Hugo Nijhuis 97ff1c3346 Add event metadata support for distributed tracing and auditing ...

- Add Metadata field (map[string]string) to Event struct with omitempty
- Add helper methods for common metadata: SetCorrelationID/GetCorrelationID,
  SetCausationID/GetCausationID, SetUserID/GetUserID, SetTraceID/GetTraceID,
  SetSpanID/GetSpanID
- Add WithMetadataFrom helper for copying metadata between events
- Add metadata key constants for standard fields
- Add comprehensive unit tests for metadata serialization and helpers
- Add store tests verifying metadata persistence

Closes #7

Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>

2026-01-09 17:53:05 +01:00

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