Claude subscription (Max/Pro) chats regressed to 404/502/429 because
FN-7396 rerouted subscription OAuth to a /v1-based `anthropic-subscription`
runtime provider — reintroducing issue #1857 that FN-7391 had fixed. Both
routed the OAuth token to api.anthropic.com/v1, the surface that broke.
Proven in code that v0.51.0 (working) sent subscription OAuth directly to
/v1 via pi-ai's built-in `anthropic` provider (Claude Code impersonation:
Bearer + anthropic-beta oauth headers), NOT through the CLI. Restore that:
- auth-storage: getApiKey("anthropic") resolves subscription/legacy OAuth
again (raw API key still wins), so the built-in provider gets the token.
- pi.ts: remove the runtime reroute and the /v1 `anthropic-subscription`
execution provider so anthropic/* selections stay on the built-in provider.
- register-model-routes: advertise `anthropic` for OAuth users so direct
OAuth is selectable in the picker.
Three independent surfaces, no rerouting: direct OAuth, raw ANTHROPIC_API_KEY
(precedence), and explicit pi-claude-cli.
Fixes#1857
Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>
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