refactor(calendar): Rank int enum -> unified string token (OF unchanged, oracle 0 mismatches)

Adds EF rank constants (class-1..4, commemoration); ofRankOrder() for the two
ordered comparisons; buildCelebration defaults missing rank to ferial.

1 files changed, 5 insertions, 2 deletions

diff --git a/internal/calendar/calendar.go b/internal/calendar/calendar.go
index 3465182..98dec43 100644
--- a/internal/calendar/calendar.go
+++ b/internal/calendar/calendar.go
@@ -26,10 +26,10 @@ func Compute(date time.Time, sel Selection, layers []Layer) LiturgicalDay {
 		}
 		// On band-2 privileged days only solemnities survive (and they transfer);
 		// on Sundays (band 6) only feasts and solemnities compete.
-		if td.Privileged && cel.Rank < RankSolemnity {
+		if td.Privileged && ofRankOrder(cel.Rank) < ofRankOrder(RankSolemnity) {
 			continue
 		}
-		if td.Sunday && cel.Rank < RankFeast {
+		if td.Sunday && ofRankOrder(cel.Rank) < ofRankOrder(RankFeast) {
 			continue
 		}
 		effective := transferIfImpeded(cel, when, sel)
@@ -105,6 +105,9 @@ func buildCelebration(slug string, rc RawCelebration) Celebration {
 			c.Name[strings.TrimPrefix(k, "name.")] = v
 		}
 	}
+	if c.Rank == "" {
+		c.Rank = RankFerial
+	}
 	if m := massFrom(rc.Fields); len(m.Readings) > 0 {
 		c.Masses = append(c.Masses, m)
 	}