Omit Lauds suffrages entirely during Advent/Christmastide/Passiontide and any active octave

Checked directly against Monastic Tridentinum 1617 (not just the
Tridentine 1906/1910 track the suffrage content itself comes from) --
this omission isn't a rubric-track-specific quirk, it holds under this
app's own primary source too:

- Advent, Christmastide, and Passiontide ferias: suffrages omitted
  entirely. Confirmed ordinary Lent (weeks 1-4, not Passiontide) is NOT
  excluded -- only the last two weeks are.
- Any day within an active octave: suffrages omitted entirely, however
  low that octave's own rank is -- confirmed against day 2/3 of St.
  Lawrence's own Semiduplex octave, well below the existing Duplex+
  threshold.

Today (within Lawrence's octave) was showing all five suffrages before
this fix; the real office has none but the Marian antiphon.

Still not modeled, flagged in TODO.md: Paschaltide's own substitution
(a single alleluia-form "Suffragium Paschale" replaces the whole set
during Eastertide, rather than the ordinary set showing or being
omitted) -- a separate, larger feature.

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

src/hours/lauds.ts

@@ -1,6 +1,6 @@
 import type { HourDefinition, HourPart, ResolvedOrdo, ResolvedPart, ResolvedText } from './types';
 import type { LiturgicalDay, Weekday } from '../calendar/types';
-import { resolveDay, isAtLeast, isSundayOrFeast } from '../calendar';
+import { resolveDay, isAtLeast, isSundayOrFeast, activeOctavesFor } from '../calendar';
 import { getDayLabel } from '../calendar/day-label';
 import { getTemporalFeastRecord } from '../calendar/temporal-feasts';
 import { getPsalmVerses } from '../psalter';
@@ -244,7 +244,19 @@ function resolvePart(part: HourPart, day: LiturgicalDay): ResolvedPart[] {
       // "Suffragium{omittitur}" — the whole set drops, same as any other
       // Double-or-higher day.
       const isChristTheKing = day.winner.kind === 'temporal' && day.winner.id === 'christ-the-king';
-      if (part.omitOnDouble && (isDoubleOrHigher(day.winner) || isChristTheKing)) {
+      // Confirmed live against Monastic Tridentinum 1617 directly (this
+      // isn't a Tridentine-1906-only quirk -- the same exclusions hold
+      // under the app's own primary rubric track): suffrages are omitted
+      // *entirely* during Advent, Christmastide, and Passiontide (not all
+      // of Lent -- ordinary Lent ferias still get them, checked directly
+      // against 2026-02-20; only the last two weeks), and on any day
+      // within an active octave, however low that octave's own rank is
+      // -- checked directly against day 3 of St. Lawrence's own
+      // (Semiduplex) octave, which still omits them despite being well
+      // below the Duplex+ rank threshold below.
+      const isSeasonallyExcluded = day.season === 'advent' || day.season === 'christmastide' || day.season === 'passiontide';
+      const isWithinAnOctave = activeOctavesFor(day.date).length > 0;
+      if (part.omitOnDouble && (isDoubleOrHigher(day.winner) || isChristTheKing || isSeasonallyExcluded || isWithinAnOctave)) {
         return [];
       }
       // "Of the Holy Cross" is the real *ferial*-office suffrage, sourced