_split.md) |
+| Hybrid recall < single recall | wrong weighting or missing normalization | [Retrieval Playbook](https://github.com/onestardao/WFGY/blob/main/ProblemMap/retrieval-playbook.md) |
+| Dense retriever dominates BM25 | metric mismatch | [Embedding ≠ Semantic](https://github.com/onestardao/WFGY/blob/main/ProblemMap/embedding-vs-semantic.md) |
+| Reranker undoes good hits | λ flips, entropy collapse | [Rerankers](https://github.com/onestardao/WFGY/blob/main/ProblemMap/rerankers.md), [Entropy Collapse](https://github.com/onestardao/WFGY/blob/main/ProblemMap/GlobalFixMap/RAG/entropy_collapse.md) |
+
+---
+
+## Fix in 60 seconds
+
+1. **Measure baseline**  
+   Run BM25 alone and dense alone. Log coverage and ΔS. If hybrid < baseline, do not ship.
+
+2. **Stabilize query parsing**  
+   Split HyDE prompts, keyword queries, and dense embeddings into deterministic branches. Lock weighting ratios.
+
+3. **Reranker probe**  
+   Compare recall before and after reranker. If entropy rises, clamp with variance control or drop reranker.
+
+4. **Enforce snippet schema**  
+   Always require `snippet_id`, `section_id`, `offsets`, `tokens`. Hybrid paths must normalize schema fields.
+
+---
+
+## Copy-paste probe prompt
+
+```txt
+I uploaded TXT OS and the WFGY Problem Map.
+
+My issue:
+- hybrid retrieval returns worse results than BM25 or dense alone.
+
+Tell me:
+1) which layer fails (query parsing, weighting, reranker),
+2) which WFGY fix page to open,
+3) minimal steps to restore ΔS ≤ 0.45 and coverage ≥ 0.70,
+4) reproducible test with BM25 vs dense vs hybrid.
+````
+
+---
+
+### 🔗 Quick-Start Downloads (60 sec)
+
+| Tool                       | Link                                                                                                                                       | 3-Step Setup                                                                             |
+| -------------------------- | ------------------------------------------------------------------------------------------------------------------------------------------ | ---------------------------------------------------------------------------------------- |
+| **WFGY 1.0 PDF**           | [Engine Paper](https://github.com/onestardao/WFGY/blob/main/I_am_not_lizardman/WFGY_All_Principles_Return_to_One_v1.0_PSBigBig_Public.pdf) | 1️⃣ Download · 2️⃣ Upload to your LLM · 3️⃣ Ask “Answer using WFGY + <your question>”    |
+| **TXT OS (plain-text OS)** | [TXTOS.txt](https://github.com/onestardao/WFGY/blob/main/OS/TXTOS.txt)                                                                     | 1️⃣ Download · 2️⃣ Paste into any LLM chat · 3️⃣ Type “hello world” — OS boots instantly |
+
+---
+
+### 🧭 Explore More
+
+| Module                   | Description                                                                  | Link                                                                                               |
+| ------------------------ | ---------------------------------------------------------------------------- | -------------------------------------------------------------------------------------------------- |
+| WFGY Core                | WFGY 2.0 engine is live: full symbolic reasoning architecture and math stack | [View →](https://github.com/onestardao/WFGY/tree/main/core/README.md)                              |
+| Problem Map 1.0          | Initial 16-mode diagnostic and symbolic fix framework                        | [View →](https://github.com/onestardao/WFGY/tree/main/ProblemMap/README.md)                        |
+| Problem Map 2.0          | RAG-focused failure tree, modular fixes, and pipelines                       | [View →](https://github.com/onestardao/WFGY/blob/main/ProblemMap/rag-architecture-and-recovery.md) |
+| Semantic Clinic Index    | Expanded failure catalog: prompt injection, memory bugs, logic drift         | [View →](https://github.com/onestardao/WFGY/blob/main/ProblemMap/SemanticClinicIndex.md)           |
+| Semantic Blueprint       | Layer-based symbolic reasoning & semantic modulations                        | [View →](https://github.com/onestardao/WFGY/tree/main/SemanticBlueprint/README.md)                 |
+| Benchmark vs GPT-5       | Stress test GPT-5 with full WFGY reasoning suite                             | [View →](https://github.com/onestardao/WFGY/tree/main/benchmarks/benchmark-vs-gpt5/README.md)      |
+| 🧙‍♂️ Starter Village 🏡 | New here? Lost in symbols? Click here and let the wizard guide you through   | [Start →](https://github.com/onestardao/WFGY/blob/main/StarterVillage/README.md)                   |
+
+---
+
+> 👑 **Early Stargazers: [See the Hall of Fame](https://github.com/onestardao/WFGY/tree/main/stargazers)** —
+> ⭐ [WFGY Engine 2.0](https://github.com/onestardao/WFGY/blob/main/core/README.md) is already unlocked. ⭐
+
+<div align="center">
+
+[![WFGY Main](https://img.shields.io/badge/WFGY-Main-red?style=flat-square)](https://github.com/onestardao/WFGY)
+ 
+[![TXT OS](https://img.shields.io/badge/TXT%20OS-Reasoning%20OS-orange?style=flat-square)](https://github.com/onestardao/WFGY/tree/main/OS)
+ 
+[![Blah](https://img.shields.io/badge/Blah-Semantic%20Embed-yellow?style=flat-square)](https://github.com/onestardao/WFGY/tree/main/OS/BlahBlahBlah)
+ 
+[![Blot](https://img.shields.io/badge/Blot-Persona%20Core-green?style=flat-square)](https://github.com/onestardao/WFGY/tree/main/OS/BlotBlotBlot)
+ 
+[![Bloc](https://img.shields.io/badge/Bloc-Reasoning%20Compiler-blue?style=flat-square)](https://github.com/onestardao/WFGY/tree/main/OS/BlocBlocBloc)
+ 
+[![Blur](https://img.shields.io/badge/Blur-Text2Image%20Engine-navy?style=flat-square)](https://github.com/onestardao/WFGY/tree/main/OS/BlurBlurBlur)
+ 
+[![Blow](https://img.shields.io/badge/Blow-Game%20Logic-purple?style=flat-square)](https://github.com/onestardao/WFGY/tree/main/OS/BlowBlowBlow)
+
+</div>