test(golden): pin Holy Family in three shapes (RG 17(b))

An ordinary year (2026-01-11, no fixed-date competitor), the latest
possible date and the one 13-January collision (2030-01-13, the
fixed Baptism of the Lord excluded entirely by RG91 e14 + RG112(a)),
and the earliest possible date (2024-01-07, Epiphany a Saturday) --
proving RG 17(b)'s own 7-13 January window at both ends, not only
its middle. Every field independently traced against the primary
text before typing it in, per this file's own header rule: season
stays christmastide (RG 72-73, unaffected by which Sunday of it this
is), week stays unset (Christmastide has no numbered weeks at all),
slug is unchanged from the plain Sunday key this date always carried
(temporal_ef.ml's own comment on why RG 17(b) needs no new
lectionary key), rank II class, colour white. Each weekday
independently cross-checked against "date -d <iso> +%A" (GNU
coreutils).

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