Wire the Matins psalmody-override category tier into real resolution

getMatinsPsalmodyOverride is now a genuine 3-tier lookup: proper
(saints/) -> Common (categories/, joined via the winner's own
SaintRecord.common) -> the plain ferial fallback, reversing the earlier
"category files are documentation-only" decision now that two
categories are trusted. Category files gain an `aliases` field;
common-of-a-martyr.yml lists common-of-a-martyr-bishop, since the
reference engine's own Matins psalmody redirects that Common outright
to plain Martyr — so its three Duplex+ saints (Ignatius, Callistus,
Boniface, none with proper text of his own) get real Common-tier
content with no new authoring.

tests/hours/matins.test.ts's old ferial-fallback proof (St. Ignatius)
is rewritten as a Common-tier proof; a fresh ferial-fallback proof
(St. John Bosco, an unauthored Confessor category) replaces it.

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

src/hours/matins.ts

@@ -315,10 +315,12 @@ export function resolveOrdo(date: string): ResolvedOrdo {
     parts.push({ kind: 'te-deum', text: resolveCommon('te-deum') });
   } else if (threeNocturns) {
     // A Duplex+ weekday feast — genuinely different psalmody from a real
-    // Sunday's (see hours/matins-psalmody-overrides.ts's own doc
-    // comment), not the same content reused. Uses that saint's own
-    // Common-category override when authored, falling back to the plain
-    // ferial weekday table (redistributed into 3 nocturns) otherwise.
+    // Sunday's, not the same content reused. getMatinsPsalmodyOverride
+    // itself does the proper -> Common -> (nothing) tiering; only the
+    // final "nothing authored at all" tier — the plain ferial weekday
+    // table, redistributed into 3 nocturns — lives here (see
+    // hours/matins-psalmody-overrides.ts's own doc comment for the full
+    // three-tier picture).
     const override = winner.kind === 'sanctoral' ? getMatinsPsalmodyOverride(winner.id) : undefined;
     if (override) {
       parts.push(...sundayPsalmNocturn(override.nocturn1, day));