Qwen3.8-Flash-Next at 1M context on Strix Halo: 38 tok/s decode, 18 min prefill (halogen 0.12.0)

Hi. I saw some feedback that halogen was degrading at context depth. So I fixed that. Served through the image, same machine, same session, same prompts, 0.11.10 vs 0.12.0: decode at 1,004,581 tokens of context: 27.3 to 38.3 tok/s (default speculative drafter) decode at 258,794: 42.9 to 45.0 prefill