Classify recovery setup failures by their actual cause

recovery.go

@@ -42,6 +42,9 @@ type PublicationReconciliationResult struct {
 // Kind includes missing_evidence, invalid_evidence, canceled, endpoint_changed,
 // transport_configuration, remote_observation, inconsistent_observation,
 // record_format, record_read, record_write, and storage_enumeration.
+// endpoint_changed identifies a confirmed URL-resolution mismatch;
+// transport_configuration identifies configuration-read or resolution failures,
+// including when the original remote name is absent.
 type PublicationRecoveryError struct {
 	Kind          string
 	RecordPath    string   // selected or affected record path, when applicable.