cmd(lectio-ef-dump): new EF calendar dumper for colitur's differential oracle

Prints one line per day, sorted ascending, for a civil-year range: date,
weekday, season, week, observed slug, rank, colour, then zero or more
+slug tokens for the day's other (losing) candidates. The line format
matches colitur's `colitur day` output field-for-field so the two
streams diff directly; every column carries lectio's own vocabulary
(season names, slugs, rank/colour spellings) with no translation toward
colitur's — that mapping belongs to the differential comparator, not
this dumper.

Uses calendar.Compute with Selection{Form: "old"} over the embedded
tridentine layer (caldata.Tridentine()), mirroring the setup already
used by oracle_ef_test.go. Lives in cmd/ because internal/calendar
cannot be imported outside this module; colitur's build is untouched.

Note for the comparator: lectio has no RG 111 commemoration-admission
logic, so the trailing +slug tokens are the day's losing candidates,
not admitted commemorations.

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