The control API already takes `signal` (kill only: that signal once,
instead of the graceful INT, TERM, KILL sequence) and `force_kill`
(SIGKILL at once); xcecli could not send either. `jobs kill` now has
-s/--signal <name|number> (names in any case, SIG prefix optional, sent
upper case without it) and --force, in both the job-ID and the filter
request; using both at once, or an empty signal, is refused before any
request. stop and resume get neither (the server rejects a signal there).
Kill help and docs/xce.md "Killing and stopping jobs" document the flags.
Co-Authored-By: Claude Opus 5.5 (1M context) <noreply@anthropic.com>
Rongsong Shen
954c96cf5b
