Users can set metadata.max_budget_alert_emails as a JSON map of threshold
percentages to email recipients on virtual keys. When configured, the email
handler loops over each threshold, checks per-threshold dedup cache, and
sends to the configured recipients (auto-including the key owner's email).
When no map is set, the existing single 80% threshold behavior is preserved
unchanged. Teams support is out of scope for this v0.
Ryan Crabbe
779a9fab8e