STT Service v2.2.0 - ADR-004 Fase 2 + ADR-006 Fase 4 Features: - Server-side speaker resolution (privacy: embeddings not on network) - SepFormer integration for speech separation - ProcessingMode enum (PARALLEL/SEQUENTIAL/HYBRID) - OverlapHandling enum (DOMINANT/SPLIT/SEPARATE) - Prometheus metrics for DER, latency, throughput - Sliding window support (10s/5s/50% overlap) Backward Compatible: - TranscribeFile RPC (deprecated, will be removed in v3.0.0) - known_speakers field (deprecated, use user_id instead) Quality Gates: - QG-10: Embeddings NOT transferred over network ✅