The Authentication cards pass an explicit credential-instance id, which sent
dashboard subscription logins through loginInstance. That seam mapped the card
to the anthropic-subscription storage row id and passed it verbatim to
ModelRuntime.login, which pi rejects with 'Unknown provider:
anthropic-subscription' (GitHub #3462) — every subscription login failed while
the credential path itself was healthy. loginInstance now reuses the
Anthropic-aware login seam (upstream login as 'anthropic', credential relocated
to the anthropic-subscription row) with a regression test.
Co-Authored-By: Claude Fable 5 <noreply@anthropic.com>
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