Add September sanctoral content: 10 saints/feasts

Continues the full-year sanctoral import: St. Stephen of Hungary, St.
Pius X, St. Lawrence Justinian, Ss. Protus and Hyacinth, the Holy Name
of Mary, the Seven Sorrows of the BVM (Duplex II Classis, own full
proper content except Nocturn 2, a real cross-reference to Passion
Friday's own temporal content), the Impression of the Stigmata of St.
Francis, St. Joseph of Cupertino, Our Lady of Ransom, and St.
Wenceslaus.

Ss. Protus and Hyacinth (Sep 11) were previously excluded under a
stale "real secondary saint blocked by the Nativity's own octave, same
as St. Clare in August" note -- wrong, same class of error already
corrected for St. Tiburtius/Susanna in August: the octave-window
exclusion was never a real rule. Sep 15 (day 8 of the Nativity's own
octave) is now also the Seven Sorrows' own fixed day (Duplex II
Classis), which wins outright with the octave still commemorated
alongside her -- updated september-sanctoral.test.ts's own "excluded
secondary saints" case accordingly, splitting it into the still-valid
Sep 9 (Gorgonius) half and a new Sep 15 case reflecting the real
winner.

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

src/data/calendar/sanctoral-calendar.yml

@@ -281,10 +281,16 @@ days:
   "08-31": [st-raymond-nonnatus]
   # September — 9/12 of the pre-1955 pull. Same octave-gap exclusions as
   # August, this time around the Nativity of the BVM's own Sep 8-15
-  # octave: Ss. Gorgonius (Sep 9), Proti and Hyacinthus (Sep 11), and
-  # Nicomedes (Sep 15, the octave's own final day) are real named
-  # secondaries excluded for the same reason St. Clare was in August.
-  # St. Hadrian (Sep 8) is the one exception -- he's blocked by the
+  # octave: Ss. Gorgonius (Sep 9) and Nicomedes (Sep 15, the octave's own
+  # final day, also now the Seven Sorrows of the BVM's own fixed day)
+  # are real named secondaries still excluded for the same reason St.
+  # Clare was in August. Ss. Protus and Hyacinth (Sep 11) were also
+  # excluded here at first under that same reasoning -- wrong, corrected
+  # 2026-08 alongside the rest of the full-year sanctoral import (see
+  # ss-protus-and-hyacinth.yml): the octave-window exclusion was never a
+  # real rule, just an earlier gatekeeping habit this app has since moved
+  # away from (see vu-feedback-import-available-content memory). St.
+  # Hadrian (Sep 8) is the one exception -- he's blocked by the
   # Nativity's own day, not its octave, and that day IS already a mapped
   # sanctoral entry, so the ordinary collision engine handles him
   # correctly. The Exaltation of the Holy Cross (Sep 14) was also
@@ -311,17 +317,27 @@ days:
   # simplification (explicit user decision, 2026-08), not an oversight --
   # see st-michael.yml.
   "09-01": [st-giles, ss-twelve-brothers]
+  "09-02": [st-stephen-of-hungary]
+  "09-03": [st-pius-x]
+  "09-05": [st-lawrence-justinian]
   "09-08": [nativity-bvm, st-hadrian]
   "09-10": [st-nicholas-of-tolentino]
+  "09-11": [ss-protus-and-hyacinth]
+  "09-12": [holy-name-of-mary]
   "09-14": [exaltation-of-the-holy-cross]
+  "09-15": [seven-sorrows-of-the-bvm]
   "09-16": [ss-cornelius-and-cyprian, ss-euphemia-lucia-and-geminianus]
+  "09-17": [stigmata-of-st-francis]
+  "09-18": [st-joseph-of-cupertino]
   "09-19": [st-januarius]
   "09-20": [vigil-of-st-matthew]
   "09-21": [st-matthew]
   "09-22": [ss-maurice-and-companions]
   "09-23": [st-linus, st-thecla]
+  "09-24": [our-lady-of-ransom]
   "09-26": [ss-cyprian-and-justina]
   "09-27": [ss-cosmas-and-damian]
+  "09-28": [st-wenceslaus]
   "09-29": [st-michael]
   "09-30": [st-jerome]
   # October — 10/12 of the pre-1955 pull. Three monastic-calendar-specific