On a 100% private local RAG, replacing nomic-embed-text with bge-m3 and dropping runtime FR→EN translation took recall from 0.45 to 0.95 and cut latency by twelve. Measured, not guessed.
Methodology
A Markdown knowledge base built to last several years, with an AI agent and vector search. Seven design choices are documented along with their costs.
The implicit promise of AI coding assistants was that tests would become a thing of the past. The reality documented by Kent Beck, ThoughtWorks, and several 2025 studies is the opposite: with AI, tests become essential — but the work has shifted.