Add Common-of-an-Angel Lauds/Vespers psalmody category

No dedicated numbered Common exists for Angels in the reference engine;
St. Michael's own rule says plain "Psalmi Dominica" with his own proper
antiphons, which Guardian Angels (no proper of her own) reuses
byte-for-byte at both hours. Authored as a reusable category so any
future proper-less Angel addition benefits automatically.

Co-Authored-By: Claude Sonnet 5 <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_01AHXJAWVAabCKX1JgmDh4Rn

src/data/hours/lauds-psalmody-overrides/categories/common-of-an-angel.yml

@@ -0,0 +1,41 @@
+# Generic Common-of-an-Angel Lauds psalmody. Unlike every other Common
+# here, there is no dedicated numbered "Cx" Common file for Angels in the
+# Monastic reference engine at all (checked the full CommuneM directory
+# listing) -- St. Michael's own SanctiM rule instead says plain "Psalmi
+# Dominica" (Sunday's own psalmody) and carries his own proper antiphons
+# directly. Live-verified (2026-08-28) that Guardian Angels (Oct 2, no
+# proper text of her own) reuses Michael's own antiphons byte-for-byte at
+# both Lauds and Vespers -- i.e. Michael's proper *is* the de facto
+# generic Angel scheme any other Angel-Common saint without proper text
+# of their own falls back to. St. Gabriel and St. Raphael each have their
+# own genuinely distinct proper antiphons (not this generic scheme, and
+# not each other's) -- not modeled here since a per-feast Lauds override
+# would be the correct home for those, not this category.
+#
+# Psalm numbers here (92, 99, 62, Canticum Trium Puerorum) are still the
+# usual fixed Duplex-majus+ set, confirmed against Michael's own live
+# Lauds -- only Vespers substitutes "Psalmi Dominica" (109-112) instead,
+# see the Vespers category file's own note.
+id: common-of-an-angel
+groups:
+  - psalms: [92]
+    antiphon:
+      la: "Stetit Angelus * iuxta aram templi, habens thuríbulum áureum in manu sua."
+      en: "An Angel stood at the Altar * of the Temple, having a golden censer in his hand."
+  - psalms: [99]
+    antiphon:
+      la: "Dum præliarétur * Míchaël Archángelus cum dracóne, audíta est vox dicéntium: Salus Deo nostro, allelúia."
+      en: "While as the Archangel Michael fought against the dragon, * I heard voices saying: Salvation unto our God. Alleluia."
+  - psalms: [62]
+    antiphon:
+      la: "Archángele Míchaël, * constítui te príncipem super omnes ánimas suscipiéndas."
+      en: "Michael Mine Archangel, * I have appointed thee for a prince over the ingathering of souls."
+canticle:
+  id: canticum-trium-puerorum
+  antiphon:
+    la: "Angeli Dómini, * Dóminum benedícite in ætérnum."
+    en: "O ye Angels of the Lord, * bless ye the Lord always."
+laudate:
+  antiphon:
+    la: "Angeli, Archángeli, * Throni et Dominatiónes, Principátus et Potestátes, Virtútes cælórum, laudáte Dóminum de cælis, allelúia."
+    en: "O ye Angels and Archangels, * O ye Thrones and Dominions, O ye Principalities and Powers, O ye mighty Ones of heaven, praise ye the Lord from the heavens. Alleluia."