propers: add the temporal collects store, 52 Sunday collects

New data/propers/temporal/*.yml and propers/index.ts's getTemporalProper,
mirroring the existing common-propers store. Populated with all 52
distinct Sunday collects for the full liturgical year (Advent 1-4, the
Christmas-octave Sunday, Epiphany 1-6, Septuagesima-tide, Lent 1-4 +
Passion + Palm Sunday, the 8 Paschal-time Sundays through Pentecost, and
post-Pentecost 1-24), each verified against the real Monastic Tridentinum
1617 engine.

Keyed Pentecost/offset-based ("post-pentecost-N-collect"), not
Trinity-counted — that's a display choice for calendar/day-label.ts, kept
independent of this content's storage identity. 8 of the 52 needed to be
read directly from the reference engine's source files plus its standard
closing-formula macros, since a real saint outranks those particular
Sundays on every candidate year checked and a live date query would only
ever return the saint's own collect.

src/data/propers/temporal/post-pentecost-13-collect.yml

@@ -0,0 +1,21 @@
+# Verified against Divinum Officium (Monastic Tridentinum 1617) -- read
+# directly from the reference engine's own real-date output (not
+# reconstructed from memory). Keyed Pentecost/offset-based
+# ("post-pentecost-N") rather than Trinity-counted deliberately: this is
+# content storage, kept scheme-agnostic, independent of whatever counting
+# convention calendar/day-label.ts shows on screen for the same Sunday.
+id: post-pentecost-13-collect
+text:
+  la: |
+    Orémus.
+    Omnípotens sempitérne Deus, da nobis fídei, spei et caritátis augméntum: et, ut mereámur ássequi quod promíttis, fac nos amáre quod prǽcipis.
+    Per Dóminum nostrum Jesum Christum, Fílium tuum: qui tecum vivit et regnat in unitáte Spíritus Sancti, Deus, per ómnia sǽcula sæculórum.
+    R. Amen.
+  en: |
+    Let us pray.
+    Almighty and everlasting God, give unto us the increase of faith, hope, and charity, and that we may worthily obtain that which Thou dost promise, make us to love that which Thou dost command.
+    Through Jesus Christ, thy Son our Lord, Who liveth and reigneth with thee, in the unity of the Holy Ghost, God, world without end.
+    R. Amen.
+status:
+  la: verified
+  en: verified