Add November sanctoral content (5 saints/feasts)

St. Charles Borromeo (11-04), the Octave Day of All Saints (11-08,
own real Cyprian/Augustine Nocturn 2-3 content, collect reused from
All Saints via cross-id propers), St. Albert the Great (11-15),
St. Gertrude (11-16), St. Felix of Valois (11-20). All Souls' Day
(11-02) deliberately skipped -- a Requiem office, not a normal
saint's office, a genuine mechanism gap.

Several new fixed-date Duplex+ saints displaced existing test
fixtures that had assumed particular dates were clean/ferial/
plain-Sunday: prime.test.ts's MONDAY constant, weekday.test.ts's
clean-Sunday case, and day-label.test.ts's post-Epiphany-overflow
and open-octave-day cases. Fixed by finding genuinely clean
alternate dates/years, never by weakening assertions.

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

src/data/calendar/saints/st-gertrude.yml

@@ -0,0 +1,11 @@
+# Read directly from the reference engine: untagged/default [Rank]
+# block of `web/www/horas/Latin/Sancti/11-16.txt` -- "Duplex;;3;;vide
+# C6a" (Commune Virginum tantum, i.e. not a martyr -- C6 is Virgin +
+# Martyr, C6a is Virgins only). Own real proper [Oratio] and own
+# Nocturn 2 content (Lectio4-6, one continuous vita). No [Lectio7] at
+# all in the source -- no own Nocturn 3.
+id: st-gertrude
+name: "St. Gertrude, Virgin"
+rank: duplex
+common: common-of-a-virgin
+propers: "st-gertrude"