Metrics & Health - Illocution Insights API

`GET /metrics`

Lightweight counters to feed dashboards. Example:

{
  "events": {
    "status": 45,
    "final_transcript": 12,
    "emotion": 12,
    "summary_update": 1
  },
  "agent_latency_ms": {
    "utterance": 215.34
  }
}

`GET /health`

Returns { "status": "ok" }.