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Marc-André Bombeck
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The target is the day's own pleasantness; the inputs are the other four self-ratings, the numbers and closed vocabularies of the day's context, and the figures the sleep, activity and recovery modules already hold. Nothing is imputed. A day missing one of the selected inputs is a day the fit does not see, and a feature nobody recorded on most days never becomes a column in the first place — the coverage floor is what keeps the complete-case rule from quietly emptying the matrix. A day with no context row contributes no work-status column at all, rather than a zero that would read as "worked a regular day". Columns are standardised against the account's own window, so a person whose stress never passes six does not have six read as the maximum. Candidates are screened with the machinery the rest of the product already runs — Pearson at the shared paired floor, Benjamini-Hochberg at the shared FDR, the shared effect-size floor on the shrunk estimate — because a sweep over sixty features at raw p < 0.05 finds three things that are not there. The fit is a ridge solved in closed form, validated on expanding windows in date order. The training range ends exactly where the validation range starts, asserted on the fold indices and on the day keys, not on the resulting error: a leaking split passes an error check whenever the leak is small, which is when nobody looks. The band is the central 80% of the validation residuals, so it widens when the model is bad instead of staying confidently narrow. The window read is the linked resolver's own engine, extended to answer many days in one query rather than growing a second opinion about what a Tuesday looked like.