The battle for enterprise AI is heating up. Microsoft is bundling Copilot into Office. Google is pushing Gemini into Workspace. OpenAI and Anthropic are selling directly to enterprises. Every SaaS vendor now ships an AI assistant.  In the scramble for the interface, Glean is betting on something less visible: becoming the intelligence layer beneath it.  Seven years ago, Glean set out to be the Google for enterprise — an AI-powered search tool designed to index and search across a company’s SaaS