Verify the following for each documented pipeline:
sink caps match the intended preprocessing mode;
preprocess-configis present only for internal PPE;PPE input buffers are compatible VVAS memory or importable DMA-BUF;
no-PPE VART HW input is not system memory;
external preprocessing produces the exact model tensor;
CPU-written DMA-BUF input is synchronized before device read;
repeated runs with identical input produce deterministic output.