Deliverability QA One-time pre-flight snapshot before a send — authentication, domain/IP reputation, inbox placement, a spam-content/link/render scan, and point-in-time list hygiene — delivered as a per-qualified-item Pass/Partial/Fail/Unknown/N/A read plus an S1 authentication evidence flag. Emit the SEND S (Sender-integrity / Deliverability) dimension score only at 100% applicable coverage; otherwise return and the exact gaps. This is the pre-send snapshot, not the standing watch owned by list-hygiene-monitor. Scope guard: this skill builds and, when complete, scores SEND- , and runs the au…