refactor: remove rollbackAll from public API, add RollbackConfig to instance options

- Remove step.rollbackAll() from WorkflowStep (now internal to engine)
- Remove RollbackAllOptions type (no longer public)
- Add RollbackConfig type for auto-rollback configuration
- Add rollback option to WorkflowInstanceCreateOptions

Rollback is now triggered automatically when workflow throws and
rollback config is enabled at instance creation.

Author: dmmulroy

types/defines/rpc.d.ts

@@ -321,11 +321,6 @@ declare namespace CloudflareWorkersModule {
     undoConfig?: WorkflowStepConfig;
   };
 
-  export type RollbackAllOptions = {
-    /** If true, continue executing remaining undos after a failure and throw AggregateError at end. Default: false */
-    continueOnError?: boolean;
-  };
-
   export abstract class WorkflowStep {
     do<T extends Rpc.Serializable<T>>(
       name: string,
@@ -350,7 +345,6 @@ declare namespace CloudflareWorkersModule {
       handler: RollbackHandler<T>,
       config?: RollbackStepConfig
     ): Promise<T>;
-    rollbackAll(error?: unknown, options?: RollbackAllOptions): Promise<void>;
   }
 
   export abstract class WorkflowEntrypoint<

types/defines/workflows.d.ts

@@ -51,6 +51,11 @@ type WorkflowSleepDuration =
 
 type WorkflowRetentionDuration = WorkflowSleepDuration;
 
+type RollbackConfig = {
+  /** If true, continue executing remaining undos after undo failure. Default: false */
+  continueOnError?: boolean;
+};
+
 interface WorkflowInstanceCreateOptions<PARAMS = unknown> {
   /**
    * An id for your Workflow instance. Must be unique within the Workflow.
@@ -68,6 +73,11 @@ interface WorkflowInstanceCreateOptions<PARAMS = unknown> {
     successRetention?: WorkflowRetentionDuration;
     errorRetention?: WorkflowRetentionDuration;
   };
+  /**
+   * Enable automatic rollback on uncaught workflow errors.
+   * When enabled, registered undo handlers execute in LIFO order when the workflow throws.
+   */
+  rollback?: RollbackConfig;
 }
 
 type InstanceStatus = {