fix: address key rotation review comments

Author: randygrok

docs/reference/interfaces/executor.md

@@ -123,12 +123,10 @@ GetExecutionInfo(ctx context.Context) (ExecutionInfo, error)
 
 ```go
 type ExecutionInfo struct {
-    MaxGas uint64
+    MaxGas uint64  // Maximum gas per block (0 = no gas-based limiting)
 }
 ```
 
-- `MaxGas` - Maximum gas per block (0 = no gas-based limiting)
-
 ### FilterTxs
 
 Validates and filters transactions for block inclusion.

execution/grpc/proto/evnode/v1/execution.proto

@@ -114,9 +114,6 @@ message GetExecutionInfoRequest {}
 
 // GetExecutionInfoResponse contains execution layer parameters
 message GetExecutionInfoResponse {
-  reserved 2;
-  reserved "next_proposer_address";
-
   // Maximum gas allowed for transactions in a block
   // For non-gas-based execution layers, this should be 0
   uint64 max_gas = 1;

execution/grpc/types/pb/evnode/v1/execution.pb.go

@@ -505,6 +505,8 @@ func (c *Config) Validate() error {
 		return fmt.Errorf("promotable mode cannot be combined with light node mode")
 	}
 
+	// Promotable mode and Raft both control leader/follower role switching.
+	// Combining them needs a composed elector that gates Raft leadership on the execution-selected proposer.
 	if c.Node.Promotable && c.Raft.Enable {
 		return fmt.Errorf("promotable mode cannot be combined with Raft consensus")
 	}

pkg/config/config.go

@@ -65,11 +65,11 @@ type State struct {
 	NextProposerAddress []byte
 }
 
-func (s *State) NextState(header Header, stateRoot []byte, nextProposerAddress ...[]byte) (State, error) {
+func (s *State) NextState(header Header, stateRoot []byte, nextProposerAddress []byte) (State, error) {
 	height := header.Height()
 	nextProposer := s.NextProposerAddress
-	if len(nextProposerAddress) > 0 && len(nextProposerAddress[0]) > 0 {
-		nextProposer = nextProposerAddress[0]
+	if len(nextProposerAddress) > 0 {
+		nextProposer = nextProposerAddress
 	}
 	if len(nextProposer) == 0 {
 		nextProposer = header.ProposerAddress