Merge branch 'ef-triduum-litanies': the Sacred Triduum's Latin identity

Gives Holy Thursday, Good Friday and Holy Saturday the names the Missal
prints for them, taken from each Office's own running header: 'Feria V
in Cena Domini', 'Feria VI in Passione et Morte Domini', 'Sabbato
sancto'. Rank and colour were already correct; only the identity was
missing, the same shape the Holy Family had. The slug is deliberately
unchanged -- it is the lectionary key -- and the names are Latin, which
avoids promoting an English value from the oracle the engine is checked
against.

Not 'Feria VI Parasceve': that phrase occurs zero times as a title in
either photographic scan, appearing only inside the Johannine Passion
text, and RG 132(a) writes 'feriae VI in Passione et Morte Domini'.

Output is byte-identical across all 8417 years -- colitur day prints no
name column -- but layer 5 does see it: describe gained name_la, and
reverting the change reddens six pins.

The Major Litanies (RG 80) and the Rogation Wednesday commemoration were
investigated to the same depth, scan-verified, cited, and deliberately
not built. Rogation Wednesday is genuinely blocked: Easter+38 coincides
with the Ascension Vigil, so no Fixed date-spec can anchor it. The Major
Litanies are tractable in the rite module -- the two blockers first
recorded for them were false, and are retracted here -- but 25 April is
St Mark, II class, so under RG 111(c) a privileged Litanies
commemoration would displace the day's existing ordinary commemoration
in ~97.7% of years. That blast radius is unmeasured, and measuring it is
the prerequisite for its own task.

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