hours: build Terce, Sext, and None

Three separate resolver files (terce.ts/sext.ts/none.ts), not a shared
little-hour module — they're structurally identical but kept independent
by choice. Ordo verified against Divinum Officium (Monastic Tridentinum
1617): opening versicle, self-contained hymn, one antiphon framing three
psalms (no closing repeat, unlike Prime), a capitulum with its own
embedded short versicle/response, the day's own collect, and a closing
identical across all three hours.

Also fills in psalter-distribution.yml's previously-missing Sunday/
Monday/Tuesday psalm entries (Ps 118 sections for Sunday/Monday; Tuesday
turns out to share Wednesday/Thursday's native gradual-psalm set, not a
distinct one). Friday/Saturday's antiphons are derived from each day's
first psalm rather than reusing the native gradual antiphons, since
those two days already use a redistributed, non-native psalm set.

hours/types.ts gains a 'day-collect' part kind — the first ordo to use
the day's own Proper collect rather than a fixed text.

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

src/hours/prime.ts

@@ -108,9 +108,10 @@ function resolvePart(part: HourPart, date: string, day: LiturgicalDay): Resolved
         { kind: 'preces', text: resolveCommon('lesson-close') },
       ];
     }
-    // Not used by Prime — Compline-only.
+    // Not used by Prime — Compline-only, or Little-Hours-only.
     case 'nunc-dimittis':
     case 'marian-antiphon':
+    case 'day-collect':
       throw new Error(`Prime's ordo doesn't support a '${part.kind}' part`);
   }
 }