propers: add February's collect and antiphon text

Real collect text for the 6 February saints that have one, plus a real
antiphon for the 2 that have one of their own — same extraction method
as January (fully-rendered live-engine output, not the raw source files'
own shorthand endings).

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

src/data/propers/common/chair-of-st-peter-at-antioch-collect.yml

@@ -0,0 +1,19 @@
+# Verified against Divinum Officium (Monastic Tridentinum 1617) — read
+# directly from the reference engine's own real-date output (2029-02-22, a
+# year that date doesn't collide with a Sunday). Same convention as
+# data/propers/temporal/*-collect.yml.
+id: chair-of-st-peter-at-antioch-collect
+text:
+  la: |
+    Orémus.
+    Deus, qui beáto Petro Apóstolo tuo, collátis clávibus regni cæléstis, ligándi atque solvéndi pontifícium tradidísti: concéde; ut, intercessiónis ejus auxílio, a peccatórum nostrórum néxibus liberémur:
+    Qui vivis et regnas cum Deo Patre, in unitáte Spíritus Sancti, Deus, per ómnia sǽcula sæculórum.
+    ℟. Amen.
+  en: |
+    Let us pray.
+    O God, Who hast given unto thy Blessed Apostle Peter the keys of the kingdom of heaven, and the power to bind and to loose, loose us, we beseech thee, at his mighty intercession, from all the bands of our sins.
+    Who livest and reignest with God the Father in the unity of the Holy Spirit, God, world without end.
+    ℟. Amen.
+status:
+  la: verified
+  en: verified