Add task sidebar workflow

internal/mcp/mcp_test.go

@@ -108,10 +108,17 @@ type blockingToolHost struct {
 	waitEntered chan struct{}
 	waitRelease chan struct{}
 	waitOnce    sync.Once
+	task        TaskInfo
 }
 
 func (h *blockingToolHost) ResolveCallerIdentity(identity string) string { return "caller-" + identity }
 func (h *blockingToolHost) CallerRole(string) CallerRole                 { return RoleOrchestrator }
+func (h *blockingToolHost) CallerTask(string) (TaskInfo, bool) {
+	if h.task.ID == "" {
+		return TaskInfo{}, false
+	}
+	return h.task, true
+}
 func (h *blockingToolHost) SpawnAgent(string, SpawnAgentArgs) (ProcessInfo, error) {
 	return ProcessInfo{}, nil
 }
@@ -186,5 +193,8 @@ func (h *blockingToolHost) ScratchpadWrite(string, string, string) (string, erro
 }
 func (h *blockingToolHost) ScratchpadAppend(string, string) error { return nil }
 func (h *blockingToolHost) ScratchpadDelete(string) error         { return nil }
-func (h *blockingToolHost) WhoAmI(string, bool) WhoAmI            { return WhoAmI{} }
-func (h *blockingToolHost) Help(string, string) HelpResponse      { return HelpResponse{} }
+func (h *blockingToolHost) RegisterTaskWorktree(string, TaskRegisterWorktreeArgs) (TaskInfo, error) {
+	return TaskInfo{}, nil
+}
+func (h *blockingToolHost) WhoAmI(string, bool) WhoAmI       { return WhoAmI{} }
+func (h *blockingToolHost) Help(string, string) HelpResponse { return HelpResponse{} }