Remove extra JSON.stringify in event bus publisher

[coderabbitai]

The event bus publisher has an extra JSON.stringify statement that causes consumers to perform double JSON.parse. This affects multiple components including the VC Engine library and other engines.

References

• PR discussion: Ingest space 63/ingest knowledge base virtual-contributor-ingest-space#64 (comment)
• Code location:

  server/src/services/infrastructure/event-bus/publisher.ts

  Line 22 in ea039ae

  JSON.stringify({ type: event.constructor.name, ...event })

Impact

• Requires double JSON.parse in consumers
• Affects VC Engine library and other engines
• Makes the code harder to understand and maintain

Required Changes

1. Remove the extra JSON.stringify in the event bus publisher
2. Update VC Engine library to handle the change
3. Update other engines to handle the change