calendar: pull October's sanctoral calendar (pre-1955 pull, 10/12)

16 saints (14 real winners + 2 stubs). Three monastic-calendar-specific
finds this month: Ss. Placid and Companions (Oct 5, St. Benedict's own
disciple, Duplex II. classis -- absent from the base Tridentine table
entirely), St. Justina (Oct 7, reassigns what the base table gives to
St. Marcus, Pope), and St. Gall (Oct 16, founder of St. Gallen, also
absent from the base table). No octave-gap exclusions this month.

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

src/data/calendar/saints/ss-ursula-and-companions.yml

@@ -0,0 +1,9 @@
+# Genuinely unwinnable stub (verified 2025-10-21, 2026-10-21) -- always
+# commemorated under St. Hilarion (see st-hilarion.yml), never wins
+# outright; both are fixed, non-movable dates, so this isn't an artifact
+# of the tested year. rank/propers unverified placeholders.
+id: ss-ursula-and-companions
+name: "Ss. Ursula and Companions, Virgins and Martyrs"
+rank: simplex
+common: common-of-several-martyrs
+propers: null