feat(ef): RG 497, the Conversion of St Paul takes the Apostles preface

RG 497 ("in Missis festivis et votivis Apostolorum et Evangelistarum")
carries no natalicium restriction, unlike RG 475(e)'s Creed clause --
preface_apostle_slugs already includes one non-natalicium sibling (In
Commemoratione S. Pauli, 30 June) on this exact reasoning.
conversion-of-st-paul (25 January) was left off pending a witness: the
FIUV Ordo's own single window has 25 January impeded by a Sunday.

Now witnessed four times, two independent publishers, four civil
years: the Latin Mass Society Ordo's 2023-2024 and 2024-2025 editions
both read "Pr of the Apostles" on their own unimpeded 25 January
(2024, 2025); extraordinaryform.org's 2024-2025Ordo.pdf and
2026-2027Ordo.pdf independently agree on their own unimpeded years
(2025, 2027, spot-checked, not wired in as a fixture). Every source's
2026 edition agrees 25 January is impeded that year and produces no
data point at all. No source disagreed with the textual reading.

Surveyed every other Apostle/Evangelist-named slug in
data/ef/sanctoral.sexp before concluding the list needed exactly this
one addition: the Dedication of the Basilicas of Sts Peter & Paul (18
November) is confirmed NOT an RG 497 trigger (all three LMS editions
read "Pr of the Dedication of a Church", not "Apostles" -- it is about
the buildings, not the Apostles in person); the Vigil of Sts Peter &
Paul (28 June) is confirmed "Common Pr", corroborating the pre-existing
"no vigil ever reaches this branch" comment.

Blast radius, measured exhaustively (1583-9999, new permanent sweep in
test_rubrics_ef.ml): 7217 domain years have 25 January unimpeded and
observed; all 7217 now read Apostles, zero exceptions.

Claude-Session: https://claude.ai/code/session_017ZBxCCRM2ojnBupp3SBxV9

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