docs(evm): stop naming a fixed Engine API version in ExecMeta comments

Signed-off-by: elonfliter <elonfliter@outlook.com>

Author: elonfliter

execution/evm/execution.go

@@ -347,7 +347,7 @@ func (c *EngineClient) GetTxs(ctx context.Context) ([][]byte, error) {
 //
 // ExecMeta tracking (if store is configured):
 // - Checks for already-promoted blocks to enable idempotent execution
-// - Saves ExecMeta with payloadID after forkchoiceUpdatedV3 for crash recovery
+// - Saves ExecMeta with the payload ID returned by forkchoiceUpdated for crash recovery
 // - Updates ExecMeta to "promoted" after successful execution
 func (c *EngineClient) ExecuteTxs(ctx context.Context, txs [][]byte, blockHeight uint64, timestamp time.Time, prevStateRoot []byte) (execution.ExecuteResult, error) {
 

execution/evm/store.go

@@ -35,21 +35,24 @@ type ExecMeta struct {
 	Height uint64
 	// ParentHash is the EL parent block hash used for this execution
 	ParentHash []byte
-	// PayloadID is the Engine API payload ID (optional, set after forkchoiceUpdatedV3)
+	// PayloadID is the Engine API payload ID (optional, set after forkchoiceUpdated)
 	PayloadID []byte
-	// BlockHash is the EL block hash once built (set after getPayloadV4)
+	// BlockHash is the EL block hash once built (set after getPayload)
 	BlockHash []byte
 	// StateRoot is the state root from the execution payload
 	StateRoot []byte
 	// TxHash is the hash of the transaction list for sanity checks
 	TxHash []byte
 	// Timestamp is the block timestamp
 	Timestamp int64
-	// Stage indicates the current execution stage:
-	// "started" - forkchoiceUpdatedV3 called, payloadID obtained
-	// "built" - getPayloadV4 called, payload retrieved
-	// "submitted" - newPayloadV4 called, payload marked VALID
-	// "promoted" - final forkchoiceUpdatedV3 called, block is head
+	// Stage indicates the current execution stage. forkchoiceUpdated (V3/V4) and
+	// getPayload (V4/V5/V6) negotiate their version at runtime and fall back on
+	// "Unsupported fork"; newPayload is picked from the payload fields (V4 or V5)
+	// and is not retried with another version:
+	// "started" - forkchoiceUpdated returned a payload ID
+	// "built" - getPayload returned the payload
+	// "submitted" - newPayload accepted the payload as VALID
+	// "promoted" - final forkchoiceUpdated made the block the head
 	Stage string
 	// UpdatedAtUnix is the Unix timestamp when this metadata was last updated
 	UpdatedAtUnix int64