Seed Test Connection

Verify a live connection end to end with one synthetic seed lead.

Server-side by design: access tokens are EncryptedText and never leave the server, so the whole deliver → read-back → delete cycle runs here. Delivery goes through the real adapter (ADAPTERS[provider].deliver_one) but writes NO CrmDelivery / CrmPublishJob rows — this is a probe, not a delivery. Returns the exhaustive checklist ({check, expected, actual, ok} per field/tag/placement/link), passed, distilled mismatches, the discoveries map (candidate payload variants tried in-run, with the empirically working one named per construct), and the cleanup report — deletion failures surface as leftover_records.