Peen now installs in one command. Both routes build in a pinned Go image, so neither needs a local Go toolchain. - Adds `make install`, which places the built binary at `PREFIX`, defaulting to `~/bin`. It builds first, so it needs Docker and no local Go toolchain, and it warns when `PREFIX` is not on `PATH`. Pass `PREFIX` with `sudo` for a system-wide destination. - Adds `install.sh` at the repository root for a one-shot install: `curl -fsSL https://raw.githubusercontent.com/psyb0t/peen/main/install.sh | bash`. It clones into a temporary directory, builds, installs, and removes the clone on the way out whether or not the build succeeded. `PREFIX` selects the destination and `REF` selects a tag or branch. It requires `git` and `docker` and stops when either is missing. Cloning and running `make install` by hand does the same thing. - The README gains an Install section covering both routes, and docs/deployment.md documents them alongside the existing source, `go install`, and Docker routes. - The README contents list now includes the Docker deployment section the page already carried. - Editorial pass over project comments and documentation prose. No behavior change.