calendar: exempt Vigils from Our Lady's Saturday's demotion

Refined per direct correction: Our Lady's Saturday is really only a
Simplex-strength standing, not a privileged-feria-minor-shaped one --
a Vigil keeps forcing its own primacy on a Saturday the same way it
already does any other day (see calendar/commemorations.ts's own
transferDirectionOf special-casing for Vigils elsewhere). Only a
Simplex saint alone now loses to it; a Vigil, along with anything
Semiduplex-or-higher, wins outright and Marian Saturday doesn't apply.

Un-does the two test-date moves this same regression prompted last
time (Vigil of St. Lawrence, Vigil of St. John Baptist) -- both dates'
original years work again now that the fix is right.

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

tests/calendar/august-sanctoral.test.ts

@@ -53,10 +53,7 @@ describe('August sanctoral pull (first pass)', () => {
   });
 
   it("the Vigil of St. Lawrence's own vigil rank forces primacy over a real, otherwise-unranked secondary saint", () => {
-    // 2025-08-09 is a Saturday -- collides with the generic Saturday-of-
-    // Mary votive this test isn't about (see tests/calendar/marian-
-    // saturday.test.ts); 2024 keeps it a plain midweek day.
-    const day = resolveDay('2024-08-09');
+    const day = resolveDay('2025-08-09');
     expect(day.winner).toEqual({
       kind: 'sanctoral',
       id: 'vigil-of-st-lawrence',