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  "limits": [
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    "Selection/commit, GPU, wall, and rank-interval observations are descriptive scheduler samples, not per-request timing attribution or a causal bottleneck claim.",
    "Rank intervals overlap and are not summed; their spread is not synchronization wait. Wall minus GPU time is not pure CPU overhead.",
    "Graph dimensions are capacities rather than executed token counts; retained shape cost is a prior observation, not a submitted-plan estimate.",
    "Trace capture is separate from ABBA timing and cannot clear numerical, protected-performance, host-transfer, or promotion gates."
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