fix: restore Testnet deployer role

[JOY (JOY)]

Summary

• restore the designated 9999 hot deployer for the ENSv2 baseline deployment
• retain the Ledger address as the final protocol owner and beneficiary
• align the Testnet fixture with the guarded deployment script

Validation

• C:\Users\JOY\.foundry\bin\forge.exe buildn- C:\\Users\\JOY\\.foundry\\bin\\forge.exe test --match-path test/unit/testnet/WrappedDOS.t.sol -vvn-
  px --no-install solgrid check --config solgrid.test.toml script/foundry/DeployDOSTestnet.s.sol test/unit/testnet/WrappedDOS.t.sol`n

[gemini-code-assist]

Code Review

This pull request updates the expected testnet deployer address from 0x310Bc061214ee89aF5CfB28a6ebF96c5436fa3CD to 0x99999e454138f6be73E2bE82c890bc5765749999 across the Solidity deployment script, the PowerShell invocation script, and the unit tests. There are no review comments, and I have no feedback to provide.