Add EventPublisherHelper to eliminate code duplication

[jhw-db]

Create EventPublisherHelper utility to centralize event publishing logic.

Current Issue:

• Event publishing code duplicated in every coordinator
• Inconsistent event publishing patterns

Proposed Solution:

• Create EventPublisherHelper class
• Centralize event publishing logic
• Provide consistent interface

Benefits:

• DRY principle
• Consistent event publishing
• Reduced coordinator complexity