feat: improve agent management and speed up tests

backend/openapi/v1.json

@@ -1770,7 +1770,7 @@
         "tags": [
           "admin-join-tokens"
         ],
-        "summary": "Revoke a join token",
+        "summary": "Revoke a join token; with purge=true delete the record for good",
         "operationId": "join_tokens_revoke",
         "parameters": [
           {
@@ -1780,6 +1780,13 @@
             "schema": {
               "type": "string"
             }
+          },
+          {
+            "name": "purge",
+            "in": "query",
+            "schema": {
+              "type": "boolean"
+            }
           }
         ],
         "responses": {
@@ -4345,7 +4352,7 @@
         "required": [
           "token",
           "plaintext",
-          "install_command"
+          "install_commands"
         ],
         "type": "object",
         "properties": {
@@ -4355,8 +4362,8 @@
           "plaintext": {
             "type": "string"
           },
-          "install_command": {
-            "type": "string"
+          "install_commands": {
+            "$ref": "#/components/schemas/InstallCommandsDto"
           }
         }
       },
@@ -4908,6 +4915,25 @@
           }
         }
       },
+      "InstallCommandsDto": {
+        "required": [
+          "linux",
+          "macos",
+          "windows"
+        ],
+        "type": "object",
+        "properties": {
+          "linux": {
+            "type": "string"
+          },
+          "macos": {
+            "type": "string"
+          },
+          "windows": {
+            "type": "string"
+          }
+        }
+      },
       "JoinTokenDto": {
         "required": [
           "id",