Widen seasonal hymn-doxology to cover Marian Saturday and the Assumption octave

getHymnDoxologyId now takes the whole LiturgicalDay (needed for a date-window
check) and checks a feast override for a temporal winner's id too, not just
sanctoral — matching Divinum Officium's own Common-of-the-BVM `Doxology=Nat`
rule, which is why Marian Saturdays get the Nativity doxology regardless of
season. Also ports the source's Aug 16-22 (Assumption octave) hardcoded
Nativity-doxology window, confirmed live not excluded for the Monastic/
Tridentine 1617 track.

Co-Authored-By: Claude Sonnet 5 <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_01AGjUyhUZJaSjiniEmnLdak

src/hours/hymn-doxology.ts

@@ -1,21 +1,55 @@
-import type { Season, DayWinner } from '../calendar/types';
-import { resolveSeasonalPropersId } from './seasonal-propers';
+import type { LiturgicalDay } from '../calendar/types';
+import { resolveOfficeWinner } from './resolve-common';
 import bySeasonData from '../data/hours/hymn-doxology-by-season.yml';
 import byFeastData from '../data/hours/hymn-doxology-by-feast.yml';
 
 const bySeason = bySeasonData as { bySeason: Record<string, string> };
 const byFeast = byFeastData as { byFeastId: Record<string, string> };
 
+const NAT_DOXOLOGY_ID = 'hymn-doxology-nat';
+
+/**
+ * Divinum Officium's own doxology() sub (specials/hymni.pl) hardcodes the
+ * Assumption's octave (Aug 16-22) to the Nativity doxology, regardless of
+ * season or which feast is winning that day — live-checked in the source,
+ * and *not* excluded for the Monastic/Tridentine 1617 track (unlike its
+ * Dec 9-15 companion rule for the Immaculate Conception's run-up, which the
+ * source explicitly excludes 1570/1617/1963/altovadensis from, so that one
+ * is deliberately NOT ported here). Checked directly by date, same pattern
+ * as marian-antiphon.ts's isCandlemasToHolyWednesday — this window doesn't
+ * line up with any `Season` value.
+ */
+function isAssumptionOctaveWindow(isoDate: string): boolean {
+  const [, monthStr, dayStr] = isoDate.split('-');
+  const month = Number(monthStr);
+  const day = Number(dayStr);
+  return month === 8 && day > 15 && day < 23;
+}
+
 /**
  * Resolves the common-propers id for a hymn's seasonal final doxology
  * stanza. The seasonal overrides are shared across every hymn (Divinum
  * Officium's own Doxologies.txt table is hymn-agnostic), but the per-annum
  * default is each hymn's own natural ending, so callers supply it.
+ *
+ * Precedence, matching hymni.pl's doxology() sub: (1) an explicit per-feast
+ * override — real Divinum Officium's `winner{Doxology}`/`Rule Doxology=`
+ * mechanism, e.g. the Common of the BVM's own `Doxology=Nat` rule, which is
+ * why Marian Saturdays (a `kind: 'temporal'` winner, not `'sanctoral'` —
+ * checked regardless of kind, unlike chapter-responsory's/opening-
+ * versicle's own byFeastId tables, since a temporal id and a sanctoral id
+ * never collide) get the Nativity doxology even outside Christmastide; (2)
+ * the Assumption-octave date window above; (3) the season; (4) the hymn's
+ * own per-annum default.
  */
-export function getHymnDoxologyId(season: Season, winner: DayWinner, perAnnumId: string): string {
-  return resolveSeasonalPropersId(season, winner, {
-    perAnnum: perAnnumId,
-    bySeason: bySeason.bySeason,
-    byFeastId: byFeast.byFeastId,
-  });
+export function getHymnDoxologyId(day: LiturgicalDay, perAnnumId: string): string {
+  const winner = resolveOfficeWinner(day);
+  const feastOverride = winner.kind === 'sanctoral' || winner.kind === 'temporal' ? byFeast.byFeastId[winner.id] : undefined;
+  if (feastOverride) {
+    return feastOverride;
+  }
+  if (isAssumptionOctaveWindow(day.date)) {
+    return NAT_DOXOLOGY_ID;
+  }
+  return bySeason.bySeason[day.season] ?? perAnnumId;
 }