calendar: real occurrence/precedence resolution (feast ranks, sanctoral content)

Replaces the FeastRank placeholder with a real ordered FeastClass (the old
pre-1955 six-level scale) and a new TemporalCategory (privileged/ordinary
Sunday/feria). calendar/commemorations.ts's decideOccurrence encodes the
actual precedence rules as explicit, commented branches per category
rather than the reference engine's own opaque numeric weights — this app
targets one ruleset, so the readability trade-off is worth it. Category
membership (data/calendar/temporal-categories.yml) is a best-effort
reconstruction of the pre-1955 tradition, not sourced from a primary text;
expect corrections.

calendar/feasts.ts resolves real sanctoral candidates, and resolveDay()
wires it all together — occurring/temporalCategory are no longer stubs.
isDoubleOrHigher (hours/antiphon.ts) is now a real comparison instead of
a hardcoded false.

Seeded 7 real saints/feasts, each verified directly against Divinum
Officium's own rank data (not reconstructed from memory) as a small,
growable start: St. Lawrence, the Assumption, St. Augustine, the Nativity
of the BVM, St. Michael, All Saints, the Immaculate Conception.

tests/hours/compline.test.ts

@@ -1,8 +1,8 @@
 import { describe, expect, it } from 'vitest';
 import { resolveOrdo } from '../../src/hours';
 
-const MONDAY = '2026-08-10';
-const SUNDAY = '2026-08-09';
+const MONDAY = '2026-06-15';
+const SUNDAY = '2026-06-14';
 
 describe('resolveOrdo("compline", ...)', () => {
   it('is implemented, with fixed psalms 4, 90, 133 regardless of weekday', () => {

tests/hours/prime.test.ts

@@ -5,7 +5,7 @@ import { resolveOrdo } from '../../src/hours';
 // whole psalms (1, 2, 6), the first of which (Psalm 1) has real sample
 // content in data/psalms/001.yml, so these tests can check real verse data
 // without needing every psalm authored.
-const MONDAY = '2026-08-10';
+const MONDAY = '2026-06-15';
 const SUNDAY = '2026-08-09';
 
 describe('resolveOrdo("prime", ...)', () => {