Adventures in SSH and SFTP: Getting Logs When the Host Won’t Help

The Scenario: So we had this situation: we needed to grab some logs from a client's website to see if anything was going ahem "cactus" with the site (that's the technical term, of course). Ideally, you'd just log into a hosting dashboard and click on a "Logs" section, right? Unfortunately, our site was hosted on Pantheon, and Pantheon wasn't about to ju…