Fix JSON circular reference serialization and use PayloadCMS generated types

- Replace duplicate type definitions with PayloadCMS generated types
- Fix workflow context serialization with safeSerialize() method
- Resolve type mismatches (id: string vs number)
- Update all imports to use PayloadWorkflow type
- Ensure workflow runs are created successfully without serialization errors

🤖 Generated with [Claude Code](https://claude.ai/code)

Co-Authored-By: Claude <noreply@anthropic.com>

src/plugin/cron-scheduler.ts

@@ -2,7 +2,7 @@ import type {Config, Payload, TaskConfig} from 'payload'
 
 import cron from 'node-cron'
 
-import {type Workflow, WorkflowExecutor} from '../core/workflow-executor.js'
+import {type PayloadWorkflow, WorkflowExecutor} from '../core/workflow-executor.js'
 import {getConfigLogger} from './logger.js'
 
 /**
@@ -101,7 +101,7 @@ export function generateCronTasks(config: Config): void {
         }
 
         // Execute the workflow
-        await executor.execute(workflow as Workflow, context, req)
+        await executor.execute(workflow as PayloadWorkflow, context, req)
 
         // Re-queue the job for the next scheduled execution if cronExpression is provided
         if (cronExpression) {

src/plugin/init-global-hooks.ts

@@ -1,7 +1,7 @@
 import type { Payload, PayloadRequest } from "payload"
 import type { Logger } from "pino"
 
-import type { WorkflowExecutor, Workflow } from "../core/workflow-executor.js"
+import type { WorkflowExecutor, PayloadWorkflow } from "../core/workflow-executor.js"
 
 export function initGlobalHooks(payload: Payload, logger: Payload['logger'], executor: WorkflowExecutor) {
   // Get all globals from the config
@@ -100,7 +100,7 @@ async function executeTriggeredGlobalWorkflows(
       }
 
       // Execute the workflow
-      await executor.execute(workflow as Workflow, context, req)
+      await executor.execute(workflow as PayloadWorkflow, context, req)
     }
   } catch (error) {
     logger.error({

src/plugin/init-webhook.ts

@@ -1,6 +1,6 @@
 import type {Config, PayloadRequest} from 'payload'
 
-import {type Workflow, WorkflowExecutor} from '../core/workflow-executor.js'
+import {type PayloadWorkflow, WorkflowExecutor} from '../core/workflow-executor.js'
 import {getConfigLogger, initializeLogger} from './logger.js'
 
 export function initWebhookEndpoint(config: Config, webhookPrefix = 'webhook'): void {
@@ -110,7 +110,7 @@ export function initWebhookEndpoint(config: Config, webhookPrefix = 'webhook'):
             }
 
             // Execute the workflow
-            await executor.execute(workflow as Workflow, context, req)
+            await executor.execute(workflow as PayloadWorkflow, context, req)
 
             return { status: 'triggered', workflowId: workflow.id }
           } catch (error) {