Current rolling AI capacity

Returns a coarse state and a renewal date — deliberately never a balance, a count, or a percentage. Metered AI actions (chat, enrichment runs, and contact finds) draw against the trailing 168-hour allowance on the free tier. Each action returns exactly seven days after it was reserved; there is no calendar reset. Briefs are recorded but unmetered because follow slots already bound them. 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,
    "modules": {
      "internal": true,
      "enabled": [
        "string"
      ]
    }
  }
}

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

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