The plain ferial hymn's Monastic source (Day1-6 Hymnus,
Psalterium/Special/Matutinum Special.txt) carries a real "*" seasonal-
substitution marker, live-checked against the reference engine. Splits the
hymn's own natural doxology ending into a new per-annum companion file and
swaps it via getHymnDoxologyId/appendDoxology, same pattern already used by
Prime and Compline.
Co-Authored-By: Claude Sonnet 5 <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_01AGjUyhUZJaSjiniEmnLdak
