There's a moment in every engineer's life where they're two weeks into building something, surrounded by Docker configs and cron jobs and a spreadsheet tracking proxy rotation, and they think: "Someone must sell this as a service." And someone does. Several someones, actually. The question is whether paying them makes you clever or lazy. I've been on both sides of that line. Ran my own headless Chrome fleet on Hetzner for a couple of months, complete with a homegrown retry queue and a Grafana dashboard I was unreasonably proud of. Worked a treat until Cloudflare changed their fingerprinting and the entire pipeline went sideways. Was looking at managed options by the end of the week. This is Part 3 of the browser tools series. Same framing throughout: how do you give your coding agents the right browser infrastructure for a closed loop of research, build, and validate? Not consumer browsing, not manual QA. Agent-driven validation of what you're shipping. Part 1 covered the low-level tools.…