README.md and docs/proxy-key-onboarding.md were edited by later commits (b996b1f,24d749b) that the litellm-pgvector revert didn't touch, so they still named the now-removed MEMORY_RETRIEVAL_EMBEDDING_KEY var. Left docs/research/langchain-pgvector-vs-litellm-pgvector.md as-is — it's a dated record of the decision being reversed, not live config. Co-Authored-By: Claude Sonnet 5 <noreply@anthropic.com> Claude-Session: https://claude.ai/code/session_018WHfjWrSEcGhCoeu6dQfDa