Shell completion still triggers when -- is present in the argument list

Shell completion still triggers when -- is present in the argument list: a task in MiMo-V2.6-RL-harbor-code: MiMo-V2.6-RL Code (Harbor) (Harbor dataset). My app has EnableBashCompletion: true and I rely on -- as the conventional POSIX separator between flags and positional arguments (everything…

The task

My app has `EnableBashCompletion: true` and I rely on `--` as the conventional POSIX separator between flags and positional arguments (everything after `--` should be treated as a plain positional, not as something the parser/completer should reason about — see e.g. https://unix.stackexchange.com/a/11382).

Part of FineEnvs/MiMo-V2.6-RL-harbor-code.