Add reference-scalar llama.cpp solutions (naive scalar baseline, 16 defs)

Add llama.cpp baseline solutions (baseline-llamacpp-arm, 16 defs)

Update definition and workload for CV model kernels:

Resolve conflict and recover nn kernel traces

local snapshot before syncing with HF

Replace pre-PR#15 conv2d-only trace with current simd-loop set (definitions + workloads + reference/autovec solutions)

reset convolution kernel definition, workload, and solution; cin now is an axe of input shape

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Update bench-trace: sync definitions, solutions, workloads, traces (#1)

Add simd-loop reference-scalar solutions (self-contained, harness embedded)

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