Classify invalid delivery destinations during preflight

internal/forge/forge.go

@@ -66,11 +66,12 @@ type Asset struct {
 	Handle   any
 }
 
-// PreflightFailureKind classifies a failure to verify credentials or access to
-// a delivery destination.
+// PreflightFailureKind classifies a failure to verify destination settings,
+// credentials, or repository access.
 type PreflightFailureKind string
 
 const (
+	PreflightInvalidDestination      PreflightFailureKind = "invalid_destination"
 	PreflightMissingCredential       PreflightFailureKind = "missing_credential"
 	PreflightInvalidCredential       PreflightFailureKind = "invalid_credential"
 	PreflightInsufficientPermissions PreflightFailureKind = "insufficient_permissions"

internal/gitea/backend.go

@@ -50,7 +50,7 @@ func (b *Backend) Preflight(ctx context.Context) error {
 	}
 	base, apiRoot, err := b.destinationAPI("preflight repository access")
 	if err != nil {
-		return err
+		return &forge.PreflightFailure{Kind: forge.PreflightInvalidDestination, Err: err}
 	}
 	client := b.client.httpClient()
 	var resolved repositoryResponse