propers: add October's collect text

7 collects. Also moves two pre-existing tests' dates off Oct 4-5, which
now carry real sanctoral content (St. Francis, Ss. Placid and
Companions) that changes their governing behavior -- same class of
collision as previous months.

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

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

@@ -0,0 +1,17 @@
+# Verified against Divinum Officium (Monastic Tridentinum 1617) — read
+# directly from the reference engine's own real-date output (2025-10-18).
+id: st-luke-collect
+text:
+  la: |
+    Orémus.
+    Intervéniat pro nobis, quǽsumus, Dómine, sanctus tuus Lucas Evangelísta: qui crucis mortificatiónem júgiter in suo córpore, pro tui nóminis honóre, portávit.
+    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 Lord, we beseech thee, that Luke, thy holy Evangelist, who for the honor of thy name bore continually in his body the suffering of the cross, may intercede in our behalf.
+    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