v0.4.8

Client test-analyst directive sharpening: the client analyst is now explicitly steered to CHECK an AC's layer and NEVER anchor a kind:"client" test to an API/service/Infra-layer AC (a client harness mocks the response envelope, so it cannot verify a backend contract). Covers a backend AC's clause in a behavior/fitness item instead. This aligns the L1 author directive with the deterministic checkClientKindLayerCoherence gate so the first pass is conformant, plus a regression guard. Pins scm-utils 0.2.51 (unchanged).