docs(ef): M13 adjudicated colitur; Mass I is unreachable, not unwitnessed

Two open questions closed, both by looking rather than reasoning.

M13 listed three possibilities for 19 March 2027 and stayed open because
none was confirmed. The live one was (b): a rubric at St Joseph's own
Proprium Sanctorum entry overriding the general table, "the same shape as
the Annunciation's own Attamen clause", its text simply not yet found. It
was looked for directly. Joseph's entry runs from its heading straight
into the Introit with no rubric of any kind -- and the analogue does not
exist where the note placed it either: the Annunciation's entry does the
same. That exception lives in RG 96, a general rubric about transferring
an impeded I-class feast, not in its propers, so there is no precedent
for a propers-level override at all.

With (b) eliminated and (c) still unsupported, (a) stands: RG 91 ranks a
I-class feast above a III-class Passiontide feria, Joseph is not impeded
so RG 96 never engages, and colitur observes him. Recorded with its
limit, because this is elimination and not proof: the specific hypothesis
named is false, which is weaker than showing no rubric anywhere says
otherwise.

Separately, the note that Mass I of the BVM Saturday needed an
Advent-Saturday oracle year to corroborate it is answered: there is no
such year and cannot be. Advent has no IV-class ferias -- Class2 from 17
December, Class3 before -- and RG 78 requires a IV-class feria. Zero
IV-class Advent Saturdays across 2000-2100. Its single witness is not a
gap in the research but the only evidence obtainable. The branch is kept:
the Missal does print the Mass for Advent, RG 309's subject being Masses
that may be celebrated as votive, and an overlay producing such a day
would otherwise fall through silently.

Register: sections 6.13 addendum and 6.14.

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