When the broker answers human-required or tester-required, the CLI
now prints a second line saying the bus accepts these commands only
from its own tree and to run `mosaic` on PATH on a pinned host. The
entry block becomes an exported run(); exit codes are unchanged.
Lands Darkwing's row 130 round 1 candidate, approved by Filbert in
comment 28520 (rev 1228). Candidate manifest 9a5de54d, all four files
match. Landing gate on 9e837ce5f: 23 suites, GATE_PASSED 00:44:07Z.
Co-Authored-By: Claude Opus 5.5 <[email protected]>