Sarah, a third-year associate, had been searching for a specific indemnity clause for three hours. meanwhile, a filing deadline loomed. This wasn't just inefficiency—it was *institutional knowledge erosion*. We started by building a **Legal Brain**—a vectorized knowledge graph of every document the firm had ever produced. But we knew accuracy alone wouldn't win trust. In legal practice, *explainability is everything*. So we engineered a citation-first architecture. When an attorney asks a question, the system provides a synthesized response linked directly to source documents with highlighted passages. Today, the firm's knowledge isn't just preserved; it's *activated*. > "This isn't just a search tool. It's like having every partner who ever worked here available for consultation, instantly."