Add Ember-day mechanism (privileged feria, not a rank contest) + real content

Researched whether September/Advent Ember days belong in the
movable-feasts.ts table alongside Christ the King/Immaculate Heart of
Mary. Live-verified against the reference engine they don't: Ember days
are privileged ferias (a saint can still win outright against them), not
named feasts contesting the day by rank.

Two smaller pieces instead: calendar/temporal.ts's septemberEmberDayOffset
(Sunday nearest Sept 14, same "nearest" arithmetic adventStart already
used, factored into a shared nearestSunday helper) feeds a new
resolveTemporalCategory check giving those 3 dates privileged-feria-minor
(live-verified correct); calendar/ember-days.ts's applyEmberDay relabels
the day's own temporal id to the Ember day's own (so its real content is
found) when the feria itself wins, or adds a commemoration when a saint
does. Advent Ember days needed no precedence change -- Advent's own
season default already covers them.

Found and fixed a real bug along the way: matins.ts's nocturnReadingIds
only ever pulled a commemorated *sanctoral* id's own readings, never a
commemorated *temporal* one's -- so a commemorated Ember day (the common
case) would never have surfaced its own content. Same root cause as the
day.winner.id gap the IHM relocation fixed earlier, just hiding in the
commemorations loop instead.

Authored all 6 days' real collect + 3 Matins readings each, transcribed
directly from the reference engine (September: Tempora/093-{3,5,6}.txt;
Advent: Tempora/Adv3-{3,5,6}.txt, whose lessons are themselves a
cross-reference to the Annunciation's own Common, followed and
transcribed from there). Kept as 3 separate readings per day rather than
the usual combine-into-one default, since each carries its own
genuinely distinct proper responsory.

Co-Authored-By: Claude Sonnet 5 <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_01VZSAgRi4QE4XRTqVto93zA

src/data/propers/nocturn-readings/ember-advent-wednesday.yml

@@ -0,0 +1,78 @@
+# Matins Nocturn content for Advent Ember Wednesday (Feria IV Quattuor
+# Temporum Adventus) — read directly from
+# web/www/horas/Latin/Tempora/Adv3-3.txt and English/Tempora/Adv3-3.txt.
+# No Monastic-track override file exists for this day (only Adv3-0/1/2/4
+# have one) — confirms the Monastic 1617 track uses this same text.
+#
+# Unlike the other 5 Ember days, Lectio1-3 here are cross-references
+# (`@Sancti/03-25:Lectio7/8/9`) to the Annunciation's own Common
+# (web/www/horas/Latin/Sancti/03-25.txt) — St. Ambrose's homily on Luke
+# 1:26-38, not a Gospel-pericope-plus-homily pattern of its own. Kept as
+# 3 separate readings, each with its own genuinely distinct proper
+# responsory (Responsory3 is this Ember day's own text, not further
+# cross-referenced) — same "don't collapse where each carries real,
+# distinct content" reasoning as the other 5 Ember days.
+id: ember-advent-wednesday
+readings:
+  - nocturn: 1
+    isGospel: false
+    source: "St. Ambrose, Bishop of Milan, Commentary on Luke, Book 2 (from the Annunciation's own Common)"
+    text:
+      la: >-
+        Latent quidem divína mystéria, nec fácile, juxta prophéticum dictum, quisquam hóminum potest scire
+        consílium Dei. Sed tamen ex céteris factis, atque præcéptis Dómini Salvatóris póssumus intellégere, et hoc
+        propensióris fuísse consílii, quod ea potíssimum elécta est, ut Dóminum páreret, quæ erat desponsáta viro.
+        Cur autem non ántequam desponsarétur, impléta est? Fortásse ne dicerétur quod concéperat ex adultério.
+      en: >-
+        The mysteries of God are unsearchable, and it is especially declared by a Prophet, that a man can hardly
+        know His counsels. Nevertheless, some things have been revealed to us, and we may gather from some of the
+        words and works of the Lord our Saviour, that there was a special purpose of God, in the fact that she who
+        was chosen to be the mother of the Lord was espoused to a man. Why did not the power of the Highest
+        overshadow her before she was so espoused? Perhaps it was lest any might blasphemously say that she had
+        conceived in fornication the Holy One.
+    responsory:
+      la: "Clama in fortitúdine, qui annúntias pacem in Jerúsalem: * Dic civitátibus Judæ, et habitatóribus Sion: Ecce Deus noster, quem exspectabámus, advéniet.\nV. Supra montem excélsum ascénde tu, qui evangelízas Sion, exálta in fortitúdine vocem tuam.\nR. Ecce Deus noster, quem exspectabámus, advéniet."
+      en: "O thou that bringest good tidings of peace to Jerusalem, lift up thy voice with strength! * Say unto the cities of Judah, and to the inhabitants of Jerusalem: Behold, our God will come, for Whom we waited.\nV. O thou that tellest good tidings to Zion, get thee up into the high mountain, lift up thy voice with strength.\nR. Behold, our God will come, for Whom we waited."
+    status: { la: verified, en: verified }
+
+  - nocturn: 2
+    isGospel: false
+    source: "St. Ambrose, Bishop of Milan, Commentary on Luke, Book 2 (from the Annunciation's own Common)"
+    text:
+      la: >-
+        Et ingréssus ad eam Angelus. Disce vírginem móribus, disce vírginem verecúndia, disce oráculo, disce
+        mystério. Trepidáre vírginum est, et ad omnes viri ingréssus pavére, omnes viri affátus veréri. Discant
+        mulíeres propósitum pudóris imitári. Sola in penetrálibus, quam nemo virórum víderit, solus Angelus
+        répererit: sola sine cómite, sola sine teste, ne quo degénere depravarétur affátu, ab Angelo salutátur.
+      en: >-
+        And the angel came in unto her. Let us learn from this Virgin how to bear ourselves, let us learn her
+        modesty, let us learn by her devout utterance, above all let us learn by the holy mystery enacted. It is
+        the part of a maiden to be timid, to avoid the advances of men, and to shrink from men's addresses. Would
+        that our women would learn from the example of modesty here set before us. She upon whom the stare of men
+        had never been fixed was alone in her chamber, and was found only by an angel. There was neither companion
+        nor witness there, that what passed might not be debased in gossip and the angel saluted her.
+    responsory:
+      la: "Oriétur stella ex Jacob, et exsúrget homo de Israël, et confrínget omnes duces alienigenárum: * Et erit omnis terra posséssio ejus.\nV. Adorábunt eum omnes reges terræ, omnes gentes sérvient ei.\nR. Et erit omnis terra posséssio ejus."
+      en: "There shall come a Star out of Jacob, and a Man shall rise out of Israel, and shall smite through all the princes of the aliens. * And all the earth shall be His possession.\nV. All kings shall fall down before Him, all nations shall serve Him.\nR. And all the earth shall be His possession."
+    status: { la: verified, en: verified }
+
+  - nocturn: 3
+    isGospel: false
+    source: "St. Ambrose, Bishop of Milan, Commentary on Luke, Book 2 (from the Annunciation's own Common)"
+    text:
+      la: >-
+        Tanti namque mandáti mystérium non hóminis fuit, sed Angeli ore proméndum. Hódie primum audítur: Spíritus
+        Sanctus supervéniet in te. Et audítur, et créditur. Dénique, Ecce, inquit, ancílla Dómini: contíngat mihi
+        secúndum verbum tuum. Vide humilitátem, vide devotiónem. Ancíllam se dicit Dómini, quæ mater elígitur: nec
+        repentíno exaltáta promísso est.
+      en: >-
+        The message of God to the Virgin was a mystery, which it was not lawful for the mouth of men, but only of
+        angels, to utter. For the first time on earth the words are spoken The Holy Ghost shall come upon thee.
+        The holy maiden heareth, and believeth. At length she saith Behold the handmaid of the Lord be it unto me
+        according to thy word. Here is an example of lowliness, here is a pattern of true devotion. At the very
+        moment that she is told she is chosen to be the mother of the Lord she at once declareth herself His
+        handmaid. The knowledge that she was Mother of God caused in the heart of Mary only an act of humility.
+    responsory:
+      la: "Modo véniet Dominátor Dóminus: * Et nomen ejus Emmánuel vocábitur.\nV. Oriétur in diébus ejus justítia, et abundántia pacis.\nR. Et nomen ejus Emmánuel vocábitur."
+      en: "The Lord, the Ruler, cometh quickly. * And His name shall be called Emmanuel.\nV. In His days shall righteousness flourish, and abundance of peace.\nR. And His name shall be called Emmanuel."
+    status: { la: verified, en: verified }