feat(worker): resume a task's claude session in a terminal

tests/ClaudeDo.Worker.Tests/Planning/WindowsTerminalLauncherTests.cs

@@ -69,4 +69,27 @@ public sealed class WindowsTerminalLauncherTests
         // The legacy env-var indirection is gone.
         Assert.DoesNotContain("CLAUDEDO_LAUNCH_PROMPT", command);
     }
+
+    [Fact]
+    public void BuildResumeCommand_ResumesSessionSingleQuoted()
+    {
+        var command = WindowsTerminalLauncher.BuildResumeCommand("claude.exe", "sess-42");
+
+        Assert.Contains("--resume", command);
+        // The session id is single-quoted so ';' and friends pass through untouched.
+        Assert.Contains("'--resume' 'sess-42'", command);
+        // A plain resume drives the real interactive TUI — no planning-only flags.
+        Assert.DoesNotContain("--permission-mode", command);
+        Assert.DoesNotContain("--append-system-prompt-file", command);
+    }
+
+    [Fact]
+    public async Task LaunchResumeAsync_WorkingDirMissing_Throws()
+    {
+        var sut = new WindowsTerminalLauncher(wtPath: "wt", claudePath: "claude");
+        var missing = Path.Combine(Path.GetTempPath(), "nonexistent_" + Guid.NewGuid());
+        var ex = await Assert.ThrowsAsync<TerminalLaunchException>(() =>
+            sut.LaunchResumeAsync(missing, "sess-1", CancellationToken.None));
+        Assert.Contains("Working directory", ex.Message);
+    }
 }