Reject unversioned party documents

internal/config/party_resolution.go

@@ -32,19 +32,15 @@ func resolvePartyInput(input ResolvedInputFile) (ResolvedParty, error) {
 	if err != nil {
 		return ResolvedParty{}, fmt.Errorf("parse party input %q: %w", path, err)
 	}
-	resolved := ResolvedParty{
-		Mode: document.Mode,
+	return ResolvedParty{
+		Mode: PartyModeCanonical,
 		Source: PartySource{
 			Path:       path,
 			ConfigPath: configPath,
 			Source:     input.Source,
 		},
 		Canonical: document.Canonical,
-	}
-	if document.IsCanonical() {
-		return resolved, nil
-	}
-	return resolveLegacyParty(resolved)
+	}, nil
 }
 
 func campaignPartyInput(campaignPath string, campaign *CampaignConfig) (ResolvedInputFile, error) {