- AUTH-L1 (confirmed medium): logout() now clears the react-query cache —
the singleton cache survived SPA logout, serving the previous
principal's cached GETs to the next login in the same tab for up to
staleTime with no server round-trip.
- AUTH-L3 (confirmed low): isTokenValid decodes base64url before atob —
valid Cognito JWTs containing '-'/'_' in the payload segment were
misclassified as expired (login lockout/loop; inherited from the old
authSlice).
- AUTH-L2 (unverified, hardened anyway): 401 interceptor broadcasts
AUTH_SESSION_CLEARED_EVENT so AuthProvider drops in-memory state
synchronously, restoring the old Redux atomic-clear semantics.
- INJ-1 (unverified, hardened anyway): Authorization header only set
when the stored token is a string.
Each fix pinned by a test; 63 vitest green, tsc clean.