A welcome-tier 403 classifies as auth_permanent, so the desktop's error
surface mapped it to "Your Nous Portal sign-in expired" with a Nous Portal
re-login button — the chat sentence never reached the user. Terminal results
on the free route now carry a structured free_tier block (kind + the chat
sentence); agent/error_surface.py turns it into a free_tier_<kind> code on
the provider layer with the sentence as `message`. The desktop gives those
codes their own titles, shows the backend sentence as the body, and offers
"Sign in with a Nous account" (the free-tier dialog) instead of the OAuth
re-login, with Retry only where a later send can succeed.
Co-Authored-By: Claude Fable 5.1 <noreply@anthropic.com>
Robin Fernandes
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