feat: adopt security zones and explicit workload refs

Assistant: codex
Assistant-Model: gpt-5.6-sol
Assistant-Session: 01a0291a-1e87-7151-9934-fcbfe3f65eb1

examples/inventory.seed.yaml

@@ -10,6 +10,9 @@ actors:
       - agt-task-bridge
     ttl_hours: 24
     description: "ops-bridge tunnel agent for state-hub"
+    zone_subject:
+      applicability: applicable
+      workload_id: ops-bridge-tunnel
 
   agt-codex-interhub-bootstrap:
     type: agt
@@ -17,6 +20,9 @@ actors:
       - agt-interhub-bootstrap
     ttl_hours: 2
     description: "Short-lived agent access for attended Inter-Hub bootstrap"
+    zone_subject:
+      applicability: applicable
+      workload_id: codex-interhub-bootstrap
 
   adm-example:
     type: adm
@@ -24,6 +30,9 @@ actors:
       - adm-full
     ttl_hours: 48
     description: "Example human operator — replace with per-person adm-* actors"
+    zone_subject:
+      applicability: not-applicable
+      reason: human operator retains native actor identity
 
   atm-backup-daily:
     type: atm
@@ -31,6 +40,9 @@ actors:
       - atm-backup-daily
     ttl_hours: 8
     description: "Example nightly automation actor"
+    zone_subject:
+      applicability: applicable
+      workload_id: backup-daily
 
 hosts:
   example-host:
@@ -38,4 +50,4 @@ hosts:
       agt:
         - agt-task-bridge
       atm:
-        - atm-backup-daily
+        - atm-backup-daily