Pin llama.cpp 45c1770: HRX fuses ZAYA's residual scale - #230

- **Fused residual scale (llama.cpp #35).** ZAYA scales both residual branches twice per layer,
  `(x + bx) * sx + (r + br) * sr`, which ran as up to nine ADD / MUL dispatches per layer. Each side
  now runs as one dispatch (`common.res_scale_pair.*`, `ops/res_scale_pair_f32.loom`): 3,366 -> 3,165
  dispatches per token, bitwise the same output, ZAYA1-8B HRX0 decode 67.0 -> ~69.6 tok/s and
  pp512 2,109 -> 2,183. `GGML_HRX_DISABLE_DISPATCH=res_scale_pair` turns it off. At decode most of
  a ZAYA token is small dispatches and the ~1.8 us gaps between them, not matmuls; the profiler
  (`HRX_PROFILE_MODE=dispatch`) shows which ones. Profile through `llama-server`: `llama-bench`
  under the profiler fails.