propers: add the Terce/Sext/None hymns

Fixed, self-contained text (including each hymn's own final doxology
stanza) — unlike Prime's/Compline's hymns, these don't change by season,
so there's no appendDoxology split. Verified against Divinum Officium
(Monastic Tridentinum 1617).

Co-Authored-By: Claude Sonnet 5 <noreply@anthropic.com>

src/data/propers/common/none-hymn.yml

@@ -0,0 +1,43 @@
+# Verified against Divinum Officium (Monastic Tridentinum 1617). Fixed
+# hymn for None, invariant by season (per explicit user direction) — the
+# whole text including its own final doxology stanza is self-contained,
+# not run through hymn-doxology.ts the way Prime's/Compline's hymns are.
+# Same Latin doxology as Terce/Sext ("Praesta, Pater piissime...") but a
+# distinct English translation, matching this hymn's own different meter.
+id: none-hymn
+text:
+  la: |
+    Rerum, Deus, tenax vigor,
+    Immótus in te pérmanens,
+    Lucis diúrnæ témpora
+    Succéssibus detérminans:
+
+    Largíre clarum véspere,
+    Quo vita nusquam décidat,
+    Sed prǽmium mortis sacræ
+    Perénnis instet glória.
+
+    Præsta, Pater piíssime,
+    Patríque compar Únice,
+    Cum Spíritu Paráclito
+    Regnans per omne sǽculum.
+    Amen.
+  en: |
+    O strength and stay upholding all creation,
+    Who ever dost thyself unmoved abide,
+    Yet day by day the light in due gradation
+    From hour to hour through all its changes guide:
+
+    Grant to life's day a calm unclouded ending,
+    An eve untouched by shadows of decay,
+    The brightness of a holy death-bed blending
+    With dawning glories of th' eternal day.
+
+    Hear us, O Father, gracious and forgiving,
+    And thou, O Christ, the co-eternal Word,
+    Who, with the Holy Ghost, by all things living
+    Now and to endless ages art adored.
+    Amen.
+status:
+  la: verified
+  en: verified