backend redesign

backend.old/config.yaml

@@ -0,0 +1,20 @@
+www_port: 8080
+server_port: 8081
+
+# Agent configuration
+agent:
+  model: "claude-sonnet-4-20250514"
+  temperature: 0.7
+  context_docs_dir: "memory"  # Context docs still loaded from memory/
+
+# Local memory configuration (free & sophisticated!)
+memory:
+  # LangGraph checkpointing (SQLite for conversation state)
+  checkpoint_db: "data/checkpoints.db"
+
+  # ChromaDB (local vector DB for semantic search)
+  chroma_db: "data/chroma"
+
+  # Sentence-transformers model (local embeddings)
+  # Options: all-MiniLM-L6-v2 (fast, small), all-mpnet-base-v2 (better quality)
+  embedding_model: "all-MiniLM-L6-v2"