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>

dev/app/test-trigger/route.ts

@@ -0,0 +1,122 @@
+import { NextResponse } from 'next/server'
+import { getPayload } from 'payload'
+import config from '../../payload.config'
+
+export async function GET() {
+  console.log('Starting workflow trigger test...')
+  
+  // Get payload instance
+  const payload = await getPayload({ config })
+  
+  try {
+    // Create a test user
+    const user = await payload.create({
+      collection: 'users',
+      data: {
+        email: `test-${Date.now()}@example.com`,
+        password: 'password123'
+      }
+    })
+    
+    console.log('Created test user:', user.id)
+    
+    // Create a workflow with collection trigger
+    const workflow = await payload.create({
+      collection: 'workflows',
+      data: {
+        name: 'Test Post Creation Workflow',
+        description: 'Triggers when a post is created',
+        triggers: [
+          {
+            type: 'collection-trigger',
+            collectionSlug: 'posts',
+            operation: 'create'
+          }
+        ],
+        steps: [
+          {
+            name: 'log-post',
+            taskSlug: 'http-request-step',
+            input: JSON.stringify({
+              url: 'https://httpbin.org/post',
+              method: 'POST',
+              headers: {
+                'Content-Type': 'application/json'
+              },
+              body: {
+                message: 'Post created',
+                postId: '$.trigger.doc.id',
+                postTitle: '$.trigger.doc.title'
+              }
+            })
+          }
+        ]
+      },
+      user: user.id
+    })
+    
+    console.log('Created workflow:', workflow.id, workflow.name)
+    console.log('Workflow triggers:', JSON.stringify(workflow.triggers, null, 2))
+    
+    // Create a post to trigger the workflow
+    console.log('Creating post to trigger workflow...')
+    const post = await payload.create({
+      collection: 'posts',
+      data: {
+        title: 'Test Post',
+        content: 'This should trigger the workflow',
+        _status: 'published'
+      },
+      user: user.id
+    })
+    
+    console.log('Created post:', post.id)
+    
+    // Wait a bit for workflow to execute
+    await new Promise(resolve => setTimeout(resolve, 3000))
+    
+    // Check for workflow runs
+    const runs = await payload.find({
+      collection: 'workflow-runs',
+      where: {
+        workflow: {
+          equals: workflow.id
+        }
+      }
+    })
+    
+    console.log('Workflow runs found:', runs.totalDocs)
+    
+    const result = {
+      success: runs.totalDocs > 0,
+      workflowId: workflow.id,
+      postId: post.id,
+      runsFound: runs.totalDocs,
+      runs: runs.docs.map(r => ({
+        id: r.id,
+        status: r.status,
+        triggeredBy: r.triggeredBy,
+        startedAt: r.startedAt,
+        completedAt: r.completedAt,
+        error: r.error
+      }))
+    }
+    
+    if (runs.totalDocs > 0) {
+      console.log('✅ SUCCESS: Workflow was triggered!')
+      console.log('Run status:', runs.docs[0].status)
+      console.log('Run context:', JSON.stringify(runs.docs[0].context, null, 2))
+    } else {
+      console.log('❌ FAILURE: Workflow was not triggered')
+    }
+    
+    return NextResponse.json(result)
+    
+  } catch (error) {
+    console.error('Test failed:', error)
+    return NextResponse.json({ 
+      success: false, 
+      error: error instanceof Error ? error.message : 'Unknown error' 
+    }, { status: 500 })
+  }
+}