Create pattern_memory_namespace_split.md

ProblemMap/GlobalFixMap/Agents_Orchestration/patterns/pattern_memory_namespace_split.md

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+# Pattern: Memory Namespace Split
+
+**Problem**  
+Agents overwrite or re-assert stale facts after refresh. Different tools write to the same memory without fences.
+
+**When to use**  
+Any multi-agent or tool-rich pipeline where memories persist across runs or threads.
+
+**Recipe**
+1) Create namespaces per role or tool: `agent/<name>`, `tool/<name>`, `session/<id>`.
+2) Stamp every write with `mem_rev` and `mem_hash`.
+3) Read policy: prefer `session` then `agent` then `tool`.
+4) Write policy: do not merge across namespaces without a reducer function.
+5) Gate responses when `mem_rev` is older than the current `index_hash` snapshot.
+
+**Acceptance**
+- No stale fact re-entry in three paraphrase tests.
+- λ stays convergent before and after memory refresh.
+
+**Related fixes**
+- [Multi-Agent Problems](https://github.com/onestardao/WFGY/blob/main/ProblemMap/Multi-Agent_Problems.md)  
+- [Data Contracts](https://github.com/onestardao/WFGY/blob/main/ProblemMap/data-contracts.md)  
+- [Retrieval Traceability](https://github.com/onestardao/WFGY/blob/main/ProblemMap/retrieval-traceability.md)