TraceStore::name_kind and read_family resolved taps exactly one
directory below the family handle, so the per-member fan-out layout
sweep/walkforward --trace writes since #224
(<name>/<cell>/<member>/index.json) classified as NotFound and
`aura chart <printed handle>` exited 1. Both sides now resolve depth-1
(campaign nominee layout) and depth-2, with depth-2 members keyed
<cell>/<member> (deterministic sort, C1); the on-disk layout is
unchanged. emit_chart's not-found message no longer suggests re-running
with the unknown handle as --trace (the data-creating command cannot
take an output handle as input); the message prefix stays pinned.
Milestone-fieldtest finding B1 (fixtures: 09da04f); verified against
the fieldtest's own on-disk family and the campaign depth-1 sibling.
Brummel
5616aa6c6a