- Add a shared auth-sync audit log helper that emits structured settings-sync/auth events with operation, direction, route, node IDs, and provider metadata
- Replace string-based auth sync logs in push, pull, and auth-receive routes with the new structured diagnostic event emission
- Ensure only provider names and counts are logged while filtering out credentials and other sensitive auth material
- Expand node sync route tests to capture runtime log sink events and assert structured fields plus redaction guarantees for push, pull, and receive flows
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