Create mixed_locale_metadata.md

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+# Mixed Locale Metadata — Guardrails and Fix Pattern
+
+A focused fix when **language, script, or region metadata** is inconsistent across files, snippets, headers, analyzers, or indexes. Use this page to normalize BCP-47 tags, align analyzers and encoders, and lock the schema so retrieval stays stable.
+
+---
+
+## Open these first
+- Why this snippet and how it was chosen: [Retrieval Traceability](https://github.com/onestardao/WFGY/blob/main/ProblemMap/retrieval-traceability.md)  
+- Contract fields you must carry end to end: [Data Contracts](https://github.com/onestardao/WFGY/blob/main/ProblemMap/data-contracts.md)  
+- Tokenizer picked the wrong rules: [tokenizer_mismatch.md](https://github.com/onestardao/WFGY/blob/main/ProblemMap/GlobalFixMap/LanguageLocale/tokenizer_mismatch.md)  
+- Sources mix scripts in one turn: [script_mixing.md](https://github.com/onestardao/WFGY/blob/main/ProblemMap/GlobalFixMap/LanguageLocale/script_mixing.md)  
+- Full and half width digits or punctuation drift: [digits_width_punctuation.md](https://github.com/onestardao/WFGY/blob/main/ProblemMap/GlobalFixMap/LanguageLocale/digits_width_punctuation.md)  
+- Accents and folding collapse meaning: [diacritics_and_folding.md](https://github.com/onestardao/WFGY/blob/main/ProblemMap/GlobalFixMap/LanguageLocale/diacritics_and_folding.md)  
+- Locale choice flips between runs: [locale_drift.md](https://github.com/onestardao/WFGY/blob/main/ProblemMap/GlobalFixMap/LanguageLocale/locale_drift.md)  
+- CJK segmentation and wordbreak checks: [cjk_segmentation_wordbreak.md](https://github.com/onestardao/WFGY/blob/main/ProblemMap/GlobalFixMap/LanguageLocale/cjk_segmentation_wordbreak.md)  
+- RTL and BiDi control safety: [rtl_bidi_control.md](https://github.com/onestardao/WFGY/blob/main/ProblemMap/GlobalFixMap/LanguageLocale/rtl_bidi_control.md)  
+- Transliteration pipelines and romanization: [transliteration_and_romanization.md](https://github.com/onestardao/WFGY/blob/main/ProblemMap/GlobalFixMap/LanguageLocale/transliteration_and_romanization.md)
+
+---
+
+## When to use this page
+- Corpus claims `lang=en` in headers while HTML meta, PDF tags, or file paths imply non-English.  
+- Index analyzer set to `standard` but crawler stamped `lang=zh-Hant` or `lang=ja`.  
+- Mixed `lang` values inside one document after conversions or merges.  
+- Query comes from a UI locale while the text is in another, leading to wrong analyzer or stopword set.  
+- Re-ingest does not update stale `lang/script/region` fields and recall becomes unstable.
+
+---
+
+## Acceptance targets
+- **ΔS(question, retrieved) ≤ 0.45** on three paraphrases.  
+- **Coverage ≥ 0.70** to the intended section.  
+- **λ stays convergent** across two seeds after metadata normalization.  
+- **E_resonance flat** on long windows after analyzer alignment.
+
+---
+
+## The core problem
+Most stacks carry **only `lang`** and drop **`script`** and **`region`**, or they conflate **UI locale** with **content locale**. Encoders and analyzers then guess. That guess diverges from retrieval, chunking, and ranking, which raises ΔS and flips λ.
+
+---
+
+## 60-second fix
+1) **Detect**  
+   - Run lightweight LID on both **raw source** and **post-parser text**. Keep the probability.  
+   - If `p_top − p_second < 0.20`, mark the snippet **mixed** and route to re-chunk.
+
+2) **Normalize**  
+   - Stamp **BCP-47** tags as three fields: `lang`, `script`, `region` where known.  
+   - Normalize Unicode to **NFC** for CJK and most Latin, **NFKC** only when you must collapse width.
+
+3) **Align analyzers and encoders**  
+   - Choose analyzer by `(lang, script)` rather than UI locale.  
+   - Record `analyzer_id`, `encoder_id`, `normal_form` in the snippet.
+
+4) **Verify**  
+   - Re-rank with a deterministic reranker.  
+   - Recompute ΔS and λ across 3 paraphrases, two seeds. Ship if targets pass.
+
+---
+
+## Minimal contract you must carry
+Add these keys to your snippet schema. See the full table in [Data Contracts](https://github.com/onestardao/WFGY/blob/main/ProblemMap/data-contracts.md).
+
+```json
+{
+  "snippet_id": "doc:123#p4",
+  "lang": "zh",
+  "script": "Hant",
+  "region": "TW",
+  "normal_form": "NFC",
+  "analyzer_id": "icu_zh_Hant",
+  "encoder_id": "e5-multilingual",
+  "lid": { "label": "zh-Hant", "p": 0.93, "method": "cld3|fasttext" },
+  "source_meta": { "declared_lang": "en-US", "html_meta_lang": "zh-Hant", "pdf_lang": "zh" }
+}
+````
+
+**Rules**
+
+* Prefer **content-derived** LID over HTTP headers or file paths.
+* If `declared_lang` disagrees with LID, trust LID and record the disagreement.
+* Never mix snippets with different `(lang, script)` into the same chunk group.
+
+---
+
+## Quick diagnosis → fix
+
+* Answers oscillate per run although facts exist
+  → The analyzer follows UI locale. Lock analyzer by snippet fields. See [Retrieval Traceability](https://github.com/onestardao/WFGY/blob/main/ProblemMap/retrieval-traceability.md).
+
+* High similarity yet wrong meaning
+  → Encoded with a multilingual model but index analyzer used wrong token rules. Rebuild with aligned analyzer. See [embedding-vs-semantic.md](https://github.com/onestardao/WFGY/blob/main/ProblemMap/embedding-vs-semantic.md).
+
+* Mixed half width, punctuation, or digits break matching
+  → Normalize to NFC or NFKC per policy and re-index. See [digits\_width\_punctuation.md](https://github.com/onestardao/WFGY/blob/main/ProblemMap/GlobalFixMap/LanguageLocale/digits_width_punctuation.md).
+
+* Script switches mid-paragraph
+  → Split at the switch and stamp each part. See [script\_mixing.md](https://github.com/onestardao/WFGY/blob/main/ProblemMap/GlobalFixMap/LanguageLocale/script_mixing.md).
+
+* CJK recall dips after parser change
+  → Check wordbreak rules and ICU configs. See [cjk\_segmentation\_wordbreak.md](https://github.com/onestardao/WFGY/blob/main/ProblemMap/GlobalFixMap/LanguageLocale/cjk_segmentation_wordbreak.md).
+
+---
+
+## Copy-paste prompt for your LLM step
+
+```
+I uploaded TXT OS and WFGY Problem Map.
+
+My issue looks like mixed locale metadata:
+- declared vs detected lang differ,
+- analyzer_id does not match (lang, script),
+- ΔS(question, retrieved) = {value}, λ = {state}
+
+Tell me:
+1) which layer is failing and why,
+2) the exact WFGY page to open,
+3) the minimal steps to align BCP-47, analyzer, and encoder,
+4) a reproducible test that verifies ΔS ≤ 0.45 and λ convergent.
+Use BBMC/BBCR/BBAM when relevant.
+```
+
+---
+
+### 🔗 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)
+ 
+[![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>