calendar: pull August's sanctoral calendar (pre-1955 pull, 8/12)

18 saints (14 real winners + 4 stubs), plus propers-slug updates for the
4 pre-existing August entries. Notable this month: several dates have a
real named secondary saint permanently subordinate to an unmodeled fixed
octave (Lawrence's own, the Assumption's) or the fixed Transfiguration --
excluded entirely rather than guessed at, since this app can't yet
represent the actual blocking primary (a known, deferred octave gap).
Most notable casualty: St. Clare (Aug 12).

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

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

@@ -2,8 +2,12 @@
 # untagged/default [Rank] block — that file's own "(sed rubrica 1930)"
 # alternate raises this to Duplex majus, but 1930 postdates the pre-1910
 # calendar this app targets, so the plain default is used instead.
+# Propers backfilled during the August pull (live kalendar/prayTertia
+# check, 2025-08-28) now that the collect-pulling methodology exists --
+# own proper collect, no unique antiphon of his own; wins outright over
+# the stub St. Hermes (see st-hermes.yml).
 id: st-augustine
 name: "St. Augustine of Hippo, Bishop, Confessor and Doctor of the Church"
 rank: duplex
 common: common-of-a-confessor-bishop
-propers: null
+propers: "st-augustine"