[S7] Add structured logging with correlation IDs

[krakenhavoc]

Description

Ensure all GitHub integration services use structured logging with correlation IDs for request tracing.

Implementation

• Generate correlation ID at webhook receipt (use GitHub delivery ID)
• Pass correlation ID through BullMQ job data
• Include correlation ID in all log entries across the processing pipeline
• Include in reconciliation log records
• Include in check run output for debugging

Acceptance Criteria

• Every log entry includes correlation ID
• Correlation ID traces webhook → queue → reconcile → deploy
• Logs are structured (JSON format in production)
• No secrets in log output (audit all log statements)