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PR #10475 fixed SoundDetection in-flight tracking, but the underlying trap remains: InFlightTrackingClient embedded the whole grpc.Backend interface "for passthrough of untracked methods", so any newly added inference method is silently satisfied by the embedded passthrough and never wrapped with track(). That leaves onFirstComplete unfired and in-flight stuck at 1 - the exact SoundDetection bug, waiting to recur for the next backend method. Close the gap at the type level instead of relying on reviewers to remember: - Split grpc.Backend into two composed sub-interfaces: InferenceBackend (methods that are one discrete inference call and must be tracked) and ControlBackend (control-plane calls plus the streaming constructors whose work spans the returned stream, safe to pass through). The classification now lives next to the interface it documents. - InFlightTrackingClient embeds only grpc.ControlBackend and implements every InferenceBackend method explicitly, delegating to an inner InferenceBackend. A `var _ grpc.Backend = (*InFlightTrackingClient)(nil)` assertion makes the package fail to compile if any inference method is left unwrapped. Now adding a method to InferenceBackend is a build error (at the assertion and every call site: "does not implement grpc.Backend (missing method X)"), not a silent runtime leak - and the obvious fix is to copy a neighbouring wrapper, which calls track(). No runtime guard or reviewer vigilance required. Pure refactor: the composed Backend interface is identical to the old flat one, so all implementers and consumers are unaffected (verified with a full `go build ./...`). Behaviour is unchanged; the existing nodes suite passes. Assisted-by: Claude:claude-opus-4-8 [Claude Code] Signed-off-by: Ettore Di Giacinto <mudler@localai.io> Co-authored-by: Ettore Di Giacinto <mudler@localai.io>