Update retention policy test case to use 2025.2-compatible features; set minimum API version on others that need a newer Seq target (we may improve compatibility with older Seq versions prior to a full 2026.1 client release)

Author: nblumhardt

test/SeqCli.EndToEnd/Dashboard/RenderTestCase.cs

@@ -7,6 +7,7 @@
 
 namespace SeqCli.EndToEnd.Dashboard;
 
+[CliTestCase(MinimumApiVersion = "2026.1.0")]
 public class RenderTestCase : ICliTestCase
 {
     public Task ExecuteAsync(

test/SeqCli.EndToEnd/RetentionPolicy/RetentionPolicyBasicsTestCase.cs

@@ -18,7 +18,7 @@ public async Task ExecuteAsync(SeqConnection connection, ILogger logger, CliComm
         exit = runner.Exec("retention list", "-i retentionpolicy-missing");
         Assert.Equal(1, exit);
 
-        exit = runner.Exec("retention create", "--after 10h --delete-all-events");
+        exit = runner.Exec("retention create", "--after 10h --data-source stream --delete-all");
         Assert.Equal(0, exit);
 
         var id = runner.LastRunProcess.Output.Trim();
@@ -36,13 +36,13 @@ public async Task ExecuteAsync(SeqConnection connection, ILogger logger, CliComm
         Assert.Equal(1, exit);
 
         var deleteSignal = "signal-m33303,(signal-m33301~signal-m33302)";
-        exit = runner.Exec("retention create", $"--after 10h --delete \"{deleteSignal}\"");
+        exit = runner.Exec("retention create", $"--after 10h --data-source stream --delete \"{deleteSignal}\"");
         Assert.Equal(0, exit);
 
         exit = runner.Exec("retention create", "--after 10h");
         Assert.Equal(1, exit);
 
-        exit = runner.Exec("retention create", $"--after 10h --delete-all-events --delete \"{deleteSignal}\"");
+        exit = runner.Exec("retention create", $"--after 10h --data-source stream --delete-all --delete \"{deleteSignal}\"");
         Assert.Equal(1, exit);
     }
 }

test/SeqCli.EndToEnd/Templates/TemplateExportImportTestCase.cs

@@ -8,7 +8,7 @@
 
 namespace SeqCli.EndToEnd.Templates;
 
-[CliTestCase(MinimumApiVersion = "2024.3.0")]
+[CliTestCase(MinimumApiVersion = "2026.1.0")]
 public class TemplateExportImportTestCase : ICliTestCase
 {
     readonly TestDataFolder _testDataFolder;

test/SeqCli.EndToEnd/Workspace/WorkspaceBasicsTestCase.cs

@@ -7,6 +7,7 @@
 
 namespace SeqCli.EndToEnd.Workspace;
 
+[CliTestCase(MinimumApiVersion = "2026.1.0")]
 class WorkspaceBasicsTestCase : ICliTestCase
 {
     public async Task ExecuteAsync(