feat(checks): per-entity monitoring override; service:haos opts out

A `monitoring` attribute on an entity now overrides its type's declaration:
"none" opts out, a list overrides the kinds. service:haos uses it to opt out —
haos blocks SSH (no process probe can reach it) and the VM is already covered
by vm:haos's vm-status check, so the redundant process check only ever reported
false-down. vm:haos -> service:haos via provides confirms the coverage.

seeds/inventory.yaml

@@ -265,7 +265,8 @@ entities:
      attributes: {url: "https://zimaos.hubris.network",
                   doc_page: knowledge/wiki/vms/100-zimaos.md}}
   - {slug: "service:haos", type: service, name: haos,
-     attributes: {doc_page: knowledge/wiki/vms/108-haos.md}}
+     attributes: {doc_page: knowledge/wiki/vms/108-haos.md,
+                  monitoring: none}}            # redundant: vm:haos covers liveness via vm-status; haos blocks SSH so a process check can't reach it
   - {slug: "service:teddycloud", type: service, name: teddycloud,
      attributes: {url: "https://teddy.hubris.network",
                   doc_page: knowledge/wiki/containers/131-teddycloud.md,