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

backend/app/main.py

@@ -25102,37 +25102,30 @@ async def startup_ensure_minerops_agent_tables():
 
 
 @app.get("/api/agent/config")
-async def minerops_agent_config(request: Request):
-    minerops_require_agent_secret(request)
+async def minerops_agent_config(
+    request: Request,
+    authenticated_agent_id: str = Depends(require_agent_identity),
+    zone_service: AgentZoneService = Depends(get_agent_zone_service),
+):
+    routing = zone_service.routing_context(authenticated_agent_id)
+    if routing.routing_reason or routing.agent_zone_id is None:
+        raise HTTPException(
+            status_code=409,
+            detail=(
+                "Agent routing unavailable: "
+                + (routing.routing_reason or "agent_zone_unassigned")
+            ),
+        )
+
+    configuration = zone_service.configuration(authenticated_agent_id)
+    if not configuration:
+        raise HTTPException(status_code=409, detail="Agent configuration unavailable")
 
     return {
         "ok": True,
-        "site_name": "Plexus",
+        **configuration,
         "poll_interval_seconds": 120,
-        "hub_url": "https://plexus.lussier.cc",
-        "ip_ranges": [
-            {
-                "name": "Unit 4",
-                "cidr": "10.30.0.0/22",
-                "enabled": True,
-                "api_port": 4028,
-                "api3_port": 4433,
-            },
-            {
-                "name": "Unit 6",
-                "cidr": "10.80.0.0/22",
-                "enabled": True,
-                "api_port": 4028,
-                "api3_port": 4433,
-            },
-            {
-                "name": "Unit 12",
-                "cidr": "10.90.0.0/22",
-                "enabled": False,
-                "api_port": 4028,
-                "api3_port": 4433,
-            },
-        ],
+        "hub_url": str(request.base_url).rstrip("/"),
         "message": "Agent config from hub.",
     }