Laufzeiten: die MCP-Bruecke ist auch ohne Starter in der Sandbox (#712)

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>

tests/ClawdDotNet.Core.Tests/Runtimes/ForeignRuntimeTests.cs

@@ -452,6 +452,20 @@ public sealed class ForeignRuntimeTests : IDisposable
         sandbox.Request.Environment["CLAWD_TASK_ID"].ShouldBe("t-7");
     }
 
+    [Fact]
+    public void With_mcp_the_bridge_is_there_even_without_the_launcher()
+    {
+        // No network, no secrets — no launcher. The command still calls $CLAWD_HELPER.
+        _agent.Runtime = new AgentRuntimeConfig { Kind = RuntimeKinds.Command, Command = "/bin/sh" };
+
+        var request = new CommandRuntime().Prepare(Context());
+
+        request.NeedsLauncher.ShouldBeFalse();
+        request.ReadOnlyPaths.ShouldContain("/opt/clawd");
+        request.Environment["CLAWD_HELPER"].ShouldBe("/opt/clawd/ClawdDotNet");
+        request.Environment["DOTNET_ROOT"].ShouldBe("/usr/lib/dotnet");
+    }
+
     [Fact]
     public async Task A_failing_command_is_a_failed_run_with_its_reason()
     {