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Shapes a civil year of resolved days into the value a template renders
against. This layer is why the engine can stay logic-less: a month grid
needs leading blank cells, week bucketing and an in-month test, and a
logic-less template can compute none of it.
Both weeks and days are offered at every level -- the booklet walks
days, the grid walks weeks -- so the two artefacts cannot drift.
Colours are six booleans, not hex: hex bakes a presentation policy into
the engine, and LaTeX, groff and HTML each want a different colour
expression. Asserted: exactly one of the six is true on every day of a
whole year, so a template keying off them can never get none or two.
Padding cells carry every field a real day carries, empty, so a template
never hits a missing key mid-grid.
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