Relocate Immaculate Heart of Mary off Aug 22 to Easter+69

Fixed Aug 22 collided outright with the Assumption's own octave-closing
day (both this project's blended calendar tracks are kept deliberately,
so one shouldn't permanently suppress the other). Moved IHM to the
Saturday after the Feast of the Sacred Heart -- its real diocesan date
from 1914 until Pius XII's 1944 fixed-date decree, and also the date the
1969 reform returned to.

Required real new mechanism, not just a data move: a new bespoke
calendar/index.ts override (applyImmaculateHeart, following the existing
applyMarianSaturday/applyChristTheKing precedent), a move from the
sanctoral saints store to the temporal-feasts store (different propers
lookup entirely), and a real bug fix in matins.ts's nocturnReadingIds,
which only ever picked up a *sanctoral* winner's own reading file.

Co-Authored-By: Claude Sonnet 5 <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_01VZSAgRi4QE4XRTqVto93zA

src/data/propers/temporal/immaculate-heart-of-mary-benedictus-antiphon.yml

@@ -0,0 +1,14 @@
+# Read directly from web/www/horas/Latin/Sancti/08-22.txt's own
+# [Ant 1] and its English counterpart -- a real, proper antiphon of
+# this feast, not a Common substitution. Duplicated as both Benedictus
+# and Magnificat antiphon (see the -magnificat- sibling file): the
+# source only carries this single [Ant 1], and the temporal propers
+# store keys the two separately, unlike the sanctoral store's single
+# shared `${propers}-antiphon`.
+id: immaculate-heart-of-mary-benedictus-antiphon
+text:
+  la: "Exsultávit cor meum * in Dómino, et exaltátum est cornu meum in Deo meo, quia lætáta sum in salutári tuo."
+  en: "My heart hath rejoiced in the Lord, * and my horn is exalted in my God: because I have joyed in thy salvation."
+status:
+  la: verified
+  en: verified

src/data/propers/temporal/immaculate-heart-of-mary-collect.yml

@@ -0,0 +1,25 @@
+# Read directly from web/www/horas/Latin/Sancti/08-22.txt's own
+# [Oratio] and its English counterpart.
+id: immaculate-heart-of-mary-collect
+text:
+  la: |
+    Orémus.
+    Omnípotens sempitérne Deus, qui in Corde beátæ Maríæ Vírginis dignum
+    Spíritus Sancti habitáculum præparásti: concéde propítius; ut ejúsdem
+    immaculáti Cordis festivitátem devóta mente recoléntes, secúndum Cor tuum
+    vívere valeámus.
+    Per Dóminum ejúsdem Fílii tui: qui tecum vivit et regnat in unitáte Spíritus
+    Sancti, Deus, per ómnia sǽcula sæculórum.
+    ℟. Amen.
+  en: |
+    Let us pray.
+    Almighty everlasting God, who hast prepared in the heart of Blessed Virgin
+    Mary a worthy dwelling of the Holy Ghost, grant favourably to us that we
+    may keep the feast of the same Immaculate Heart devoutly, and may be able
+    to live according to thy heart.
+    Through the same 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

src/data/propers/temporal/immaculate-heart-of-mary-magnificat-antiphon.yml

@@ -0,0 +1,14 @@
+# Read directly from web/www/horas/Latin/Sancti/08-22.txt's own
+# [Ant 1] and its English counterpart -- a real, proper antiphon of
+# this feast, not a Common substitution. Duplicated as both Benedictus
+# and Magnificat antiphon (see the -benedictus- sibling file): the
+# source only carries this single [Ant 1], and the temporal propers
+# store keys the two separately, unlike the sanctoral store's single
+# shared `${propers}-antiphon`.
+id: immaculate-heart-of-mary-magnificat-antiphon
+text:
+  la: "Exsultávit cor meum * in Dómino, et exaltátum est cornu meum in Deo meo, quia lætáta sum in salutári tuo."
+  en: "My heart hath rejoiced in the Lord, * and my horn is exalted in my God: because I have joyed in thy salvation."
+status:
+  la: verified
+  en: verified