Add Our Lady of the Snows (Aug 5) to the calendar

Previously excluded entirely under a stale "fixed BVM feasts aren't
modeled" note -- wrong: this app already models three other fixed BVM
feasts (assumption, immaculate-conception, nativity-bvm), and this one
has real, complete content too. Sancti/08-05.txt's untagged rank block
gives her Duplex Majus with real Nocturn 2/3 content (the
miraculous-snowfall founding legend of St. Mary Major); SanctiM/08-05.txt
confirms she's on the Monastic 1617 track too, reslicing the same
Lectio4-6.

Unlike the other three BVM feasts, she has no proper collect or
Benedictus antiphon of her own (her Rule says "ex C11" -- Common of
Feasts of the BVM) -- collect-c11.yml and
benedictus-antiphon-common-of-the-bvm.yml are real, reusable Common
templates, wired via collectCommon/benedictusCommon like any other
Common-only saint, not a private per-saint duplicate.

Live-checked via direct resolution: she wins outright on 2026-08-05 and
2027-08-05, with antiphon, collect, and Matins reading all resolving
verified. npm test (365 tests) and tsc --noEmit both pass.

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

src/data/propers/common/benedictus-antiphon-common-of-the-bvm.yml

@@ -0,0 +1,13 @@
+# Verified against the reference engine's own source data files:
+# web/www/horas/Latin/Commune/C11.txt's own [Ant 1] ("In Festis Beatae
+# Mariae Virginis" -- Common of Feasts of the BVM) and its English
+# counterpart. Reusable by any BVM feast keyed to `common: common-of-
+# the-bvm` (SaintRecord.benedictusCommon) that has no proper Benedictus
+# antiphon of its own -- e.g. our-lady-of-the-snows.yml.
+id: benedictus-antiphon-common-of-the-bvm
+text:
+  la: "Sancta María, * succúrre míseris, juva pusillánimes, réfove flébiles, ora pro pópulo, intérveni pro clero, intercéde pro devóto femíneo sexu: séntiant omnes tuum juvámen, quicúmque célebrant tuam sanctam festivitátem."
+  en: "O Holy Mary, * be thou an help to the helpless, a strength to the fearful, a comfort to the sorrowful; pray for the people, plead for the clergy, make intercession for all women vowed to God: may all that are keeping this thine holy Feast-day feel the might of thine assistance."
+status:
+  la: verified
+  en: verified

src/data/propers/common/collect-c11.yml

@@ -0,0 +1,24 @@
+# Verified against the reference engine's own source data files:
+# web/www/horas/Latin/Commune/C11.txt ("In Festis Beatae Mariae
+# Virginis" -- Common of Feasts of the BVM) and its English counterpart.
+# Unlike the collect-c*.yml martyr/confessor/virgin Commons, this
+# formula addresses "fámulis tuis" generically rather than naming the
+# saint (`beátæ N.`) -- no `{N}` placeholder, nothing to substitute; a
+# saint using this via SaintRecord.collectCommon still needs
+# `collectName` set (getDayCollect requires both), but its value is
+# never actually inserted into this particular template.
+id: collect-c11
+text:
+  la: |
+    Orémus.
+    Concéde nos fámulos tuos, quǽsumus, Dómine Deus, perpétua mentis et córporis sanitáte gaudére: et, gloriósa beátæ Maríæ semper Vírginis intercessióne, a præsénti liberári tristítia, et ætérna pérfrui lætítia.
+    Per Dóminum nostrum Jesum Christum, Fílium tuum: qui tecum vivit et regnat in unitáte Spíritus Sancti, Deus, per ómnia sǽcula sæculórum.
+    ℟. Amen.
+  en: |
+    Let us pray.
+    Grant, we beseech thee, O Lord God, unto all thy servants, that they may remain continually in the enjoyment of soundness both of mind and body, and by the glorious intercession of the Blessed Mary, always a Virgin, may be delivered from present sadness, and enter into the joy of thine eternal gladness.
+    Through Jesus Christ, thy Son our Lord, Who liveth and reigneth with thee, in the unity of the Holy Ghost, God, world without end.
+    ℟. Amen.
+status:
+  la: verified
+  en: verified