Finish the sanctoral commemoration bundle sweep (213/218 saints)

Follow-up to the earlier bulk pass. Sourced the remaining category
templates: BVM feasts (13, reused the already-verified BVM suffrage
versicle plus each feast's own antiphon), angels (4, versicle inferred
from a saint file's own "structural category" note), Confessor-Doctor/
-Pope (7, resolved to C4a/C5a/C4b -- each inheriting its base category's
Ant2/Versum2 unchanged, no new content needed), several confessors and
apostles-plural (2, reusing already-sourced category versicles), and 5
fully-proper feasts (All Saints x2, Finding of the Holy Cross, Most
Precious Blood, Transfiguration, Our Lady of Ransom) given their own
real Ant2/Versum2 straight from their Sancti files.

213 of ~218 real saints now covered. Only the 5 Vigils remain open --
no dedicated Commune template exists for that category in the reference
engine, and FeastClass 'vigil' rarely reaches the commemoration code
path anyway.

Co-Authored-By: Claude Sonnet 5 <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_01ME8QNPdEmHSbSx1r6VmDRG

src/data/propers/common/immaculate-conception-commemoration.yml

@@ -0,0 +1,22 @@
+# Own proper antiphon (immaculate-conception-antiphon.yml), paired with the standard BVM commemoration versicle already verified elsewhere in this app (propers/common/lauds-suffrage-bvm.yml -- 'V. Ora pro nobis sancta Dei Genitrix'). Collect is the saint's own real proper (immaculate-conception-collect.yml), unchanged.
+id: immaculate-conception-commemoration
+text:
+  la: |
+    Ant. Conceptiónem hodiérnam perpétuæ Vírginis Genitrícis Dei Maríæ solémniter celebrémus, qua celsitúdo throni procéssit, allelúja.
+    V. Ora pro nobis sancta Dei Génitrix.
+    R. Ut digni efficiámur promissiónibus Christi.
+    Orémus.
+    Deus, qui per immaculátam Vírginis Conceptiónem dignum Fílio tuo habitáculum præparásti: quǽsumus; ut qui ex morte ejúsdem Fílii tui prævísa, eam ab omni labe præservásti, nos quoque mundos ejus intercessióne ad te perveníre concédas.
+    Per Dóminum nostrum Jesum Christum, Fílium tuum: qui tecum vivit et regnat in unitáte Spíritus Sancti, Deus, per ómnia sǽcula sæculórum.
+    ℟. Amen.
+  en: |
+    Ant. Let us this day keep solemnly the Conception of Mary, Mother but still Maiden, a step toward the loftiness of her throne. Alleluia.
+    V. Pray for us, holy Mother of God.
+    R. That we may be made worthy of the promises of Christ.
+    Let us pray.
+    O God, by the Immaculate Conception of the Virgin, thou prepared a worthy habitation for thy Son; we beseech thee, that, as by the foreseen death of thy same Son thou preserved her from all stain of sin, so thou would grant us also, through her intercession, to come to thee with pure hearts.
+    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