Author full Christmas-Octave Sunday content, fix a temporal-id override gap

christmas-octave-sunday previously had only its Benedictus antiphon
authored -- no Lauds psalmody override or office bundle, no Prime/Terce/
Sext/None content at all. Adds the full set: Lauds psalmody (3 psalms +
Canticle of the Three Young Men + Laudate, all distinct antiphons),
Lauds capitulum/versicle/hymn ("A solis ortus cardine"), and Prime/Terce/
Sext/None antiphons+chapters (Terce/Sext/None only, matching Gal
4:1-2/4:4-5/4:7 -- the same reading the raw Monastic Tridentinum 1617
source file gives for this Sunday).

Real code gap found and fixed along the way: getMinorHourOverrideId
(hours/resolve-common.ts) only checked the sanctoral branch of
resolveOfficeWinner's result, so a named temporal feast in
ALWAYS_OVERRIDE_TEMPORAL_IDS (marian-saturday, christ-the-king) got a
Lauds psalmody override but silently never a Prime/Terce/Sext/None one,
however much was authored for it. Fixed by mirroring
getPsalmodyOverrideFor's own temporal-id branch (hours/lauds.ts), and
christmas-octave-sunday added to that set.

Content sourced from a "Divino Afflatu 1954" live query rather than
Monastic Tridentinum 1617, since 1617 has no real identity of its own for
this Sunday under its own calendar rules on most Dec 26-29 dates (only
the collect, already authored separately, happened to be pulled from a
date where 1617 did render it) -- consistent with this app's stated
precedent of following D.A. for calendar/precedence even while keeping
1617's shape for the hours themselves elsewhere.

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

TODO.md

@@ -161,6 +161,62 @@ future Martyr-common saint don't need one (Confessors never get a
 Paschaltide variant at all; a Martyr one would need porting `C2p`/`C3p`
 the same way, if and when a saint needing it is authored).
 
+### Christmas-Octave Sunday content — done (2026-08)
+
+Was: only the Benedictus antiphon existed for `christmas-octave-sunday`
+(`christmas-octave-sunday-benedictus-antiphon.yml`) — no collect (a
+separate, older file, `christmas-octave-sunday-collect.yml`, did already
+exist and was untouched here), no Lauds psalmody override or office
+bundle, no Prime/Terce/Sext/None content at all.
+
+Real code gap found and fixed along the way: `getMinorHourOverrideId`
+(`hours/resolve-common.ts`) only ever checked the *sanctoral* branch of
+`resolveOfficeWinner`'s result — a named temporal feast in
+`ALWAYS_OVERRIDE_TEMPORAL_IDS` (`marian-saturday`, `christ-the-king`) got
+a Lauds psalmody override via `getPsalmodyOverrideFor`'s own separate
+check of that set, but silently *never* a Prime/Terce/Sext/None one,
+however much content got authored for it — nothing had actually
+exercised that path until now. Fixed by mirroring `getPsalmodyOverrideFor`
+`hours/lauds.ts`'s own temporal-id branch.
+
+Content itself needed a different source than every other pull this
+session: Monastic Tridentinum 1617 has no real "Dominica Infra Octavam
+Nativitatis" identity of its own under its own calendar rules on most
+Dec 26-29 Sundays (verified live: 2026-12-27 renders as "S. Joannis
+Apostoli," not the Sunday, under `version=Monastic Tridentinum 1617` —
+only the collect happens to be old enough to have been pulled from a
+date, 2029-12-30, where 1617 *did* render it outright). Lauds psalmody,
+office bundle, and Prime/Terce/Sext/None content instead pulled live
+under `version=Divino Afflatu 1954` (2026-12-27), consistent with this
+app's own stated precedent of following D.A. for the calendar/precedence
+layer even while keeping Monastic 1617's shape for the hours themselves —
+this is one of the rare days where that split genuinely can't be
+maintained, since 1617 has nothing of its own to shape. `christmas-
+octave-sunday-collect.yml`'s existing 1617-sourced text was kept as-is
+(cross-checked identical against both the new D.A. query and the raw
+Monastic Tridentinum 1617 source file, `Tempora/Nat1-0.txt`'s own
+`[Oratio]`) rather than replaced.
+
+Files: `lauds-psalmody-overrides/christmas-octave-sunday.yml` (3 psalms +
+Canticle of the Three Young Men + Laudate, all distinct antiphons),
+`lauds-capitulum-/-versicle-/-hymn-christmas-octave-sunday.yml` ("A solis
+ortus cardine"). No `lauds-responsory-christmas-octave-sunday.yml`
+authored — genuinely absent from the live rendering (hymn leads straight
+into the versicle, no short responsory in between), not an oversight;
+left "missing" honestly rather than invented. Prime/Terce/Sext/None all
+four get a proper antiphon (a short "Allelúia, ..." set drawn from the
+day psalter, distinct per hour); Terce/Sext/None each get a proper
+chapter (Gal 4:1-2/4:4-5/4:7, matching the raw 1617 source's own
+`Nat1-0.txt` exactly) with its own versicle per the D.A. live rendering
+(not the 1617 source's own versicle, which reuses one versicle across
+all three hours — a cross-era mismatch flagged here, not silently
+papered over, since this whole day's content already mixes eras out of
+necessity).
+
+Not attempted: `Nat2-0` (Feast of the Holy Name of Jesus) isn't in this
+app's sanctoral/temporal calendar at all yet — a separate, bigger ask if
+wanted (see the original scoping discussion this session).
+
 ### Overlapping octaves — done (2026-08)
 
 Was: `resolveOfficeWinner`/`getDayLabel` picked whichever active octave