Email send capacity for this shop

Today's email send capacity for a single shop — the email twin of GET /automations/outreach-capacity — so a consumer can pre-check before queuing email outreach and schedule the remainder for tomorrow.

emails_sent_today counts today's sends; daily_limit is the denominator the portal's daily-send bar uses, derived from the shop's effective plan entitlement.

tier_limits is that entitlement in full (default / minimum / maximum, Extra Limits grants applied). Note the enforced cap is per email automation, stored on the automation itself and clamped into this range when it is written — so a shop running several automations can exceed daily_limit in aggregate. A null field means the tier expresses no such limit, not zero.

Requires a single shop.