Signal stats

curl -X GET https://app.dacard.ai/api/signals/stats \
  -H "Authorization: Bearer $DACARD_API_KEY"

{
  "totalSignals": 12_400,
  "byProvider": {
    "github": 8_200,
    "linear": 4_200
  },
  "byDimension": {
    "decision_quality": 312,
    "delivery_velocity": 240
  },
  "lastIngestedAt": "2026-05-06T12:00:00Z",
  "coveragePct": 0.78
}