Self-review of #38465 surfaced three real items:
1. SystemExit escape (defense): `_login_nous` raises SystemExit(130)/(1) on
cancel/failure. The logged-out login path inside `_model_flow_nous` catches
it, but the expired-session re-login path (main.py) only catches Exception,
so a Ctrl-C during re-auth could propagate past `_run_portal_one_shot` and
kill the CLI. Add SystemExit to the portal handler so all cancel/abort cases
end with the graceful 'Setup cancelled / retry later' message.
2. Doc sweep: the model-pick step was only added to the bare-`hermes portal`
prose. Propagate it to the surfaces describing `hermes setup --portal`
behavior that still omitted model selection:
- `--portal` argparse help (main.py)
- nous-portal.md intro + the numbered 'what it does' step list (EN + zh-Hans)
- run-hermes-with-nous-portal.md 'default model after setup --portal' line,
which was now contradictory (there's a picker, not a forced default) (EN + zh)
3. Test coverage: add parametrized regression test asserting the portal handler
swallows KeyboardInterrupt / EOFError / SystemExit (returns None, no escape).
Note on 'Skip (keep current)': delegating to _model_flow_nous means picking
Skip preserves the prior provider instead of force-switching to nous — this is
intentional and matches quick setup exactly; docs now say 'sets Nous as your
provider (when you pick a model)' rather than unconditionally.
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