Install stop-signal handlers in the SLURM manager CLI

[dotsdl]

Summary

The SLURM start command ran manager.start() with no signal handling, so SIGTERM — the signal systemd/scancel/supervisors actually send — terminated the process without running ComputeManager.start()'s finally block. The result was an orphaned ComputeManagerRegistration in the state store on every normal shutdown (only an interactive Ctrl-C / SIGINT cleaned up).

This wires the start command to alchemiscale.compute.signals.install_stop_handlers, which registers SIGHUP/SIGINT/SIGTERM handlers that call manager.stop() (now interruptible, so it wakes the inter-cycle sleep promptly) and let the loop unwind through its deregistration finally.

install_stop_handlers(manager)
try:
    manager.start()
except KeyboardInterrupt:
    pass

Dependency

Requires the install_stop_handlers helper (and interruptible-sleep changes) added in the core repo:
OpenFreeEnergy/alchemiscale#503. Merge that first.

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