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Mistral's quota-exhausted response is a bare 401 with a contentless
{"detail":"Unauthorized"} body — byte-identical to a genuinely revoked
key. classifyFailure() in the connection-test route always resolved
this to upstream_auth_error ("Invalid API key"), hiding the real
quota-exhaustion cause and misleading operators into rotating a still-
valid key.
classifyFailure() now accepts an optional `provider` and, for a bare
Mistral 401 with no explicit auth signal in the message (no "invalid
api key" / "token invalid" / "revoked" / "access denied" text), returns
`upstream_ambiguous_auth_or_quota` instead. A Mistral 401 that DOES
carry an explicit auth signal, and any non-Mistral 401, are unaffected
and still classify as upstream_auth_error (baseline preserved).
The new branching logic lives in a new module
(mistralAmbiguousAuth.ts) rather than inline in route.ts, keeping that
frozen file's line count within its file-size-baseline.json budget.
TDD: tests/unit/provider-test-mistral-401-classify.test.ts reproduces
the bug (RED against unfixed classifyFailure), proves the fix (GREEN),
and pins the baseline non-Mistral-401 behavior per the owner's
explicit requirement.