feat(ui): WorkerClient planning-session methods

src/ClaudeDo.Ui/Services/PlanningDtos.cs

@@ -0,0 +1,18 @@
+namespace ClaudeDo.Ui.Services;
+
+public sealed record PlanningSessionFilesDto(
+    string SessionDirectory,
+    string McpConfigPath,
+    string SystemPromptPath,
+    string InitialPromptPath);
+
+public sealed record PlanningSessionStartInfo(
+    string ParentTaskId,
+    string WorkingDir,
+    PlanningSessionFilesDto Files);
+
+public sealed record PlanningSessionResumeInfo(
+    string ParentTaskId,
+    string WorkingDir,
+    string ClaudeSessionId,
+    string McpConfigPath);