Common-of-an-Angel doesn't exist in the reference engine -- every angel
feast has genuine proper Matins content of its own, so these are
saint-level overrides, not a Common category. Transcribed directly from
the reference engine's source files (Sancti/05-08 etc.) after a live-CGI
attempt mis-extracted a mid-nocturn antiphon change.
St. Michael needed his own file: the psalmody-override lookup keys off
the day's resolved winner id, not the `propers` field, and his own
Matins antiphons/lessons turn out to genuinely differ from Apparition's
despite his calendar file's "word-for-word identical" claim (true only
of the collect).
Co-Authored-By: Claude Sonnet 5 <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_01PhysogLP9eCeKS7JEwRi6y
