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Per direct instruction, and explicitly framed as this project's own departure from Monastic 1617 itself: within Dec 26-30 inclusive (exactly one real Sunday falls somewhere in that window every year), whichever date is the actual Sunday always wins as Nat1-0 outright, with no rank check at all -- even Stephen/John/Holy Innocents (Duplex II. classis) get fully displaced, not just commemorated. The displaced saint isn't commemorated in place either; he reappears in full as Dec 30's own winner instead (the block's one date with no fixed saint of its own). Rank never matters for this rule -- confirmed with Becket (Semiduplex) transferring the same way as the Duplex-II-classis saints. This deliberately diverges both from what Monastic 1617 itself does on Dec 26-29 (live-verified two commits ago: the saint wins there, Sunday merely commemorated) and from the general privileged-sunday transfer rule elsewhere (which only transfers ranks below duplex-majus and commemorates everything else in place) -- this window transfers every rank and commemorates nothing in place, a genuinely new, third behavior specific to this 5-day block. Implemented as calendar/index.ts's applyChristmasOctaveSunday, a narrowly-scoped layer in the same spirit as applyMarianSaturday/ applyChristTheKing, rather than by changing the shared decideOccurrence/transfer machinery every other Sunday relies on. Dec 31 and everything outside Dec 26-30 is untouched -- St. Silvester still beats the Sunday there via the plain, unchanged ordinary-sunday rule. Verified against all five possible Sunday positions within the window (Dec 26/27/28/29/30) plus the "nothing displaces anything" control case, each with its own dedicated test in the new tests/calendar/christmas-octave-sunday.test.ts. Updates two existing tests whose assertions were correct under the old rule and are now superseded specifically within this window (Stephen/Innocents no longer win their own Sunday-collision dates there) while confirming the underlying ordinary-sunday rule is still live and real outside it (Dec 31/St. Silvester). Co-Authored-By: Claude Sonnet 5 <noreply@anthropic.com>