\section{Robustness}
\label{sec:robustness}
Held-out prompt families give hit rates within 0.01 of the fit families at every capacity (v1 traces), and the transition
predictor's recall drops from 0.53 (fit) to 0.50 (held-out), so the locality statistics are not an artefact of the fitting
prompts. Throughput measurements on the laptop vary by less than 1\,\% across repeats for the all-resident configurations and by
up to 40\,\% across prompt families for demand loading (code prompts route more repetitively than general prose, hence higher
hit rates). Thermal state and competing processes are not yet controlled in the smoke tests reported here; the final sweeps
sample \code{powermetrics} thermal pressure every second and discard runs under throttling.