models : replace ggml_tensor** out-params with output structs
The hyper-connection and DSA graph builders wrote their extra outputs
(post / comb gates, carried top-k selections, inject gates) through
ggml_tensor** out-params. Return them in a small struct next to the
primary output instead.
Assisted-by: dsh:llama.cpp/ggml-org/Qwen3.8-Flash-Next-GGUF (MacBook, M5 Max, 128GB)
