temporal(ef): the Sacred Triduum's own Latin identity, RG 91 entry 2

Holy Thursday, Good Friday and Holy Saturday resolved to the generic
Passiontide ferial slugs with no distinct identity of their own -- rank
and colour were already correct (RG 91 entry 2; Holy Thursday's white
per RG 128(b)/RG 122), only Celebration.names/subject were missing.

Keeps the slug (RG 91 entry 2 is identified structurally, off rank and
Easter offset, by Precedence_ef.band -- never off the slug -- so
renaming it would touch precedence for no reason and break the lectio
differential's own slug mapping for these three lectionary keys, the
same reasoning already given for Holy Family/Holy Name). Carries the
identity in Celebration.names instead, the same treatment those two
established: Latin, not English, to avoid reading the oracle this axis
is compared against.

Names sourced from both photographic scans, word for word, corroborated
by the electronic transcription's own table-of-contents-style listing at
the identical three headings (three-way agreement, nothing to
adjudicate): "Feria V in Cena Domini" (Holy Thursday), "Feria VI in
Passione et Morte Domini" (Good Friday -- not the transcription's own
informal "Feria VI Parasceve" used in passing elsewhere), "Sabbato
Sancto" (Holy Saturday).

Also tags subject = Lord, going further than Holy Family/Holy Name
strictly required (they needed it only because band's entry 14 reads
subject to outrank a colliding fixed feast; entry 2 here needs no such
thing). Safe: disposition's RG 112(a) branch only fires when both sides
of an occurrence are tagged Lord, and no Lord-subject sanctoral entry
has a fixed civil date inside Holy Week's own movable range; any Class1
sanctoral entry landing there (e.g. a transferred Annunciation) reaches
disposition's earlier, subject-blind Transfer branch first regardless.
Verified against the full 1583-9999 domain: zero
observed/commemorations/transferred_* difference traceable to the tag.

test_golden.ml's describe gains a name_la field alongside subject, for
the same reason subject was added: a names-only change is otherwise
invisible to every pin whose rank/colour/slug are already correct (this
task's own catalogued vacuity flavour #1). Six existing pins move from
subject=temporal to subject=lord (the three Easter-extreme Holy Saturday
pins, 2016's Good Friday, and the 2026 Holy Thursday/Good Friday pair);
the rest gain name_la=- by construction (no other temporal-cycle
candidate carries a name yet).

Mutation-tested: reverting temporal_ef.ml alone (keeping the tests)
reddens the new Rite_ef unit test plus five golden pins across two
independent layers.

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