chore: additional lint fixes suggested by code review

op-challenger/scripts/alphabet/charlie.sh

@@ -32,7 +32,7 @@ cleanup(){
   --datadir "${DATADIR}" \
   --game-factory-address "$DISPUTE_GAME_PROXY" \
   --game-allowlist "$FAULT_GAME_ADDRESS" \
-  --private-key $CHARLIE_KEY \
+  --private-key "$CHARLIE_KEY" \
   --num-confirmations 1 \
   --metrics.enabled --metrics.port=7304 \
   --pprof.enabled --pprof.port=6064 \

op-challenger/scripts/alphabet/init_game.sh

@@ -45,10 +45,10 @@ echo " - Balance: $(cast balance 0xf39Fd6e51aad88F6F4ce6aB8827279cffFb92266)"
 echo "----------------------------------------------------------------"
 
 echo "Funding Charlie"
-cast send $CHARLIE_ADDRESS --value 5ether --private-key $DEVNET_SPONSOR
+cast send "$CHARLIE_ADDRESS" --value 5ether --private-key "$DEVNET_SPONSOR"
 
 echo "Funding Mallory"
-cast send $MALLORY_ADDRESS --value 5ether --private-key $DEVNET_SPONSOR
+cast send "$MALLORY_ADDRESS" --value 5ether --private-key "$DEVNET_SPONSOR"
 
 # Loop and wait until there are at least 2 outputs in the l2 output oracle
 echo "Waiting until 2 output proposals are in the l2 output oracle..."

op-challenger/scripts/alphabet/mallory.sh

@@ -32,7 +32,7 @@ cleanup(){
   --datadir "${DATADIR}" \
   --game-factory-address "$DISPUTE_GAME_PROXY" \
   --game-allowlist "$FAULT_GAME_ADDRESS" \
-  --private-key $MALLORY_KEY \
+  --private-key "$MALLORY_KEY" \
   --num-confirmations 1 \
   --metrics.enabled --metrics.port=7305 \
   --pprof.enabled --pprof.port=6065 \

op-challenger/scripts/visualize.sh

@@ -5,7 +5,7 @@ set -euo pipefail
 RPC="${1:?Must specify RPC address}"
 FAULT_GAME_ADDRESS="${2:?Must specify game address}"
 
-DIR=$(cd $(dirname "${BASH_SOURCE[0]}") && pwd)
+DIR="$(cd "$(dirname "${BASH_SOURCE[0]}")" && pwd)"
 DIR=$(echo "${DIR%/*/*}")
 cd "$DIR"/packages/contracts-bedrock
 
@@ -13,4 +13,4 @@ forge script scripts/FaultDisputeGameViz.s.sol \
   --sig "remote(address)" "$FAULT_GAME_ADDRESS" \
   --fork-url "$RPC"
 
-mv dispute_game.svg "$dir"
+mv dispute_game.svg "$DIR"