This removes the `codex responses-api-proxy` subcommand in favor of running it as a standalone CLI. As part of this change, we: - remove the dependency on `tokio`/`async/await` as well as `codex_arg0` - introduce the use of `pre_main_hardening()` so `CODEX_SECURE_MODE=1` is not required --- [//]: # (BEGIN SAPLING FOOTER) Stack created with [Sapling](https://sapling-scm.com). Best reviewed with [ReviewStack](https://reviewstack.dev/openai/codex/pull/4404). * #4406 * __->__ #4404 * #4403
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