Add St. Francis de Sales, St. Martina, St. John Bosco (Jan 29-31)

Per direct instruction to import all available sanctoral content
regardless of rubric-era markers: these three had real, complete Matins
content in the reference engine and were simply never added during the
earlier month-by-month sanctoral pulls (no exclusion comment, no
placeholder -- just never reached). First of a broader sweep across the
whole calendar.

New shared Common template: benedictus-antiphon-common-of-a-confessor.yml
(Commune/C5's own Ant 1) -- the first common-of-a-confessor saint that
needed one; st-alexius.yml (the only prior user of this category) had
used a Cistercian-specific alternate instead.

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

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

src/data/calendar/sanctoral-calendar.yml

@@ -36,6 +36,9 @@ days:
   "01-26": [st-polycarp]
   "01-27": [st-john-chrysostom]
   "01-28": [st-agnes-secunda]
+  "01-29": [st-francis-de-sales]
+  "01-30": [st-martina]
+  "01-31": [st-john-bosco]
   # February — 2/12 of the pre-1955 pull. Same exclusions as January (pure
   # octave/temporal continuations, fixed Lord/BVM feasts: Purification
   # Feb 2), plus two new ones found this month: the generic, non-saint