G findings: distribution and gitea's package registry delete their old finding keys once at start

Builds: design 47 G A-31, A-14, A-22

Claude-Session: https://claude.ai/code/session_01JG73KEq4zoDfM9WtYpcQgZ

modules/distribution/cmd/distribution-tools/main.go

@@ -517,6 +517,10 @@ func main() {
 	// the runtime answers the writer's subscription only once Serve has its channel
 	go func() {
 		<-stdio.Served()
+		// the keys of the older form end in no kind the writer owns, so it does not clear them (A-31)
+		if err := holder.DeleteOldFindings(stdio.State("findings"), holder.Self, holder.TransferFindingKinds); err != nil {
+			logf("the old findings are not deleted: %v", err)
+		}
 		if err := w.Start(context.Background()); err != nil {
 			logf("%v", err)
 			os.Exit(1)

modules/distribution/cmd/distribution/main.go

@@ -74,6 +74,10 @@ func run(ctx context.Context, getenv func(string) string) error {
 			return err
 		}
 		findings.Writer = w
+		// the keys of the older form end in no kind the writer owns, so it does not clear them (A-31)
+		if err := holder.DeleteOldFindings(calls.State("findings"), holder.Self, holder.DriverFindingKinds); err != nil {
+			logger.Printf("the old findings are not deleted: %v", err)
+		}
 		if err := w.Start(ctx); err != nil {
 			return err
 		}