Same seasonal-overlay shape as Advent, live-verified against the reference
engine across 5 Paschaltide Sundays. Generalized sundayNocturnFor to a
season-keyed lookup covering both Advent and Paschaltide.
Confirmed two related non-gaps while investigating: Christmastide/post-
Epiphany Sundays have no seasonal block in the source, and a Duplex+ saint
winning outright on a Sunday deliberately still uses the fixed Sunday
psalmody per this app's own documented design (readings still surface the
saint via the separate pool) — neither needs a fix.
Co-Authored-By: Claude Sonnet 5 <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_017XMSokiTD2Qc5vPP2YQu3Q
