To the shell. [...] At least on unixish systems, there is always a shell involved in this process
The #! line, also called shebang, tells nothing to any shell. It's the kernel who interprets it. When the first two bytes of an executable file are #!, the kernel runs the command that follows them, with the parameters specified, and feeds it the whole file on its standard input:
$ cat > a
$ chmod +x a
$ strace ./a 2>&1 | grep -c sh
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