propers: add August's collect and antiphon text

11 collects, 4 antiphons -- including backfilling the three pre-existing
August entries (Lawrence, Assumption, Augustine) now that the pulling
methodology exists. Also updates three pre-existing tests whose dates
collided with this month's new real content: the vigil-of-St.-Lawrence
backward-transfer case now runs into a real feast at its landing day
instead of an empty one (confirmed correct against the live reference
engine, including the surviving commemoration on the impeded Sunday
itself), and two other tests moved off Aug 9/10 to dates unaffected by
the new data.

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

src/data/propers/common/st-bartholomew-collect.yml

@@ -0,0 +1,17 @@
+# Verified against Divinum Officium (Monastic Tridentinum 1617) — read
+# directly from the reference engine's own real-date output (2026-08-24).
+id: st-bartholomew-collect
+text:
+  la: |
+    Orémus.
+    Omnípotens sempitérne Deus, qui hujus diéi venerándam sanctámque lætítiam in beáti Apóstoli tui Bartholomǽi festivitáte tribuísti: da Ecclésiæ tuæ, quǽsumus; et amáre quod crédidit, et prædicáre quod dócuit.
+    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.
+    O Almighty and everlasting God, Who hast given unto us this day to be a day worshipful, and holy, and joyful, because of the Feast of thy blessed Apostle Bartholomew, grant, we beseech thee, unto thy Church both to love that which he believed, and to preach that which he taught.
+    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