first commit

cli/internal/app/reexec_unix.go

@@ -0,0 +1,11 @@
+//go:build !windows
+
+package app
+
+import "syscall"
+
+// reexecSelf replaces the current process with the updated binary.
+// On Unix, this uses execve(2) via syscall.Exec.
+func reexecSelf(execPath string, args []string, env []string) error {
+	return syscall.Exec(execPath, args, env)
+}