`hivectl restart [scope]` cycles the scoped containers — composes the
existing stop + start daemon ops client-side (reusing the merged Stop/Start
wire ops + global --socket), so no new wire/c0re surface. Same scope model
as stop/start (--agents/--agent/--ci/--forge/--gateway/--matrix), and
--graceful on the stop half. If the stop phase reports a failure the start
phase is skipped so a half-stopped hive isn't blindly started over.
Regenerated docs/tools/hivectl-cli.md.
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