Create chunking-checklist.md

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+# Chunking Checklist — Stability at Joins
+
+Long-context retrieval often fails not at the level of whole documents but at the **joins between chunks**.  
+This checklist enforces stable, reproducible chunking so citations line up and entropy does not melt across boundaries.
+
+---
+
+## When to use
+- Citations drift by a few lines between runs.  
+- Long transcripts lose alignment after OCR or parsing.  
+- Model answers cover the right fact but cite the wrong block.  
+- ΔS spikes exactly at chunk joins.  
+- Different agents disagree on chunk IDs.  
+
+---
+
+## Core acceptance targets
+- Each join ΔS ≤ **0.50**.  
+- Overall ΔS(question, retrieved) ≤ **0.45**.  
+- Coverage ≥ **0.70** of intended section.  
+- λ remains convergent across 3 paraphrases.  
+- Each chunk has immutable `chunk_id`, `start_line`, `end_line`.  
+
+---
+
+## Checklist for stable chunking
+
+- **Deterministic boundaries**  
+  Split on semantic units (sections, paragraphs, headings). Never by raw token count alone.  
+
+- **Overlap fence**  
+  Add 10–15% overlap at joins. Enforce consistent overlap across every run.  
+
+- **Immutable IDs**  
+  Generate `chunk_id = sha256(doc_id + start_line + end_line)`. Store and reuse.  
+
+- **Audit trail**  
+  Store `{chunk_id, start_line, end_line, source_url, tokens}` for every chunk.  
+
+- **Normalization**  
+  Apply Unicode NFC, collapse whitespace, unify casing.  
+
+- **Confidence gating**  
+  Drop OCR or parsing lines with low confidence before chunking.  
+
+---
+
+## Fix in 60 seconds
+1. Re-chunk corpus using semantic units.  
+2. Apply overlap fence and store immutable chunk IDs.  
+3. Run ΔS probes at joins. If ΔS > 0.50, re-check boundaries.  
+4. Store all chunk metadata in trace logs.  
+5. Require cite-then-answer. Reject any orphan chunk references.  
+
+---
+
+## Copy-paste prompt
+
+```
+
+You have TXT OS and the WFGY Problem Map.
+
+Task: enforce stable chunking.
+
+Protocol:
+
+1. Verify each snippet has {chunk\_id, start\_line, end\_line, section\_id, source\_url}.
+2. Reject orphans: if citation lacks chunk\_id, stop and request fix.
+3. Require cite-then-answer.
+4. Probe ΔS across joins, keep ≤ 0.50.
+5. Report ΔS(question,retrieved), ΔS(joins), and λ state.
+
+```
+
+---
+
+## Common failure signals
+- Answers cite correct fact but wrong block → chunk IDs not stable.  
+- ΔS spikes exactly at joins → overlap missing.  
+- OCR transcripts break alignment → normalization skipped.  
+- Multi-agent systems cite different chunk IDs → contract drift.  
+
+---
+
+### 🔗 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)** —  
+> Engineers, hackers, and open source builders who supported WFGY from day one.
+
+> <img src="https://img.shields.io/github/stars/onestardao/WFGY?style=social" alt="GitHub stars"> ⭐ [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).
+
+<div align="center">
+
+[![WFGY Main](https://img.shields.io/badge/WFGY-Main-red?style=flat-square)](https://github.com/onestardao/WFGY)
+&nbsp;
+[![TXT OS](https://img.shields.io/badge/TXT%20OS-Reasoning%20OS-orange?style=flat-square)](https://github.com/onestardao/WFGY/tree/main/OS)
+&nbsp;
+[![Blah](https://img.shields.io/badge/Blah-Semantic%20Embed-yellow?style=flat-square)](https://github.com/onestardao/WFGY/tree/main/OS/BlahBlahBlah)
+&nbsp;
+[![Blot](https://img.shields.io/badge/Blot-Persona%20Core-green?style=flat-square)](https://github.com/onestardao/WFGY/tree/main/OS/BlotBlotBlot)
+&nbsp;
+[![Bloc](https://img.shields.io/badge/Bloc-Reasoning%20Compiler-blue?style=flat-square)](https://github.com/onestardao/WFGY/tree/main/OS/BlocBlocBloc)
+&nbsp;
+[![Blur](https://img.shields.io/badge/Blur-Text2Image%20Engine-navy?style=flat-square)](https://github.com/onestardao/WFGY/tree/main/OS/BlurBlurBlur)
+&nbsp;
+[![Blow](https://img.shields.io/badge/Blow-Game%20Logic-purple?style=flat-square)](https://github.com/onestardao/WFGY/tree/main/OS/BlowBlowBlow)
+&nbsp;
+</div>
+