Add TUI kanban board, review workflow, and new task statuses

Replace task statuses (pending/running/succeeded/failed/cancelled) with
a kanban workflow: todo → in_progress → in_review → done/wontdo.

When a non-review agent task completes, the API auto-creates a child
review task and moves the parent to in_review. Only humans can move
tasks from in_review to done/wontdo via the TUI.

New components:
- cmd/tui: bubbletea kanban board with $EDITOR integration
- POST /api/v1/tasks/{id}/complete: agent completion callback
- Operator --api-url flag for completion callbacks
- ProviderQueue sets tasks to in_progress on pickup
- AgentTask reconciler calls /complete on job finish

internal/controller/setup.go

@@ -4,7 +4,11 @@ import (
 	ctrl "sigs.k8s.io/controller-runtime"
 )
 
-func SetupAll(mgr ctrl.Manager) error {
+type SetupOptions struct {
+	APIURL string
+}
+
+func SetupAll(mgr ctrl.Manager, opts SetupOptions) error {
 	if err := (&AgentPoolReconciler{
 		Client: mgr.GetClient(),
 		Scheme: mgr.GetScheme(),
@@ -15,6 +19,7 @@ func SetupAll(mgr ctrl.Manager) error {
 	if err := (&AgentTaskReconciler{
 		Client: mgr.GetClient(),
 		Scheme: mgr.GetScheme(),
+		APIURL: opts.APIURL,
 	}).SetupWithManager(mgr); err != nil {
 		return err
 	}