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requirements.txt

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+# httpx
+# openai
+# faiss-cpu
+# python-dotenv
+# xmltodict
+# lxml
+# pydantic
+
+
+# ── Core HTTP / async requests ───────────────────────────────
+httpx>=0.27.0
+
+# ── Retrieval-Augmented Generation (embeddings + FAISS) ─────
+sentence-transformers>=2.5.1       # provides SBERT encoders
+faiss-cpu                          # vector index backend
+
+# ── XML parsing / writing ────────────────────────────────────
+lxml                               # robust XML handling (indent, namespaces)
+xmltodict                          # optional dict↔XML helpers
+
+# ── Environment & config ─────────────────────────────────────
+# python-dotenv>=1.0.1               # load OPENROUTER_API_KEY from .env
+
+# ── Data validation / typing (optional but handy) ────────────
+pydantic>=2.7.0