Add task sidebar workflow

internal/app/session.go

@@ -201,6 +201,7 @@ type SpawnSpec struct {
 	WorkDir   string
 	Name      string
 	ParentID  string
+	TaskID    string
 	PresetRef string
 	Identity  string // pre-minted; otherwise the constructor mints one for agents
 	// CleanupPaths are owned runtime files/dirs removed when the child exits
@@ -235,7 +236,7 @@ func (s *Session) Spawn(spec SpawnSpec, cols, rows uint16) (*Child, error) {
 	}
 	s.mu.Unlock()
 
-	c := newChildEntry(id, spec.Name, spec.Kind, spec.Argv, spec.Env, spec.ParentID, spec.WorkDir, spec.PresetRef)
+	c := newChildEntry(id, spec.Name, spec.Kind, spec.Argv, spec.Env, spec.ParentID, spec.TaskID, spec.WorkDir, spec.PresetRef)
 	if spec.Identity != "" {
 		c.Identity = spec.Identity
 	}