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Both process-wide negative caches were filled with errors from a fetch driven by the caller's context, so an unauthenticated client that aborted a request which hit a cache miss wrote its own context.Canceled into a 5-minute shared failure cache -- also blocking the owner's admin panel. The outbound fetch at both sites is now driven by a server-owned context (WithoutCancel plus a 30s timeout), so caller cancellation can no longer reach the cache while genuine upstream failures are still cached. Verified by a panel of agents; the added tests fail against an unpatched base with a poisoned cache, and the pre-existing error-caching tests still pass. The missing singleflight on CheckForUpdate is pre-existing and unchanged. Co-Authored-By: Claude Opus 5 (1M context) <noreply@anthropic.com>