Monthly API Quota

• Default: 100 calls per calendar month (UTC YYYY-MM) per active subscription

• Anchor: subscription.id when an active subscription exists, otherwise organization.id; renewal mid-month resets usage

• Counting: only 2xx responses increment; 4xx/5xx do not count (accepted drift via waitUntil)

• On exceed: HTTP 429 with ERR_PUBLIC_API_QUOTA_EXCEEDED, Retry-After (seconds to next month), and meta { quota, used, period, resetsAt }