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(** Shapes a civil year of resolved days into the value a template renders
    against (spec section 4).

    This layer exists because a month grid needs leading blank cells, week
    bucketing and an "is this cell in the current month" test, and a logic-less
    template can compute none of it. Shaping the data here keeps the engine
    logic-less AND makes the grid template trivial. The view model IS the design.

    Both [weeks] and [days] are offered at every level: the booklet walks
    [days], the grid walks [weeks]. One model, two artefacts, no second code
    path that could drift.

    Colours are exposed as six booleans rather than a hex string: hex would bake
    a presentation policy into the engine, and LaTeX, groff and HTML each want a
    different colour expression. Exactly one of the six is true on every day. *)

val of_days :
  vocab:('s, 'r) Colitur_kernel.Vocab.t ->
  rite:string ->
  year:int ->
  ('s, 'r) Colitur_kernel.Liturgical_day.t list ->
  Template.value
(** [of_days ~vocab ~rite ~year days] where [days] is one civil year, 1 January
    to 31 December, in order. Pure and total. *)