Pass TP4 decode stability gate
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# 实验 EXP-DECODE-BATCH-GRID:BC-8 是否可由稳定 whole-layer b2--b8 curve 修复
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> **状态:** entry gate PASS,待 TP4/b2 GPU smoke
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> **状态:** TP4/b2 stability gate PASS,扩展 full grid
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>
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> Parent campaign:[`../frontier-simulator-gap-campaign-v0/README.md`](../frontier-simulator-gap-campaign-v0/README.md)
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- **Entry gate:** PASS。TP4 1h trace TPOT mean 正偏
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`+10.6%--+23.0%`,E2E mean `+9.8%--+19.2%`;BC-8 完整排序仍错。
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- **观察事实:** 待 GPU。
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- **TP4/b2 smoke:** 两个 fresh-process critical-rank execute mean 分别为
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`4.6263 ms` 和 `4.6201 ms`,跨 repeat CV=`0.067%`,稳定性 gate
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PASS,无需 repeat 3。median=`4.6232 ms`,比旧样本 `5.044 ms` 低
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`0.421 ms`;方向支持 H1,但未达到事前 `>=0.5 ms` 的强证据阈值。
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- **观察事实:** 旧 TP4/b2 的高方差主要是测量不稳定;是否足以修复
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BC-8 仍须 full b2--b8 curve 与 trace replay。
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- **Decision:** 待 GPU。
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