Exa co-founders Will Bryk, left, and Jeff WangSource: ExaThe venture capital firm Benchmark is backing a new type of search engine built for artificial intelligence agents, not people.The firm is leading an $85 million investment in San Francisco-based Exa Labs Inc., a company that helps AI systems surface the most relevant data from the web. The financing values the company at $700 million — 10 times its valuation in a funding round last year....