Registry::load_family_members() exposes the bare name factor while
aura_runner::reproduce::load_family exact-matches only the derived C18
handle '{family}-{run}' — the natural list-then-reproduce workflow
dead-ends on its first attempt (found by the #295 fieldtest; predates
the extraction byte-identically). The test pins: the enumerated
identity of an unambiguous single-run family resolves through
load_family to the same family the canonical handle names.
refs #298
claude
78e68e6002