Standardize deployment env and deployer handling

scripts/deployment/run-e2e-trustless-live-test.sh

@@ -45,8 +45,9 @@ export RPC_URL_138="${RPC_URL_138:-${CHAIN_138_RPC_URL:-}}"
 export ETHEREUM_MAINNET_RPC="${ETHEREUM_MAINNET_RPC:-}"
 
 # Require key and RPCs so we fail with a clear message instead of "Invalid params"
-[[ -n "${PRIVATE_KEY:-}" ]] || { echo "PRIVATE_KEY not set in .env"; exit 1; }
-RECIPIENT=$(cast wallet address "$PRIVATE_KEY")
+require_private_key_env || exit 1
+RECIPIENT="$(derive_deployer_address || true)"
+[[ -n "$RECIPIENT" ]] || { echo "ERROR: Could not derive DEPLOYER_ADDRESS from PRIVATE_KEY." >&2; exit 1; }
 NONCE=$(cast keccak "e2e-$(date +%s)" | tr -d '\n\r')
 # 0.001 ether in wei
 AMOUNT_WEI="${AMOUNT_WEI:-1000000000000000}"