[rqd] Fix rqd recovery mode

[DiegoTavares]

Recover mode was never working properly on Linux as when running as under systemctl service, spawned frames were being killed with the rqd process for both belong to the same cgroup.

This change not only changes the .service default KillMode=control-group to KillMode=process but also fixes a bug on the frames hardness:

• frame_cmd.rs — enabled the exit-file harness on Linux and rewrote the wrapper script, which had real bugs: command_pid=$! was captured after a foreground eval (so it was always empty), the trap wrote the raw signal number as the exit code, and bash defers traps while a foreground child runs (kills couldn't be forwarded). The new script runs the command in the background + wait, forwards signals, re-waits until the command truly exits, and writes the exit file atomically (tmp + mv).

LLM usage disclosure

Claude Opus was used to execute the changes on this PR.

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