chore: phase 3 code quality — pipeline prefixes, godoc baseline

Co-authored-by: Cursor <[email protected]>

internal/pipeline/refresh.go

@@ -52,7 +52,7 @@ func RefreshModuleIngest(ctx context.Context, st store.Backend, hc *http.Client,
 		return err
 	}
 	if !mod.Enabled {
-		return fmt.Errorf("module disabled")
+		return fmt.Errorf("pipeline: module disabled")
 	}
 
 	var prior []store.PrefixRow
@@ -185,7 +185,7 @@ func collectModulePrefixRows(ctx context.Context, st store.Backend, hc *http.Cli
 		}
 		return collectDomainPrefixRows(ctx, hc, mod, profiles, policy, entries)
 	default:
-		return nil, fmt.Errorf("unknown module type %q", mod.Type)
+		return nil, fmt.Errorf("pipeline: unknown module type %q", mod.Type)
 	}
 }