Author Sunday's own Matins hymn and every season's (Advent-Paschaltide)

The "genuinely more complex, not-yet-understood two-hymn mechanism"
flagged for Sunday turned out simple: Day0 Hymnus ("Nocte surgéntes")
is just Sunday's plain per-annum hymn, and Day0 Hymnus1 ("Primo
diérum ómnium") is Septuagesima-tide's own separate seasonal hymn --
the same shape Advent/Lent/Passiontide/Paschaltide each already have.
Live-verified these 4 don't vary by weekday within their season (a
Lenten Sunday and a Lenten feria render identically). None of the 6
were authored at all before this -- every Sunday and every season day
not otherwise overridden by a winning saint/octave silently fell
through to Monday's own ferial placeholder text.

Authored matins-hymn-{sunday,septuagesima,advent,lent,passiontide,
paschaltide}.yml, all live-verified, self-contained with their own
real closing doxology baked in. Septuagesima is checked directly by
day.season in resolveMatinsHymn itself, deliberately not folded into
the shared seasonalOfficeSuffix (Lauds/Vespers have no matching
content yet -- resolveOfficeBundle there is all-or-nothing per feast,
so adding it would silently blank their chapter/hymn instead of
falling through to their current weekday default).

Known, flagged simplification: the generic Paschaltide hymn wrongly
applies during the Ascension octave, whose own real hymn isn't
authored anywhere yet -- a same-shape gap Lauds already has, not a
new regression. Updated 2 FERIAL_DATE (a Tuesday in Advent) hymn
assertions that had been asserting Tuesday's own ferial text --
Advent's own seasonal hymn correctly outranks the weekday cycle now.

Co-Authored-By: Claude Sonnet 5 <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_01AGjUyhUZJaSjiniEmnLdak

src/data/propers/common/matins-hymn-passiontide.yml

@@ -0,0 +1,170 @@
+# Passiontide's own Matins hymn ("Pange, lingua, gloriósi prœ́lium
+# certáminis" — the Passiontide recension of Venantius Fortunatus' hymn,
+# distinct from Lent's own "Ex more docti mýstico" used up to this point).
+# Live-verified against both Passion Sunday itself (2026-03-22) and a
+# plain Passiontide feria (2026-03-24, a Tuesday) — byte-identical, so
+# this season doesn't vary its Matins hymn by weekday. This particular
+# breviary recension is 5 stanzas, ending after the Incarnation/manger
+# stanza — it does not continue into the "Lustra sex qui iam peracta..."
+# stanzas some other uses of this hymn carry. Self-contained with its own
+# closing doxology stanza baked in (a fixed, unique ending, "Glória, et
+# honor Deo..." — not the shared weekday doxology).
+id: matins-hymn-passiontide
+text:
+  la: >-
+    Pange, lingua, gloriósi
+
+    Prœlium certáminis,
+
+    Et super Crucis trophǽo
+
+    Dic triúmphum nóbilem,
+
+    Quáliter Redémptor orbis
+
+    Immolátus vícerit.
+
+
+    De paréntis protoplásti
+
+    Fraude Factor cóndolens,
+
+    Quando pomi noxiális
+
+    Morsu in mortem córruit,
+
+    Ipse lignum tunc notávit,
+
+    Damna ligni ut sólveret.
+
+
+    Hoc opus nostræ salútis
+
+    Ordo depopóscerat,
+
+    Multifórmis proditóris
+
+    Ars ut artem fálleret,
+
+    Et medélam ferret inde,
+
+    Hostis unde lǽserat.
+
+
+    Quando venit ergo sacri
+
+    Plenitúdo témporis,
+
+    Missus est ab arce Patris
+
+    Natus, orbis Cónditor,
+
+    Atque ventre virgináli
+
+    Carne amíctus pródiit.
+
+
+    Vagit infans inter arcta
+
+    Cónditus præsépia:
+
+    Membra pannis involúta
+
+    Virgo Mater álligat:
+
+    Et manus, pedésque, et crura
+
+    Stricta cingit fáscia.
+
+
+    Glória, et honor Deo
+
+    Usqueqáque Altíssimo,
+
+    Una Patri, Filióque;
+
+    Inclyto Paráclito:
+
+    Cui laus est et potéstas,
+
+    Per ætérna sǽcula. Amen.
+  en: >-
+    Sing, my tongue, the glorious battle
+
+    Sing the last, the dread affray;
+
+    O'er the cross, the victor's trophy,
+
+    Sound the high triumphal lay:
+
+    Tell how Christ, the world's Redeemer,
+
+    As a victim won the day.
+
+
+    God, his Maker, sorely grieving
+
+    That the first-made Adam fell,
+
+    When he ate the fruit of sorrow,
+
+    Whose reward was death and hell,
+
+    Noted then this wood, the ruin
+
+    Of the ancient wood to quell.
+
+
+    For the work of our salvation
+
+    Needs would have his order so,
+
+    And the multiform deceiver's
+
+    Art by art would overthrow,
+
+    And from thence would bring the med'cine
+
+    Whence the insult of the foe.
+
+
+    Wherefore, when the sacred fullness
+
+    Of the appointed time was come,
+
+    This world's Maker left his Father,
+
+    Sent the heav'nly mansion from,
+
+    And proceeded, God Incarnate,
+
+    Of the Virgin's holy womb.
+
+
+    Weeps the infant in the manger
+
+    That in Bethlehem's stable stands;
+
+    And his limbs the Virgin Mother
+
+    Doth compose in swaddling bands,
+
+    Meetly thus in linen folding
+
+    Of her God the feet and hands.
+
+
+    To the Trinity be glory
+
+    Everlasting, as is meet;
+
+    Equal to the Father, equal
+
+    To the Son, and Paraclete:
+
+    Trinal Unity, whose praises
+
+    All created things repeat. Amen.
+status:
+  la: verified
+  en: verified