feat: persist workflow controls and settle stopped branches

internal/storage/mysql/workflow_instances.go

@@ -52,7 +52,7 @@ type workflowPolicy struct {
 func readWorkflowInstance(ctx context.Context, tx *sql.Tx, ns, id core.ID, lock bool) (instance.View, core.ID, error) {
 	var v instance.View
 	var gate core.ID
-	q := `SELECT i.id,i.namespace_id,i.definition_id,i.definition_version_id,v.version,i.gate_id,i.state,i.revision,i.paused,i.control_revision,i.input,i.output,COALESCE(i.business_key,''),i.deadline_at,i.cancel_requested_at,i.completed_at,i.created_at,i.updated_at
+	q := `SELECT i.id,i.namespace_id,i.definition_id,i.definition_version_id,v.version,i.gate_id,i.state,i.revision,i.paused,i.control_revision,i.input,i.output,COALESCE(i.business_key,''),i.deadline_at,i.cancel_requested_at,i.stop_kind,i.stop_requested_at,i.completed_at,i.created_at,i.updated_at
  FROM weave_instances i JOIN weave_definition_versions v ON v.namespace_id=i.namespace_id AND v.definition_id=i.definition_id AND v.id=i.definition_version_id
  JOIN weave_definitions d ON d.namespace_id=i.namespace_id AND d.id=i.definition_id
  JOIN pulse_execution_gates g ON g.namespace_id=i.namespace_id AND g.id=i.gate_id
@@ -61,7 +61,7 @@ func readWorkflowInstance(ctx context.Context, tx *sql.Tx, ns, id core.ID, lock
 		q += ` FOR SHARE`
 	}
 	var input, output []byte
-	err := tx.QueryRowContext(ctx, q, ns, id).Scan(&v.ID, &v.NamespaceID, &v.DefinitionID, &v.DefinitionVersionID, &v.Version, &gate, &v.State, &v.Revision, &v.Paused, &v.ControlRevision, &input, &output, &v.BusinessKey, &v.DeadlineAt, &v.CancelRequestedAt, &v.CompletedAt, &v.CreatedAt, &v.UpdatedAt)
+	err := tx.QueryRowContext(ctx, q, ns, id).Scan(&v.ID, &v.NamespaceID, &v.DefinitionID, &v.DefinitionVersionID, &v.Version, &gate, &v.State, &v.Revision, &v.Paused, &v.ControlRevision, &input, &output, &v.BusinessKey, &v.DeadlineAt, &v.CancelRequestedAt, &v.StopKind, &v.StopRequestedAt, &v.CompletedAt, &v.CreatedAt, &v.UpdatedAt)
 	v.Input, v.Output = input, output
 	if errors.Is(err, sql.ErrNoRows) {
 		err = fault.NotFound