| # LLM + embedding provider (optional). | |
| # Leave OPENAI_API_KEY unset to run fully offline with the built-in | |
| # deterministic hashing embedder — great for tests, demos, and CI. | |
| OPENAI_API_KEY="" | |
| OPENAI_BASE_URL="" | |
| EMBED_MODEL="text-embedding-3-small" | |
| CHAT_MODEL="gpt-4o-mini" | |
| # Where the vector index is persisted. | |
| LUMEN_INDEX_DIR=".lumen_index" | |