Reads the newest web compression, reuses secure connections, and remembers where sites live

A networking release about three things every page load depends on: the format a site is sent in, how many secure connections it takes to fetch it, and how fast the browser can find the servers involved. First, Floati now understands zstd, the newest compression format the big sites are moving to (the largest sites already serve it). Pages sent this way now load correctly, and often arrive smaller, instead of the browser having to ask for an older format. The whole decompressor is built from scratch and defensively: it refuses oversized or malformed data and can never be tricked into runaway memory use. Second, when a site spreads its content across related addresses that live on the same server and share one certificate, Floati now carries them all over a single secure connection instead of setting up a fresh one each time, which skips a slow handshake per address. It only ever reuses a connection for another address after re-checking, in full, that the site's certificate genuinely covers it. Third, the browser now remembers where it found a site for exactly as long as the site says to, and briefly remembers failures, so repeat visits and the many small requests a page makes skip redundant address lookups. This is groundwork as much as polish, part of building the connection layer from scratch to match a mainstream browser and then move past it. Networking moves 59 to 62; overall holds at 70.