Add nameLa mechanism for bilingual header, proof set of 11 feasts + St. Lawrence

Threads an optional nameLa field through SanctoralIdentity/SaintRecord/
TemporalFeastRecord/ActiveOctave so day-label.ts can render real Latin
proper names instead of always falling back to English. Authors the
proof set: all 11 named temporal feasts plus St. Lawrence (chosen to
exercise the octave-headline and octave-commemoration code paths too).

Co-Authored-By: Claude Sonnet 5 <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_01EwsZQMjALCvy7u9tFDWmuQ

src/data/calendar/temporal-feasts/pentecost-sunday.yml

@@ -10,6 +10,9 @@
 # before it gets the chance.
 id: pentecost-sunday
 name: "Pentecost"
+# Reference engine's own [Officium] title, Tempora/Pent00-0.txt — already
+# a nominative noun phrase, no adaptation needed.
+nameLa: "Dominica Pentecostes"
 rank: duplex-1-classis
 octave:
   enabled: true