feat(agent): add durable existing-agent credential transitions

backend/tests/test_agent_zones.py

@@ -90,6 +90,23 @@ class FakeRepository:
             "zone_enabled": zone_row["is_enabled"] if zone_row else None,
         }
 
+    def get_agent_configuration(self, agent_id):
+        assignment = self.get_agent_assignment(agent_id)
+        if not assignment:
+            return None
+        zone_row = self.zones.get(assignment.get("agent_zone_id"))
+        return {
+            "agent_id": agent_id,
+            "site_id": assignment.get("site_id"),
+            "agent_zone_id": assignment.get("agent_zone_id"),
+            "site_name": assignment.get("site_name"),
+            "agent_zone_name": zone_row["name"] if zone_row else None,
+            "agent_zone_enabled": zone_row["is_enabled"] if zone_row else None,
+            "networks": [
+                item["network"] for item in (zone_row or {}).get("networks", [])
+            ],
+        }
+
     def assign_miners_to_zone(self, miner_ids, agent_zone_id):
         self.assigned = (list(miner_ids), agent_zone_id)
         return {miner_id: self.assign_result.get(miner_id, "miner_not_found")
@@ -218,6 +235,25 @@ class AgentZoneServiceTests(unittest.TestCase):
         self.assertEqual(result.routing_reason, "agent_zone_conflict")
         self.assertIsNone(result.site_id)
 
+    def test_configuration_uses_only_authenticated_agent_zone_networks(self):
+        self.repository.zones[ZONE_A]["networks"] = [
+            {"id": uuid4(), "network": "10.30.0.0/24"}
+        ]
+        self.repository.zones[ZONE_B] = zone(ZONE_B, SITE_B, name="Remote")
+        self.repository.zones[ZONE_B]["networks"] = [
+            {"id": uuid4(), "network": "10.80.0.0/24"}
+        ]
+        self.checkin(site_id=SITE_A, agent_zone_id=ZONE_A)
+
+        configuration = self.service.configuration("agent-a")
+
+        self.assertEqual(configuration["agent_zone_id"], ZONE_A)
+        self.assertEqual(
+            [item["cidr"] for item in configuration["ip_ranges"]],
+            ["10.30.0.0/24"],
+        )
+        self.assertNotIn("10.80.0.0/24", str(configuration))
+
 
 class AgentZoneRouterTests(unittest.TestCase):
     def setUp(self):