refactor(hooks): drop unused workspace variable

shared/hooks/scripts/validate-command-safety.sh

@@ -2,7 +2,6 @@
 set -euo pipefail
 
 command_text=${1:?Command is required}
-workspace=${2:-$PWD}
 for pattern in 'git reset --hard' 'git clean -fd' 'git clean -fx' 'rm -rf' 'Remove-Item -Recurse' 'format c:' 'del /s /q'; do
   [[ ${command_text,,} != *"${pattern,,}"* ]] || { printf 'Blocked potentially destructive command: %s\n' "$pattern" >&2; exit 1; }
 done