test(of): pin the Nativity Vigil at entry 3, not entry 9

Fix round 1 (coordinator review). The Nativity Vigil (24 December,
Sollemnitas) bands at entry 3 (30) rather than entry 9 (90) as a direct
consequence of this task's ruling, but nothing pinned it -- a future
branch-reorder (e.g. inserting an entry between 3 and 9, or loosening
entry 9's date guard) could silently revert it to 90 with the suite
green.

Adds one row to part2_cases with a comment recording: the Tabula's own
entry 9 textually covers 24 December as a late-Advent feria, yet Phase
1 gives that civil day the of-nativity-vigil identity at Sollemnitas
because the Vigil Mass is celebrated that evening -- the same
civil-day-granularity shape Holy Thursday already settles (entry 2,
not entry 1); Phase 2 classifies Phase 1's emitted identity rather
than overriding it. Unobservable on the universal calendar today (no
competing candidate on 24 December); live under a proper/diocesan
overlay, where a proper solemnity (entry 4, band 40) loses to the
Vigil at 30 but would beat it at the textually-arguable 90.

No production code change -- test-only, per the coordinator's ruling
to pin current behaviour rather than alter it.

0 files changed, 0 insertions, 0 deletions