Replace generic "Reading"/"Gospel" headings with real incipits

Bible-plan readings now carry a generated bilingual incipit label
(bible-book-incipits.ts) instead of falling through to the UI's generic
"Reading" heading. Gospel pericopes (whether from the user's own plan
or nocturn-readings.ts's proper content) get the same treatment via a
new label field on the 'gospel' ResolvedPart, recovering the book from
the reading's own citation when no raw book code is available.

Updates 3 matins.test.ts assertions that used "no label" as a stand-in
for "this is a bible-plan reading" — no longer true now that these
readings carry a real label, so they now key off the label's shape
(string = patristic attribution, object = generated incipit) instead.

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

src/hours/matins.ts

@@ -92,6 +92,7 @@ import { getSaintRecord } from '../calendar/feasts';
 import { getBiblePlanReadings } from '../propers/bible-plan';
 import { getNocturnReadings, type NocturnReading } from '../propers/nocturn-readings';
 import { getOctaveReading } from '../propers/octave-readings';
+import { getGospelIncipitFromCitation } from '../propers/bible-book-incipits';
 import { getMatinsSaintOverride, getMatinsCommonOverride, type MatinsPsalmodyScheme } from './matins-psalmody-overrides';
 import matinsSundayAntiphonsData from '../data/hours/matins-sunday-antiphons.yml';
 import matinsSundayNocturn3OverridesData from '../data/hours/matins-sunday-nocturn3-overrides.yml';
@@ -683,10 +684,12 @@ function nocturnReadingPart(r: NocturnReading): ResolvedPart {
  * whereas two adjacent pool entries could be (and, before this, sometimes
  * were). */
 function gospelReadingPart(r: NocturnReading, homily: NocturnReading | undefined): ResolvedPart {
+  const incipit = getGospelIncipitFromCitation(r.citation);
   return {
     kind: 'gospel',
     text: { text: r.text, status: r.status, citation: r.citation },
     source: r.source,
+    label: incipit ? { la: incipit.la, en: incipit.en } : undefined,
     responsory: r.responsory ? { text: r.responsory, status: { la: 'verified', en: 'verified' } } : undefined,
     homily: homily
       ? { source: homily.source, text: { text: homily.text, status: homily.status, citation: homily.citation } }
@@ -717,10 +720,11 @@ function buildReadingPool(day: LiturgicalDay, temporalId: string, date: string,
     // this file's own header) — a bare pericope, still its own 'gospel'
     // kind so it gets the same distinguishing UI treatment as a proper
     // Gospel+homily.
+    const label = r.label ? { la: r.label.la ?? '', en: r.label.en ?? '' } : undefined;
     parts.push(
       r.isGospel
-        ? { kind: 'gospel', text: { text: r.text, status: r.status, citation: r.citation }, responsory }
-        : { kind: 'lesson', text: { text: r.text, status: r.status, citation: r.citation }, responsory },
+        ? { kind: 'gospel', text: { text: r.text, status: r.status, citation: r.citation }, responsory, label }
+        : { kind: 'lesson', text: { text: r.text, status: r.status, citation: r.citation }, responsory, label },
     );
   }
   // Grouped by the reading's own `nocturn` tag (ascending), not by which id

src/hours/types.ts

@@ -297,6 +297,12 @@ export type ResolvedPart =
       text: ResolvedText;
       nocturn?: number;
       source?: string;
+      /** The traditional "Léctio sancti Evangélii secúndum..."/"A reading
+       * from the Holy Gospel according to..." incipit, shown in place of the
+       * generic "Gospel" heading — see hour-view.ts's renderLessonLabel and
+       * bible-book-incipits.ts. Absent only when the pericope's own book
+       * couldn't be identified. */
+      label?: string | Partial<Record<string, string>>;
       responsory?: ResolvedText;
       homily?: { source?: string; text: ResolvedText };
     };

src/propers/bible-plan.ts

@@ -20,6 +20,7 @@
 import type { LanguageCode, TranslationStatus } from '../psalter/types';
 import { resolvePassages, type ScriptureCitation } from './octave-readings';
 import { getResponsoryForBook } from './matins-responsories';
+import { getBookIncipit } from './bible-book-incipits';
 
 const GOSPEL_BOOKS = new Set(['matt', 'mark', 'luke', 'john']);
 
@@ -37,6 +38,11 @@ export interface BiblePlanReading {
    * data/hours/matins-responsories-by-book.yml — undefined when nothing's
    * seeded for that book yet, an honest absence, not a placeholder. */
   responsory?: Partial<Record<LanguageCode, string>>;
+  /** The traditional "Léctio libri..."/"A reading from..." incipit for the
+   * reading's own (first) book — see bible-book-incipits.ts. Undefined only
+   * for an abbreviation that map doesn't recognize, which shouldn't happen
+   * for anything actually under src/data/scripture. */
+  label?: Partial<Record<LanguageCode, string>>;
 }
 
 interface BiblePlanReadingRecord {
@@ -107,15 +113,17 @@ function resolveReading(record: BiblePlanReadingRecord, bookIndex: number): Bibl
     la: text.la ? 'verified' : 'missing',
     en: text.en ? 'verified' : 'missing',
   };
-  const label = formatCitationLabel(record.passages);
+  const citationLabelText = formatCitationLabel(record.passages);
   const firstBook = record.passages[0]?.book;
   const responsory = firstBook ? getResponsoryForBook(firstBook, bookIndex)?.text : undefined;
+  const incipit = firstBook ? getBookIncipit(firstBook) : undefined;
   return {
     text,
     status,
-    citation: { la: label, en: label },
+    citation: { la: citationLabelText, en: citationLabelText },
     isGospel: isGospelReading(record.passages),
     responsory,
+    label: incipit ? { la: incipit.la, en: incipit.en } : undefined,
   };
 }
 

src/ui/hour-view.ts

@@ -49,9 +49,10 @@ function renderCitation(text: ResolvedText, languages: readonly string[]): strin
 function renderLessonLabel(
   label: string | Partial<Record<string, string>> | undefined,
   languages: readonly string[],
+  fallback = 'Reading',
 ): string {
   if (!label) {
-    return '<h3 class="ordo-part-label">Reading</h3>';
+    return `<h3 class="ordo-part-label">${escapeHtml(fallback)}</h3>`;
   }
   if (typeof label === 'string') {
     return `<h3 class="ordo-part-label">${escapeHtml(label)}</h3>`;
@@ -115,7 +116,7 @@ function renderPart(part: ResolvedPart, languages: readonly string[]): string {
     case 'gospel':
       return `
         <section class="ordo-part ordo-part-lesson ordo-part-gospel">
-          <h3 class="ordo-part-label">Gospel</h3>
+          ${renderLessonLabel(part.label, languages, 'Gospel')}
           ${renderCitation(part.text, languages)}
           ${renderColumns(part.text, languages)}
           ${part.source ? `<p class="ordo-part-citation">${escapeHtml(part.source)}</p>` : ''}