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

runbook.md

@@ -72,8 +72,8 @@ ssh <spark-user>@<spark-1-host>.local 'docker logs --tail 200 -f vllm_node'
 # Parakeet
 curl -s http://<spark-2-ip>:8000/health
 
-# Magpie (see known-issues.md)
-curl -s http://<spark-2-ip>:9000/v1/health/ready
+# Kokoro TTS (v0.14.0+)
+curl -s http://<spark-2-ip>:8880/health
 ```
 
 ## Hard reset