[#488] reputation/router: Add commentaries and TODO

Signed-off-by: Pavel Karpy <carpawell@nspcc.ru>

cmd/neofs-node/reputation/intermediate/remote.go

@@ -57,6 +57,7 @@ type TrustWriterProvider struct {
 func (twp *TrustWriterProvider) InitWriter(ctx reputationcommon.Context) (reputationcommon.Writer, error) {
 	eiContext, ok := ctx.(eigentrustcalc.Context)
 	if !ok {
+		// TODO: think if this can be done without such limitation
 		panic(ErrIncorrectContextPanicMsg)
 	}