calendar: document the Sep 29 St. Michael decision

Records the explicit choice to keep the pre-existing Sep 29 mapping as a
deliberate simplification rather than removing it, per user decision.

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

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

@@ -2,6 +2,14 @@
 # untagged/default [Rank] block — that file's own "(sed rubrica tridentina)"
 # alternate gives Duplex II classis instead; the plain default is used here
 # for consistency with how every other saint file in this set was read).
+# FLAGGED (September pull): a live kalendar query against this pull's
+# actual target track ("Monastic Tridentinum 1617") shows nothing at all
+# on Sep 29 across 6 different years, and this file's own [Rank] block has
+# no untagged/default entry for Sep 29 specifically -- only rubric-tagged
+# alternates. The already-verified May 8 Apparition of St. Michael (see
+# apparition-of-st-michael.yml) may be this tradition's only real
+# Michaelmas. Kept mapped to Sep 29 anyway as a deliberate, informed
+# simplification (explicit user decision, 2026-08), not an oversight.
 id: st-michael
 name: "St. Michael the Archangel"
 rank: duplex-1-classis

src/data/calendar/sanctoral-calendar.yml

@@ -207,17 +207,19 @@ days:
   # the latter is added outright, present in neither the base table nor
   # (for Nicholas) its own octave slot.
   #
-  # FLAGGED FOR REVIEW: the pre-existing "09-29": [st-michael] mapping
-  # below (added before this pull initiative, sourced from the raw
-  # Sancti/09-29.txt file directly rather than a live query) does not
-  # appear to hold in this pull's actual target track -- a live kalendar
-  # check across 6 different years (2025-2030) shows nothing at all on
-  # Sep 29 in "Monastic Tridentinum 1617" (not even a commemoration),
-  # and that file's own [Rank] block has no untagged/default entry for
-  # this date, only rubric-tagged alternates (tridentina, cisterciensis).
-  # The already-correctly-pulled May 8 Apparition of St. Michael (see
+  # The pre-existing "09-29": [st-michael] mapping below (added before
+  # this pull initiative, sourced from the raw Sancti/09-29.txt file
+  # directly rather than a live query) does not appear to hold in this
+  # pull's actual target track -- a live kalendar check across 6 different
+  # years (2025-2030) shows nothing at all on Sep 29 in "Monastic
+  # Tridentinum 1617" (not even a commemoration), and that file's own
+  # [Rank] block has no untagged/default entry for this date, only
+  # rubric-tagged alternates (tridentina, cisterciensis). The already-
+  # correctly-pulled May 8 Apparition of St. Michael (see
   # apparition-of-st-michael.yml) may be this tradition's only real
-  # Michaelmas. Left as-is pending a decision -- see this month's summary.
+  # Michaelmas. Kept mapped here anyway as a deliberate, informed
+  # simplification (explicit user decision, 2026-08), not an oversight --
+  # see st-michael.yml.
   "09-01": [st-giles, ss-twelve-brothers]
   "09-08": [nativity-bvm, st-hadrian]
   "09-10": [st-nicholas-of-tolentino]