The merge of main's holder test (caller list from the config watch) over C3d's
(no caller list, REG2) left cases the merged holder does not answer; the
holder's code is C3d's, so its test is too, with the moved delivery paths.
Builds: design 47 G REG2 (C3d)
Claude-Session: https://claude.ai/code/session_01NcbgfGKaxw984XyAPfLm4h