Decompose spec 0045 into two iterations. Iteration 1 (engine + registry
core): Source::bounds() + window_of, M1FieldSource::bounds(), and the
aura-registry lineage module (FamilyKind / FamilyRunRecord / Family,
group_families, next_family_id, the three *_member_reports extractors,
Registry::append_family / load_family_members) with round-trip and
per-name-counter tests. Iteration 2 (CLI surface): aura mc, family-aware
aura runs (families / family [rank]), sweep/walkforward family persistence
via append_family with --name, and the window_of migration of the
manifest-window scans.
refs #70
Brummel
d6daaef009