test(cli): the exit-signal pin covers every command and drives the text face

The population no longer filters on a JSON face: every module under
src/commands is a member, so a command of any face enters by existing.
Floors move to the widened population (65 commands, 127 sites), and a
fourth describe drives package install, package publish and plugin sign
through a refusal each: one error line, no EEXIT, exit status 1.

Co-Authored-By: Claude <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_016GiHYRmLSNWTfbX9gVQkpz

Author: claude