Add 6 more February saints/feasts previously never added

Purification of the BVM (Feb 2), St. Andrew Corsini (Feb 4), St. John
of Matha (Feb 8), Apparition of the Immaculate BVM at Lourdes (Feb 11),
Ss. Seven Founders of the Servite Order (Feb 12), St. Gabriel of Our
Lady of Sorrows (Feb 27) -- all had real, complete Matins content in
the reference engine and no exclusion comment; simply never reached
during the earlier month-by-month sanctoral pulls. Continuing the same
sweep as January's St. Francis de Sales/St. Martina/St. John Bosco.

Test update (not a regression): St. Andrew Corsini transfers onto Feb 5
in years where Sexagesima falls on his own Feb 4, outranking St. Agatha
when it does -- february-sanctoral.test.ts's proof year for Agatha
moved from 2029 (now a collision year) to 2025 (clean).

npm test (365 tests) and tsc --noEmit both pass.

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

src/data/propers/common/ss-seven-founders-of-the-servite-order-collect.yml

@@ -0,0 +1,24 @@
+# Read directly from web/www/horas/Latin/Sancti/02-12.txt's own
+# [Oratio] and its English counterpart.
+id: ss-seven-founders-of-the-servite-order-collect
+text:
+  la: |
+    Orémus.
+    Dómine Jesu Christe, qui ad recoléndam memóriam dolórum sanctíssimæ Genetrícis tuæ,
+    per septem beátos Patres nova Servórum ejus família Ecclésiam tuam fecundásti: concéde
+    propítius; ita nos eórum consociári flétibus, ut perfruámur et gáudiis.
+    Qui vivis et regnas cum Deo Patre, in unitáte Spíritus Sancti, Deus, per ómnia sǽcula
+    sæculórum.
+    ℟. Amen.
+  en: |
+    Let us pray.
+    Lord Jesus Christ, who, that thou mightest recall to mind the woes of thy most holy
+    Mother, didst through the Seven blessed Fathers make thy Church herself the mother of a
+    new household of her servants, grant unto us in mercy that we may so share their tears
+    as to share their blessedness also.
+    Who livest and reignest with God the Father, in the unity of the Holy Ghost, God, world
+    without end.
+    ℟. Amen.
+status:
+  la: verified
+  en: verified