Per the final reviewer's suggestion: the gpu_offloaded cross-check
(gpu_layers >= model.n_layer()) is trivially true when use_gpu since
we always pass u32::MAX. The check documents intent and is future-
proofed if we ever pass specific N, but a future reader might
simplify it away as dead code. Inline comment points at the spec's
out-of-scope follow-up for true residency observability.
Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>
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