v0.13.0:4 - redaction gateway, embeddings proxy, expanded audio API

- Add redaction gateway (redaction_gateway.py, redaction/ scrub + tests)
- Add embeddings proxy and spark_embed service (Dockerfile + main.py)
- Expand audio_proxy with speaker-aware handling; deep_health/health/server updates
- Package: configureSparks action + sparkConfig model updates, manifest/main wiring
- Docs: AUDIO_API, EMBEDDINGS, REDACTION_GATEWAY; HANDOFF and runbook/known-issues refresh

image/app/custom_services.py

@@ -4,8 +4,8 @@ Format:
     custom:
       - key: my-riva
         kind: stt
-        host: <spark-2-ip>
-        user: <spark-user>
+        host: <spark-host-or-ip>
+        user: <ssh-user>
         container: riva-asr
         port: 8001
         health_path: /health