- Implement four-state PBS GC logic in proxmox-monitor.sh:
- probe-failed: unparseable JSON, store not found, or empty body → FAIL
- running: collection in progress (last-run-endtime absent, upid present) → DO NOT FAIL
- stale: no completed run within 48h → FAIL, naming last completed run age
- healthy: completed within 48h → PASS, naming endtime and pending bytes
- Add tests/test_pbs_gc_states.sh covering all four states
- Proves the test bites on the pre-fix version (5/6 tests fail)
- All 6 tests pass against the fixed version
- Update contract-run.sh to map disk-gc-threat-response -> scripts/disk-gc-scan.py
- Update Execution sections of host-scheduled contracts:
infrastructure-monitoring, zulip-health, litellm-health, agent-health-check,
disk-gc-threat-response, pm2-self-heal
Adding note that execution is host-scheduled via cron, not agent session ack.
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