Wire shared EventDeduplicator across all ingestion paths (JSONL tailer,
OTLP/gRPC receiver, OTLP/HTTP receiver) so duplicate events from dual
ingestion are silently dropped on (session_id, worker_id, sequence).
Also adds docs/needle-exporter-wiring.md (OTLP configuration guide for
NEEDLE), SpanDag React component, EventFilter.eventType field, and
various test/layout fixes.
Co-Authored-By: Claude Opus 4.7 <noreply@anthropic.com>
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