feat(windows): add recoverable existing-agent credential upgrade

backend/tests/test_agent_management_frontend.py

@@ -62,6 +62,7 @@ class AgentManagementFrontendTests(unittest.TestCase):
         self.assertIn('id="agentSite"', managed)
         self.assertIn('id="agentZone"', managed)
         self.assertIn('id="agentDisplayName"', managed)
+        self.assertIn('data-can-manage-agents="true"', managed)
         self.assertIn("Linux x64 — coming later", managed)
         self.assertIn("Linux ARM64 / Raspberry Pi — coming later", managed)
 
@@ -100,6 +101,11 @@ class AgentManagementFrontendTests(unittest.TestCase):
             'api("/api/agent-enrollments", {',
             source,
         )
+        self.assertIn(
+            'api("/api/agent-credential-transitions", {',
+            source,
+        )
+        self.assertIn("Upgrade credential", source)
 
         for unsafe in (
             "innerHTML",
@@ -153,9 +159,10 @@ class AgentManagementFrontendTests(unittest.TestCase):
             source,
         )
         self.assertIn(
-            'link.download = "MinerOpsAgent-Windows.zip"',
+            'packageFilename = "MinerOpsAgent-Windows.zip"',
             source,
         )
+        self.assertIn("link.download = packageFilename", source)
         self.assertIn(
             "window.URL.revokeObjectURL(downloadUrl)",
             source,