Document 8-GPU harness ablation results for qwen27b and qwen235b prefill

Add completed experiment results from dash0 runs after 2026-05-13:
- qwen27b chat 0-8k: harness +118.6% over no-harness (0.2696 vs 0.1233 req/s/GPU)
- qwen235b prefill TTFT 3s/6s/9s: harness +76.8% (0.3921 vs 0.2217 req/s/GPU)

Mark old 7-GPU and pre-5/13 docs as superseded. Update implementation
log with completed run status.
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2026-05-16 21:23:16 +08:00
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# qwen235b Thinking Prefill Harness Ablation, 2026-05-10
**Superseded** by `qwen235b-thinking-prefill-ttft-3s6s9s-20260514.md` (updated SLO thresholds, 8-GPU setup). This document is retained for reference only.
## Setup
- Host: `dash0`