The short version
Message bodies are never stored.
From the systems you connect, Zoe reads the shape of activity: who talked to whom, how often, how fast, and when that changed. Not what was said in Slack. Not one message body, not one line of source. The one exception is what is placed in the case on purpose: your pitch deck, any data-room files, and the Founder Call transcript, which Zoe reads to build and test the Claim Ledger.