MystenLabs/walrus — reverse-engineered prompt

I want this repo turned into a working local setup for Walrus, basically a decentralized blob storage service where I can store and retrieve files, with Sui handling the coordination side. Please build it from source, make sure the main client and node binaries work, and set up the easiest local testbed so I can run everything on my machine without guessing through the docs.

What I care about most is being able to start the local network, run a storage node, use the client to store a file, then fetch or verify it so I know the full flow works. If there are already scripts, examples, Docker setups, or test commands in the repo, use those instead of inventing a new approach. I would also like a very short README update or run guide with the exact commands to build, start, test, and shut it down.

If anything is unclear, look up the current Walrus docs online and follow the documented setup as closely as possible.