Initial commit: standalone vector memory server

REST API for per-agent semantic memory retrieval.

- FastAPI server with /api/{agent}/save and /api/{agent}/query
- ChromaDB for persistent vector storage
- all-MiniLM-L6-v2 via sentence-transformers for embeddings
- Per-agent collections for clean separation
- Config through env vars or config.py
- .venv ready with all dependencies

.gitignore

@@ -0,0 +1,30 @@
+# Python
+__pycache__/
+*.py[cod]
+*.egg-info/
+dist/
+build/
+
+# Virtual environment
+.venv/
+venv/
+env/
+
+# IDE / editors
+.vscode/
+.idea/
+*.swp
+*.swo
+*~
+
+# OS
+.DS_Store
+Thumbs.db
+
+# ChromaDB data (persisted vectors — sacred, not in repo)
+*.sqlite3
+chroma_data/
+
+# Environment overrides
+.env
+.env.local