Add July sanctoral content: 11 saints/feasts, fix St. Leo II's wrong date

Continues the full-year sanctoral import: the Most Precious Blood of Our
Lord (Duplex I Classis, full proper office, elevated by Pius XI for the
1933 Redemption jubilee), the Visitation of the BVM (Duplex II Classis,
full proper office), St. Leo II, St. Anthony Mary Zaccaria, the Octave
Day of Ss. Peter and Paul (own real content, not a bare continuation),
Ss. Cyril and Methodius, St. Elizabeth of Portugal, St. Henry, Our Lady
of Mount Carmel, St. Vincent de Paul, and St. Ignatius of Loyola.

Also fixes a real pre-existing bug surfaced while authoring St. Leo II:
an earlier June sanctoral pull had mapped him to "06-28" (his own vita
text mentions his burial "upon the 28th day of June," but his actual
liturgical feast, per the reference engine's Sancti/07-03.txt, is July
3) with no saints/st-leo-ii.yml ever authored for it -- a wrong-date
stub, same class of artifact as the pre-existing St. Apollinaris
wrong-date bug already documented in july-sanctoral.test.ts. Removed
the stale June 28 entry now that he's correctly authored on July 3.

Two day-label tests pinned to Trinity-Sunday-relative dates that now
collide with new fixed feasts (Jul 6: Octave Day of Ss. Peter and Paul)
were moved to collision-free years/dates, and the July stub test
covering "pure octave-continuation days" was updated to a date (July 4)
that's still genuinely unmapped, since most of that range turned out to
have real content after all.

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

src/data/propers/common/most-precious-blood-collect.yml

@@ -0,0 +1,26 @@
+# Read directly from web/www/horas/Latin/Sancti/07-01.txt's own
+# [Oratio] and its English counterpart.
+id: most-precious-blood-collect
+text:
+  la: |
+    Orémus.
+    Omnípotens sempitérne Deus, qui unigénitum Fílium tuum mundi Redemptórem
+    constituísti, ac ejus Sánguine placári voluísti: concéde, quǽsumus, salútis
+    nostræ prétium solémni cultu ita venerári, atque a præséntis vitæ malis ejus
+    virtúte deféndi in terris; ut fructu perpétuo lætémur in cælis.
+    Per eúndem 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.
+    Almighty, eternal God, Who made thy only-begotten Son the Redeemer of the world,
+    and willed to be reconciled by His Blood, grant us, we beseech thee, so to worship
+    in this sacred rite the price of our salvation, and to be so protected by its power
+    against the evils of the present life on earth, that we may enjoy its everlasting
+    fruit in heaven.
+    Through the same 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