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/assumption.yml

@@ -1,7 +1,11 @@
 # Verified against Divinum Officium (web/www/horas/Latin/Sancti/08-15.txt,
-# untagged/default [Rank] block).
+# untagged/default [Rank] block). Propers backfilled during the August
+# pull (live kalendar/prayTertia check, 2025-08-15) now that the
+# collect-pulling methodology exists -- own proper collect. Its own
+# [Ant 1] is itself a cross-reference (@Sancti/08-15t, a Tridentine-
+# specific block) rather than plain text, so left unpulled this pass.
 id: assumption
 name: "The Assumption of the Blessed Virgin Mary"
 rank: duplex-1-classis
 common: common-of-the-bvm
-propers: null
+propers: "assumption"