feat(of): full sanctoral calendar + weekday/memorial readings

Populate the OF General Roman Calendar sanctoral and extend the OF readings to
weekdays and sanctoral days.

Sanctoral calendar (roman-calendar.ini: 29 -> 202 celebrations):
- scripts/gen-sanctoral.go generates it from calapi.inadiutorium.cz (authoritative
  General Roman Calendar) -- English name/rank/colour from general-en, Latin from
  general-la, Polish from niedziela DayInfo (obligatory celebrations). Fixed dates
  the temporal engine already computes are excluded. VALIDATED: my engine's
  observed rank agrees with calapi on all 86 obligatory sanctoral days of 2026
  (0 mismatches).

Precedence fix (precedence.go): an optional memorial no longer displaces the
weekday as the DEFAULT observed celebration (it sorts below the ferial, shown as
an option) -- matching the General Roman Calendar / calapi.

Readings (of-lectionary.ini: 254 -> 1018 entries) via genlect-of.go:
- Weekday (ferial) 2-year cycle I/II, keyed <ferial-slug>-<WeekdayCycle>, harvested
  from niedziela over 2020-2025 (multiple years per cycle; retry-on-failure so a
  glitch year never poisons a key; only TRUE ferials + optional-memorial days,
  where niedziela shows the ferial).
- Obligatory memorials keyed by their OWN slug (niedziela shows their proper, e.g.
  Barnabas -> Acts 11, or the ferial for memorials without a proper) -- never
  miskeyed to a ferial position.
- caldata.Readings: OF resolves slug+SundayCycle | slug+WeekdayCycle, else a
  memorial falls back to the day's ferial readings.
- Source-glitch normalisation (1J->1 J, PnP->Pnp).

books.ini: canonical names "Song of Solomon" and "The Acts" added as their own
[en] forms (ToEnglishRef emits the canonical; it must resolve). Fixes ~32
cross-chapter Song-of-Songs/Acts citations.

Coverage: 359/365 days of 2026 render (98.4%); 6 residual ferial positions never a
true-ferial in 2020-2025. EF sanctoral and OF psalm renumbering still pending.

1 files changed, 29 insertions, 6 deletions

diff --git a/internal/caldata/readings.go b/internal/caldata/readings.go
index 2810026..49109f5 100644
--- a/internal/caldata/readings.go
+++ b/internal/caldata/readings.go
@@ -19,14 +19,37 @@ func Readings(sel calendar.Selection, layers []calendar.Layer, date time.Time, d
 	if len(rs) > 0 {
 		return rs
 	}
-	// temporal table: EF by slug, OF by slug+cycle.
-	key := day.Observed.Slug
-	if sel.Form != "old" && day.SundayCycle != "" {
-		key = day.Observed.Slug + "-" + day.SundayCycle
+	// temporal table: EF by bare slug; OF by slug+cycle. Sundays & solemnities
+	// use the 3-year Sunday cycle (A/B/C); ferial weekdays use the 2-year
+	// weekday cycle (I/II). Sunday-slugs and weekday-slugs are disjoint, so
+	// trying both cycle suffixes is unambiguous.
+	if sel.Form == "old" {
+		if r := TemporalReadings("old", day.Observed.Slug); len(r) > 0 {
+			return r
+		}
+	} else {
+		for _, cyc := range []string{day.SundayCycle, day.WeekdayCycle} {
+			if cyc == "" {
+				continue
+			}
+			if r := TemporalReadings("new", day.Observed.Slug+"-"+cyc); len(r) > 0 {
+				return r
+			}
+		}
 	}
-	if r := TemporalReadings(sel.Form, key); len(r) > 0 {
-		return r
+	// OF: a sanctoral memorial / optional memorial with no proper readings of its
+	// own reads the FERIAL (weekday) readings of the day -- the ordinary OF rule.
+	// Compute the pure temporal (no sanctoral) to get the day's ferial slug.
+	if sel.Form != "old" && day.Observed.Layer != "temporal" &&
+		day.WeekdayCycle != "" && date.Weekday() != time.Sunday {
+		temp := calendar.Compute(date, sel, nil)
+		if temp.Observed.Layer == "temporal" {
+			if r := TemporalReadings("new", temp.Observed.Slug+"-"+day.WeekdayCycle); len(r) > 0 {
+				return r
+			}
+		}
 	}
+	// EF: a green-season weekday with no proper Mass repeats the preceding Sunday.
 	if sel.Form == "old" && day.Observed.Layer == "temporal" && date.Weekday() != time.Sunday {
 		sun := date.AddDate(0, 0, -int(date.Weekday())) // preceding Sunday (Sunday = 0)
 		sd := calendar.Compute(sun, sel, layers)