Or: why every browser-automation MCP uses Chromium, and why that's the wrong default on macOS. The problem I kept hitting Every browser automation MCP server I tried on my Mac — chrome-devtools-mcp, playwright-mcp, browsermcp, puppeteer-mcp — did the same thing: spin up a fresh Chromium instance with nothing in it. No logins, no cookies, no session state. Then my AI agent would spend the first 5