Fix stale St. Damasus header comment on octave precedence

Claimed Semiduplex wins outright over the Advent feria with the feria
commemorated in return -- true when written, but no longer true after
the later octave-wins-class rework. Dec 11 falls inside the Immaculate
Conception octave, whose elevated wins:duplex threshold now outranks a
plain Semiduplex, so Damasus is actually demoted to a commemoration
and the Advent feria keeps the day. No behavior change, found and
confirmed live while authoring St. Juan Diego's neighboring entry.

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

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

@@ -1,7 +1,12 @@
 # Verified against Divinum Officium (Monastic Tridentinum 1617), live
 # kalendar check (2025-12-11) -- an ordinary Advent feria
-# (privileged-feria-minor), Semiduplex wins outright, feria commemorated
-# in return. Own proper collect (Latin only -- see
+# (privileged-feria-minor), where a plain Semiduplex would normally win
+# outright. Superseded by the later octave-wins-class rework (see
+# st-juan-diego.yml, 2026-08): Dec 11 falls within the Immaculate
+# Conception's octave, whose elevated `wins: duplex` threshold now
+# outranks this Semiduplex, so he's actually demoted to a commemoration
+# and the Advent feria keeps the day (live-reconfirmed 2026-12-11 via
+# resolveDay). Own proper collect (Latin only -- see
 # propers/common/st-damasus-collect.yml for the missing-English note), no
 # unique antiphon of his own.
 id: st-damasus