obleth-gateway v0.9.3

Slurm-provisioned replicas stop getting killed in a loop, and jobs with a walltime submit cleanly.

• Healthy replicas are no longer cancelled on transient probe blips. A busy single-threaded inference server (e.g. llama.cpp) that briefly missed a health probe and passed the next used to accumulate toward the self-heal threshold and get cancelled — then resubmitted, flap, and die again in a loop. The failure counter now decays on every passing probe, so only a sustained outage restarts a replica; the default window is ~5 minutes (OBLETH_PROVISIONER_RESTART_AFTER_FAILURES, now 20). The gateway's separate inference-based zombie check is unchanged.
• Jobs with a time limit submit without a slurmrestd error. A managed model's walltime (e.g. 0-04:00:00) is now converted to the integer minutes slurmrestd expects, instead of being sent as a date string that failed the submit with a 500. Unparseable values are omitted so the partition default applies.