pi >=0.80.8 moved session request auth to ModelRuntime.getAuth -> pi-ai
resolveProviderAuth, which reads credentials.read("anthropic") and refreshes an
OAuth credential via credentials.modify("anthropic"). Fusion stores the
subscription login under `anthropic-subscription` with no raw `anthropic` row,
so the refresh callback saw current===undefined, bailed, and auth resolved to
undefined -> "Provider is not configured: anthropic" (then fell back).
Resolve read("anthropic") through fusion's getApiKey (refresh + raw/legacy/
subscription/fallback precedence) and hand pi-ai a ready api_key credential;
pi-ai routes it as OAuth by the sk-ant-oat token prefix. Supersedes the prior
read-alias, which fixed lookup but not the broken OAuth refresh-via-modify path.
Verified end-to-end: ModelRuntime.getAuth(anthropic/opus) now resolves the
subscription token instead of returning undefined.
Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>
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