Strengthen the Assumption's octave against a demoted St. John Eudes

Demote St. John Eudes (Aug 19) from Duplex to Semiduplex -- too minor
a confessor to keep outranking the Assumption's octave. To make that
demotion actually cede the day, raise the Assumption's octave to
`wins: duplex` (same pattern already used by Pentecost's octave), so an
ordinary-day tie no longer automatically favors the occurring saint.

Promote St. Thomas of Canterbury (Dec 29) to Duplex so he keeps
winning against the Christmas octave stack now that ordinary-day ties
are no longer a given.

Also add a closing-day tie-break to octave-vs-octave precedence
(pickWinningOctave): when two active octaves tie in rank, the one on
its own closing day now wins the label contest, ahead of the existing
"more recently started" tie-break. Needed because Assumption's day 3
and St. Lawrence's own closing day (Aug 17) now tie at Duplex, and the
closing day should still govern that date's label.

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

src/calendar/octaves.ts

@@ -115,11 +115,19 @@ export function strictestThreshold(octaves: ActiveOctave[]): FeastClass {
  *
  * - Highest effective rank (`wins`, already elevated on either octave's
  *   own closing day) wins outright.
- * - Tied rank: the more recently *started* octave wins (smaller
- *   `dayNumber` today) — the reasoning given was that day 1 of a newly
- *   started octave needs to be fully present, which is the whole point
- *   of it starting; the older octave that's already been running is
- *   commemorated instead, same as any octave that loses this comparison.
+ * - Tied rank, one of them on its own closing day: the closing day wins
+ *   — its "in Octava" day is the octave's own culminating day, so it
+ *   takes precedence over an ordinary day of an equally-ranked octave
+ *   even if that other octave started more recently (2026-08 user
+ *   instruction, concrete case: Aug 17, St. Lawrence's own closing day,
+ *   vs. the Assumption's ordinary day 3, both `duplex` once Assumption's
+ *   octave was strengthened — Lawrence's closing day wins).
+ * - Tied rank, neither (or both) on their own closing day: the more
+ *   recently *started* octave wins (smaller `dayNumber` today) — the
+ *   reasoning given was that day 1 of a newly started octave needs to be
+ *   fully present, which is the whole point of it starting; the older
+ *   octave that's already been running is commemorated instead, same as
+ *   any octave that loses this comparison.
  *
  * Undefined when no octave is active at all. Every other active octave
  * still gets commemorated regardless of which one wins here — this
@@ -187,6 +195,9 @@ export function pickWinningOctave(active: ActiveOctave[]): ActiveOctave | undefi
     if (rankCmp < 0) {
       return best;
     }
+    if (candidate.isClosingDay !== best.isClosingDay) {
+      return candidate.isClosingDay ? candidate : best;
+    }
     return candidate.dayNumber < best.dayNumber ? candidate : best;
   }, undefined);
 }

src/data/calendar/saints/assumption.yml

@@ -10,5 +10,16 @@ rank: duplex-1-classis
 common: common-of-the-bvm
 propers: "assumption"
 # Has a real octave (Aug 15-22) -- see calendar/types.ts's OctaveConfig.
+# Strengthened to `wins: duplex` (2026-08 user decision), same pattern
+# as pentecost-sunday.yml's own override -- a Semiduplex saint no
+# longer just ties (and, by the ordinary-day tie rule, wins) an
+# ordinary octave day here; it loses outright to the octave instead.
+# Concrete motivation: st-john-eudes.yml's demotion to Semiduplex only
+# actually cedes Aug 19 to the octave because of this. Side effect
+# accepted by the user: st-damasus.yml (Dec 11, Immaculate Conception's
+# octave) and st-nicholas-of-tolentino.yml (Sep 10, Nativity of the
+# BVM's octave) are unrelated octaves not touched by this change, so
+# they're unaffected -- this only strengthens Assumption's own octave.
 octave:
   enabled: true
+  wins: duplex

src/data/calendar/saints/st-john-eudes.yml

@@ -4,9 +4,16 @@
 # No [Ant 1] of his own -- benedictusCommon/minorHoursCommon fall back
 # to the plain Common of a Confessor. No Lectio7-9 in his own file --
 # defers to the Common's own Nocturn 3, not transcribed here.
+#
+# Deliberately demoted from the reference engine's own Duplex to
+# Semiduplex (2026-08 user decision) -- a minor confessor of no
+# particular standing shouldn't outrank the Assumption's own octave,
+# now strengthened to `wins: duplex` (see assumption.yml) specifically
+# so this demotion actually takes effect on his day (Aug 19, the
+# octave's 5th day) instead of merely tying and still winning.
 id: st-john-eudes
 name: "St. John Eudes, Confessor"
-rank: duplex
+rank: semiduplex
 common: common-of-a-confessor
 propers: "st-john-eudes"
 benedictusCommon: common-of-a-confessor

src/data/calendar/saints/st-thomas-becket.yml

@@ -6,9 +6,15 @@
 # `privileged-feria` model would have wrongly forbidden). Octave day
 # commemorated in return. Own proper collect, no unique antiphon of his
 # own.
+#
+# Deliberately promoted from the reference engine's own Semiduplex to
+# Duplex (2026-08 user decision, made alongside assumption.yml's octave
+# strengthening to `wins: duplex`) -- purely to keep him winning Dec 29
+# outright once the common octave-vs-saint default is no longer
+# uniformly Semiduplex everywhere; not a reference-engine finding.
 id: st-thomas-becket
 name: "St. Thomas of Canterbury, Bishop and Martyr"
-rank: semiduplex
+rank: duplex
 common: common-of-a-martyr-bishop
 propers: "st-thomas-becket"
 # P/T/S/N: no [Ant Prima]/etc of its own in the source (12-29o.txt) --

tests/calendar/christmas-octave-sunday.test.ts

@@ -66,7 +66,7 @@ describe('applyChristmasOctaveSunday', () => {
     expect(dec30.commemorations.some((c) => c.kind === 'octave' && c.id === 'holy-innocents')).toBe(false);
   });
 
-  it('Sunday on Dec 29 (St. Thomas Becket, only Semiduplex): still fully displaced to Dec 30, same as the Duplex-II-classis saints -- rank never matters for this rule', () => {
+  it('Sunday on Dec 29 (St. Thomas Becket): still fully displaced to Dec 30, same as the Duplex-II-classis saints -- rank never matters for this rule', () => {
     const sunday = resolveDay('2024-12-29');
     expect(sunday.winner).toEqual({ kind: 'temporal', id: 'christmas-octave-sunday' });
 
@@ -75,7 +75,7 @@ describe('applyChristmasOctaveSunday', () => {
       kind: 'sanctoral',
       id: 'st-thomas-becket',
       name: 'St. Thomas of Canterbury, Bishop and Martyr',
-      rank: 'semiduplex',
+      rank: 'duplex',
     });
   });
 
@@ -105,7 +105,7 @@ describe('applyChristmasOctaveSunday', () => {
       kind: 'sanctoral',
       id: 'st-thomas-becket',
       name: 'St. Thomas of Canterbury, Bishop and Martyr',
-      rank: 'semiduplex',
+      rank: 'duplex',
     });
   });
 

tests/calendar/day-label.test.ts

@@ -222,7 +222,7 @@ describe('getDayLabel — active octave', () => {
     expect(getDayLabel(day).en).toBe('Friday in Christmastide (Feria)');
   });
 
-  it("picks the higher-ranked of two genuinely overlapping octaves for the label -- St. Lawrence's own elevated closing day (Aug 17) over the Assumption's ordinary day 3, even though the Assumption's octave started later and the Assumption is the higher-ranked feast overall -- with St. Hyacinth (Duplex, tied with Lawrence's own elevated rank) commemorated rather than winning outright", () => {
+  it("picks St. Lawrence's own elevated closing day (Aug 17) over the Assumption's ordinary day 3, both duplex now that Assumption's octave is strengthened, via the closing-day tie-break -- with St. Hyacinth (Duplex, tied with Lawrence's own elevated rank) commemorated rather than winning outright", () => {
     // Live-verified against the reference engine directly (Monastic
     // Tridentinum 1617, command=prayMatutinum): Aug 17 is "In Octava S.
     // Laurentii Martyris ~ Duplex" -- Lawrence's own elevated closing day
@@ -232,12 +232,16 @@ describe('getDayLabel — active octave', () => {
     // closing day favors the octave (calendar/index.ts's applyOctaves),
     // unlike an ordinary mid-octave day's tie, which still favors an
     // occurring saint (see octaves.test.ts and the December/September
-    // sanctoral tests for those counterexamples). The Assumption's own
-    // day 3 (semiduplex, genuinely active but outranked by Lawrence's
-    // elevated duplex) still gets named, not dropped, alongside it -- with
-    // its own full "Nth Day within the Octave of X" phrasing, not a bare
-    // name: live-verified directly (Divino Afflatu 1954, where Aug 17's
-    // real winner is Hyacinth himself, not Lawrence's octave -- a
+    // sanctoral tests for those counterexamples). Octave-vs-octave, the
+    // same closing-day precedence applies (2026-08 user instruction,
+    // octaves.ts's pickWinningOctave): now that Assumption's own octave
+    // is strengthened to `wins: duplex`, its ordinary day 3 ties
+    // Lawrence's elevated closing day in rank, and the closing day wins
+    // that tie regardless of which octave started more recently. The
+    // Assumption's own day 3 still gets named, not dropped, alongside
+    // it -- with its own full "Nth Day within the Octave of X" phrasing,
+    // not a bare name: live-verified directly (Divino Afflatu 1954, where
+    // Aug 17's real winner is Hyacinth himself, not Lawrence's octave -- a
     // different rubric-track outcome, but the same commemoration phrasing
     // question): "Commemoratio: Tertia die infra Octavam S. Assumptionis
     // Beatæ Mariæ Virginis", not a bare "The Assumption of the Blessed
@@ -246,7 +250,7 @@ describe('getDayLabel — active octave', () => {
       'Octave of St. Lawrence, Martyr (Duplex) — 3rd Day within the Octave of The Assumption of the Blessed Virgin Mary — St. Hyacinth, Confessor',
     );
     expect(getDayLabel(resolveDay('2026-08-18')).en).toBe(
-      '4th Day within the Octave of The Assumption of the Blessed Virgin Mary (Semiduplex)',
+      '4th Day within the Octave of The Assumption of the Blessed Virgin Mary (Duplex)',
     );
   });
 
@@ -304,21 +308,19 @@ describe('getDayLabel — active octave', () => {
     expect(getDayLabel(day).en).not.toContain('Octave');
   });
 
-  it('a sanctoral winner that outright displaces the only active octave still shows that octave with its full "Nth Day within the Octave" phrasing, not a bare feast name -- and without a rank, since the octave is riding along under the winning duplex rather than asserting its own rank', () => {
-    // Live-verified against the reference engine (Divino Afflatu 1954,
-    // prayMatutinum): Aug 19 is "S. Joannis Eudes Confessoris ~ Duplex"
-    // with the commemoration read as plain "Quinta die infra Octavam S.
-    // Assumptionis Beatæ Mariæ Virginis" -- no rank at all -- i.e. the
-    // octave's real DO title even when it lost outright, not a bare "The
-    // Assumption of the Blessed Virgin Mary" (this app's previous
-    // behavior, reusing `otherActiveOctaveNames`'s plain-name formatting
-    // -- correct for a *secondary* octave alongside another *octave* that
-    // won, see the Aug 17/18 cases above, but wrong here where the octave
-    // itself is what's being commemorated against a winning saint) and
-    // also not `octaveLabel`'s own rank parenthetical (that belongs only
-    // to an octave day when it's the day's own primary winner).
+  it('the Assumption octave, strengthened to `wins: duplex`, now outright displaces St. John Eudes (demoted to Semiduplex) on its own ordinary day 5 -- he is merely commemorated, not won as the day\'s own winner', () => {
+    // 2026-08 user decision: St. John Eudes demoted from the reference
+    // engine's own Duplex to Semiduplex (see st-john-eudes.yml), and the
+    // Assumption's octave strengthened from the shared default
+    // (`wins: semiduplex`) to `wins: duplex` (see assumption.yml, same
+    // pattern as pentecost-sunday.yml's own override) specifically so an
+    // ordinary-day tie no longer favors the occurring saint here: Eudes's
+    // Semiduplex now loses outright to the octave's Duplex threshold,
+    // rather than tying and winning. This deliberately diverges from the
+    // reference engine's own live behavior (which has Eudes winning
+    // outright as Duplex) -- see CLAUDE.md's "not a reconstruction" note.
     expect(getDayLabel(resolveDay('2026-08-19')).en).toBe(
-      'St. John Eudes, Confessor (Duplex) — 5th Day within the Octave of The Assumption of the Blessed Virgin Mary',
+      '5th Day within the Octave of The Assumption of the Blessed Virgin Mary (Duplex) — St. John Eudes, Confessor',
     );
   });
 });

tests/calendar/december-sanctoral.test.ts

@@ -88,13 +88,13 @@ describe('December sanctoral pull (first pass, 12/12)', () => {
     ]);
   });
 
-  it('St. Thomas of Canterbury, only Semiduplex, still wins outright within the Christmas Octave -- the concrete case behind this month\'s temporal-category fix', () => {
+  it('St. Thomas of Canterbury still wins outright within the Christmas Octave -- the concrete case behind this month\'s temporal-category fix', () => {
     const day = resolveDay('2033-12-29');
     expect(day.winner).toEqual({
       kind: 'sanctoral',
       id: 'st-thomas-becket',
       name: 'St. Thomas of Canterbury, Bishop and Martyr',
-      rank: 'semiduplex',
+      rank: 'duplex',
     });
     // Thomas himself has no octave (user-confirmed, 2026-08), but by his
     // own day, Christmas + Stephen + John + Holy Innocents' octaves have
@@ -128,7 +128,7 @@ describe('December sanctoral pull (first pass, 12/12)', () => {
   });
 
   it('the Christmas Octave Sunday still keeps a lesser feast from winning, now via applyChristmasOctaveSunday specifically', () => {
-    // St. Thomas Becket (Semiduplex, Dec 29) transfers off the Sunday
+    // St. Thomas Becket (Dec 29) transfers off the Sunday
     // rather than winning it -- per calendar/index.ts's
     // applyChristmasOctaveSunday (see its own dedicated test file), which
     // now unconditionally wins the Sunday over *any* rank within Dec
@@ -144,7 +144,7 @@ describe('December sanctoral pull (first pass, 12/12)', () => {
       kind: 'sanctoral',
       id: 'st-thomas-becket',
       name: 'St. Thomas of Canterbury, Bishop and Martyr',
-      rank: 'semiduplex',
+      rank: 'duplex',
     });
   });
 

tests/calendar/octaves.test.ts

@@ -23,7 +23,7 @@ describe('activeOctavesFor', () => {
       {
         id: 'assumption',
         name: 'The Assumption of the Blessed Virgin Mary',
-        wins: 'semiduplex',
+        wins: 'duplex',
         dayNumber: 3,
         isClosingDay: false,
       },
@@ -60,7 +60,7 @@ describe('resolveActiveOctave / pickWinningOctave -- overlapping-octave preceden
     expect(resolveActiveOctave('2026-08-10')?.id).toBe('st-lawrence');
   });
 
-  it("St. Lawrence's own elevated closing day (duplex) outranks the Assumption's ordinary day 3 (semiduplex) on their one real overlap, Aug 17", () => {
+  it("St. Lawrence's own elevated closing day (duplex) wins the closing-day tie-break over the Assumption's ordinary day 3 (also duplex) on their one real overlap, Aug 17", () => {
     const winner = resolveActiveOctave('2026-08-17');
     expect(winner?.id).toBe('st-lawrence');
     expect(winner?.wins).toBe('duplex');