Make `GENESIS_BLOCK_NUMBER` public

packages/contracts-bedrock/semver-lock.json

@@ -24,7 +24,7 @@
   "src/dispute/BlockOracle.sol": "0x7e724b1ee0116dfd744f556e6237af449c2f40c6426d6f1462ae2a47589283bb",
   "src/dispute/DisputeGameFactory.sol": "0xfdfa141408d7f8de7e230ff4bef088e30d0e4d569ca743d60d292abdd21ff270",
   "src/dispute/FaultDisputeGame.sol": "0x7ac7553a47d96a4481a6b95363458bed5f160112b647829c4defc134fa178d9a",
-  "src/dispute/OutputBisectionGame.sol": "0x2415f3d3601ffce7ac92710f61180457b13c63df740ad7963a3f07b67f2b919d",
+  "src/dispute/OutputBisectionGame.sol": "0x16714c8660bf704d255ebb3fe08eb72caf4a890c43ea74fa1109df95194af760",
   "src/legacy/DeployerWhitelist.sol": "0x0a6840074734c9d167321d3299be18ef911a415e4c471fa92af7d6cfaa8336d4",
   "src/legacy/L1BlockNumber.sol": "0x20d83a636c5e2067fca8c0ed505b295174e6eddb25960d8705e6b6fea8e77fa6",
   "src/legacy/LegacyMessagePasser.sol": "0x80f355c9710af586f58cf6a86d1925e0073d1e504d0b3d814284af1bafe4dece",

packages/contracts-bedrock/src/dispute/OutputBisectionGame.sol

@@ -43,12 +43,12 @@ contract OutputBisectionGame is IOutputBisectionGame, Clone, ISemver {
     /// @notice An onchain VM that performs single instruction steps on a fault proof program trace.
     IBigStepper public immutable VM;
 
+    /// @notice The genesis block number
+    uint256 public immutable GENESIS_BLOCK_NUMBER;
+
     /// @notice The game type ID
     GameType internal immutable GAME_TYPE;
 
-    /// @notice The genesis block number
-    uint256 internal immutable GENESIS_BLOCK_NUMBER;
-
     /// @notice The global root claim's position is always at gindex 1.
     Position internal constant ROOT_POSITION = Position.wrap(1);