Add the Most Holy Name of Jesus (Jan 2) as a proper temporal feast

Historically a floating Sunday (Jan 2-5, fixed to Jan 2 when no Sunday
falls there); per direct instruction this is instead fixed to Jan 2
every year for simplicity. Adds the feast's collect, Magnificat/
Benedictus antiphons, full Lauds psalmody, capitulum, the three-part
"Jesu dulcis memoria" hymn cycle (Vespers/Matins/Lauds), the Invitatory
antiphon, versicles, and two Matins nocturn readings (both St. Bernard
of Clairvaux), sourced from Tempora/Nat2-0.txt. Reuses the `fixed-date`
anchor kind added in the prior commit.

Co-Authored-By: Claude Sonnet 5 <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_014axryJBrRswYh2niA7WCUc

src/data/propers/common/vespers-versicle-holy-name-of-jesus.yml

@@ -0,0 +1,9 @@
+# Read from web/www/horas/Latin/Tempora/Nat2-0.txt's own [Versum 1] and
+# its English counterpart.
+id: vespers-versicle-holy-name-of-jesus
+text:
+  la: "V. Sit nomen Dómini benedíctum, allelúja.\nR. Ex hoc nunc et usque in sǽculum, allelúja."
+  en: "V. Blessed be the Name of the Lord, alleluia.\nR. From this time forth, and for evermore, alleluia."
+status:
+  la: verified
+  en: verified