The plain ferial fallback was a single fixed year-round text that was
actually just Monday's own antiphon, mislabeled in its own comment as
live-verified for 2026-09-06 (a Sunday). The real Monastic 1617 source
genuinely varies this antiphon Sunday-Saturday, same shape as the Matins
hymn's own weekday cycle. Adds the six missing weekday variants and
dispatches on weekday in resolveMatinsInvitatoryText.
Co-Authored-By: Claude Sonnet 5 <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_01W8cttEhwbN3f6hiHQHqCae
