Claude OAuth tokens are short-lived and require refresh. The runtime
HealthCheck (open-sse) already refreshes them successfully, but the
Dashboard test endpoint was missing `refreshable: true` in its config.
This caused the Dashboard to show "auth failed / Token expired" for
Claude providers even though the tokens were being refreshed correctly
at runtime. The codex provider already had this flag set.
Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>
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