How much AI capacity is left this week

Returns a coarse state and a renewal date — deliberately never a balance, a count, or a percentage. AI actions (chat, enrichment runs, briefs, contact finds) draw against a weekly allowance on the free tier; enterprise and internal are unmetered and report `metered: false`. Clients should show nothing while `comfortable`, a quiet notice at `low`, and the upgrade path at `exhausted`. Requests refused for want of allowance return 402 from the acting endpoint, not from here.

curl -X GET "https://loading/api/v1/allowance"

{
  "data": {
    "state": "comfortable",
    "renews_at": "2019-08-24T14:15:22Z",
    "metered": true
  }
}

{
  "error": "string",
  "message": "string",
  "statusCode": -9007199254740991
}

{
  "error": "string",
  "message": "string",
  "statusCode": -9007199254740991
}