add more architecture docs

architecture/llm_client.md

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+# LLM Client
+
+A quick wrapper over openai apis
+
+## Responsibilities
+
+- Transform "normal" chat/completions requests into graphs
+- Translate graphs into LLM requests
+- Keep a history of graphs parsed by it
+  - On Policy Data
+  - Deduplicating graphs, so we don't keep previous history as separate graphs
+
+## How to use
+Exactly the same as the openai api! Just with the additional support of graph inputs and outputs.