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+# ❓ FAQ — Fast Answers for Busy Builders
+
+Short, practical answers to the questions we get every day.
+
+> **Quick Nav**
+> [Getting Started](./getting-started.md) ·
+> [RAG Map 2.0](./rag-architecture-and-recovery.md) ·
+> [Retrieval Playbook](./retrieval-playbook.md) ·
+> [Rerankers](./rerankers.md) ·
+> [Patterns](./patterns/README.md) ·
+> [Eval](./eval/README.md) ·
+> [Ops](./ops/README.md)
+
+---
+
+## General
+
+**What is WFGY?**
+A symbolic reasoning layer + diagnostic toolkit that sits *above* your stack. It measures semantic stress (ΔS), shows which layer drifted (λ_observe), and applies repair operators (BBMC/BBPF/BBCR/BBAM). You don’t need to change your infra.
+
+**Do I need a GPU?**
+No. You can prototype on CPU with small embedding models. Rerankers and local LLMs benefit from GPU but are optional. See: [Retrieval Playbook](./retrieval-playbook.md).
+
+**License? Can I use it at work?**
+MIT. Commercial use allowed. If you ship improvements, we welcome PRs (docs or code).
+
+**How is this different from LangChain/LlamaIndex?**
+Those are orchestration layers. **WFGY is a reasoning firewall and diagnostic map**—it detects/repairs *semantic* failure regardless of framework.
+
+---
+
+## Setup & scope
+
+**What’s the fastest way to try it?**
+Grab **TXT OS** and **WFGY 1.0 PDF**, paste TXT into any model, and follow the prompts in [Getting Started](./getting-started.md).
+
+**Which embedding model should I start with?**
+General docs: `all-MiniLM-L6-v2` (light) or `bge-base`. Multilingual: `bge-m3` / `LaBSE`. Keep **write/read normalization identical**. See: [Embedding vs Semantic](./embedding-vs-semantic.md).
+
+**Do I need a reranker?**
+Only if first-stage **recall@50 ≥ 0.85** but Top-k precision is weak. Otherwise fix candidate generation. See: [Rerankers](./rerankers.md).
+
+**How big can my PDFs be?**
+Start with a **gold set** (10–50 Q/A with citations). For ingestion, chunk by semantic sections (not fixed tokens). Verify ΔS thresholds before scaling.
+
+---
+
+## Diagnosing failures
+
+**The chunks look right but the answer is wrong—now what?**
+Measure **ΔS(question, retrieved)**. If ≥ 0.60, fix retrieval first; if ≤ 0.45 and reasoning still fails, open **Interpretation Collapse**.
+Links: [hallucination.md](./hallucination.md) · [retrieval-collapse.md](./retrieval-collapse.md)
+
+**Hybrid (BM25 + dense) got worse—why?**
+Likely **Query Parsing Split** (tokenizer/analyzer drift). Unify analyzers and log per-retriever queries.
+Link: [pattern_query_parsing_split.md](./patterns/pattern_query_parsing_split.md)
+
+**Citations bleed across sources.**
+Enforce **per-source fences** + “cite-then-explain” schema; this is **SCU**.
+Links: [retrieval-traceability.md](./retrieval-traceability.md) · [pattern_symbolic_constraint_unlock.md](./patterns/pattern_symbolic_constraint_unlock.md)
+
+**Fixes don’t stick after refresh.**
+You’re seeing **Memory Desync**. Stamp `mem_rev`/`mem_hash`, gate writes, and audit traces.
+Link: [pattern_memory_desync.md](./patterns/pattern_memory_desync.md)
+
+---
+
+## Implementation details
+
+**How do I compute ΔS quickly?**
+Use cosine on unit-normalized sentence embeddings: `ΔS = 1 − cos(I, G)`.
+Thresholds: `<0.40` stable · `0.40–0.60` transitional · `≥0.60` act.
+Ground anchor `G` can be a section title/snippet you expect.
+
+**What are BBMC/BBPF/BBCR/BBAM in one line?**
+- **BBMC** — minimize semantic residue vs anchors.
+- **BBPF** — branch safely across multiple paths.
+- **BBCR** — detect collapse; insert a bridge node and restart cleanly.
+- **BBAM** — modulate attention variance to avoid entropy melt.
+
+**Where are the data shapes?**
+See: [Data Contracts](./data-contracts.md). They’re JSON-first, easy to log, and versioned.
+
+---
+
+## Teams & Ops
+
+**How do we avoid regressions?**
+Commit `goldset.jsonl`, measure **recall@50**, **nDCG@10**, and ΔS across PRs.
+Links: [eval_rag_precision_recall.md](./eval/eval_rag_precision_recall.md) · [eval_semantic_stability.md](./eval/eval_semantic_stability.md)
+
+**Any privacy guidance?**
+Yes—PII redaction, retention, access control, and provider governance patterns are here: [Privacy & Governance](./privacy-and-governance.md).
+
+---
+
+## Known limits
+
+- Extremely noisy OCR may require **manual anchors** or **char-level retrieval**.
+- Cross-domain abstract reasoning (#11/#12) needs stronger models.
+- Rerankers improve precision but add latency—**prove gains** via nDCG.
+
+---
+
+### 🧭 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)** —
+> Engineers, hackers, and open source builders who supported WFGY from day one.
+
+> 
⭐ [WFGY Engine 2.0](https://github.com/onestardao/WFGY/blob/main/core/README.md) is already unlocked. ⭐ Star the repo to help others discover it and unlock more on the [Unlock Board](https://github.com/onestardao/WFGY/blob/main/STAR_UNLOCKS.md).
+
+
+
+[](https://github.com/onestardao/WFGY)
+
+[](https://github.com/onestardao/WFGY/tree/main/OS)
+
+[](https://github.com/onestardao/WFGY/tree/main/OS/BlahBlahBlah)
+
+[](https://github.com/onestardao/WFGY/tree/main/OS/BlotBlotBlot)
+
+[](https://github.com/onestardao/WFGY/tree/main/OS/BlocBlocBloc)
+
+[](https://github.com/onestardao/WFGY/tree/main/OS/BlurBlurBlur)
+
+[](https://github.com/onestardao/WFGY/tree/main/OS/BlowBlowBlow)
+
+
+
+---
+