Run an end-to-end gfx1151 serving qualification sweep

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Objective

Run a reproducible end-to-end serving qualification sweep for the fork's gfx1151 path after runtime blockers and image provenance are resolved.

Related fork issues

• Evaluate official-release ROCm gfx1151 image path for Strix Halo #4 owns coherent ROCm/Torch image provenance and ABI stability.
• Reproduce and resolve gfx1151 EngineCore model-load segfault #14 owns the EngineCore model-load segfault.

Test matrix

• Context-length scalability through the selected model's supported range.
• Deterministic quality probes plus a named evaluation suite where applicable.
• Cold/warm TTFT, prefill throughput, decode throughput, and concurrency scaling.
• Peak unified memory, graph-reserved memory, KV-cache capacity, and host-memory headroom.
• Backend-selection evidence proving intended gfx1151 AITER/Triton/HIP paths run without CPU fallback.

Record exact model revision, quantization, ROCm/Torch/vLLM revisions, launch settings, prompt/output lengths, repetitions, and summary statistic.

Acceptance criteria

• All blocking correctness and crash issues are linked to minimized reproducers.
• Results are captured in a machine-readable artifact and concise comparison table.
• No hidden CPU fallback or unsupported FP8/FP4/MLA path is presented as acceleration.
• Any serving migration proposal names its reference backend and requires API/quality compatibility plus equal-or-better latency/throughput on the agreed workload.