fix(go): retry rejected prev_chain_hash within a bounded budget and serialize chain-state updates; release 2.0.1

Claude-Session: https://claude.ai/code/session_01QoUjdc7HGKTsgj5GhG8HvF

cmd/elydora/main.go

@@ -11,7 +11,7 @@ import (
 	"github.com/Elydora-Infrastructure/Elydora-Go-SDK/v2/cmd/elydora/plugins"
 )
 
-const version = "2.0.0"
+const version = "2.0.1"
 
 func main() {
 	if len(os.Args) < 2 {