Redesign the Easter-octave backlog: floor-gated, one per day

Replaced the multi-day cascading queue with the actual intended design:
only candidates at or above duplex-majus are worth carrying out of the
Palm-Sunday-through-Low-Sunday span at all - below that, a candidate
simply lapses for the year. Of those that clear the floor, the Nth day
after Low Sunday celebrates the Nth one (native-date order), winning
outright with no rank fight, demoting whatever's natively there to a
commemoration - one per day, positional, not a free-day search.

Caught a real bug while re-verifying: the ordinary single-hop transfer
check was independently leaking Low Sunday's own signal into the next
day, letting a below-floor candidate bypass the new gate. Fixed by
excluding the whole span from that path.

Inventoried the only duplex-majus+ candidates that can ever fall in the
reachable window (St. Benedict, St. Gabriel the Archangel, the
Annunciation, St. Mark, Ss. Philip & James), then bumped St. Patrick's
own rank to duplex-majus by direct instruction, adding him as the 6th.

Co-Authored-By: Claude Sonnet 5 <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_017XMSokiTD2Qc5vPP2YQu3Q

src/data/calendar/saints/st-patrick.yml

@@ -1,12 +1,18 @@
-# Read directly from the reference engine: untagged/default [Rank]
-# block of `web/www/horas/Latin/Sancti/03-17.txt` -- "vide C4;;Duplex;;3;;".
+# Reference source: untagged/default [Rank] block of
+# `web/www/horas/Latin/Sancti/03-17.txt` -- "vide C4;;Duplex;;3;;" (plain
+# Duplex). Rank bumped to duplex-majus here by direct instruction
+# (2026-09-01) -- a deliberate departure from the source, not a
+# transcription of it (see CLAUDE.md's "Not a reconstruction" -- this app
+# doesn't take the reference's own rank at face value everywhere, e.g.
+# the existing late-canonization deflation convention; this is the same
+# kind of deliberate move in the other direction).
 # Own proper [Oratio]; no [Ant 1] of its own, so the Benedictus antiphon
 # falls back to Common of a Confessor Bishop (C4), matching
 # st-andrew-corsini.yml. No Lectio7-9 in the source (6-lesson office).
 id: st-patrick
 name: "St. Patrick, Bishop and Confessor"
 nameLa: "Sanctus Patricius, Episcopus et Confessor"
-rank: duplex
+rank: duplex-majus
 common: common-of-a-confessor-bishop
 propers: "st-patrick"
 minorHoursCommon: common-of-a-confessor-bishop