docs(ef): fix round 1 corrections (F2-F5) -- inert fields, a date, an attribution, RG434(b)

F2: the task report's "colour/subject/names on the Litanies entry are
currently inert" was false for names -- test_oracle.ml's identity axis
reads Names.find on every commemoration, and the invented English name is
exactly why 2026-04-25 registers as a Comm_identity_mismatch, the reason
M5 had to be re-gated. Corrected precisely, field by field, in the report.

F3: Easter 2027 is 28 March, not 18 April, as previously stated in the
report's own "layer 4 is blind to the transfer" reasoning. The conclusion
survives (28 March is not 25 April); the date is corrected.

F4: "the exhaustive property sweep caught this immediately" was a wrong
attribution, in the report, the register, and calendar.ml's own comment.
The committed exhaustive sweep walks 1583-9998 in order and aborts at the
first failure; the years actually reported (5700, 4747) were draws from
prop_invariants, the default dune test run's 200-year random sample.
Corrected in all three places.

F5: the Litanies' privileged commemoration is due in the MASS specifically
(RG 108 + RG 81), never a separate Office answer -- colitur emits one
resolved day, and the M20 adjudication rests on that being the Mass
reading. Stated explicitly now in M20's own note, the register, and
precedence_ef.ml's own RG111(b) comment.

Also added to M20 and the register: Rubricae Generales Missalis Romani
n. 434(b) ("VIII - De diversis Missae partibus", "D) De orationibus", "I
- De orationibus in genere"), verified word for word against all three
documents -- word-identical to RG 111(b) but explicitly scoped to the
Mass ("post orationem Missae"), answering the objection that RG 111
(Caput XVI, which RG 106 says governs both Office and Mass) might be read
as Office-shaped. Moves the M20 adjudication from "moderate-high, not
certain" to near-certain.

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