(CAT-2609) Remove unreliable grep/sed JSON fallback from _parse_input.sh

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

Author: david22swan

.claude/hooks/_parse_input.sh

@@ -9,8 +9,6 @@ if command -v jq >/dev/null 2>&1; then
   cmd=$(printf '%s' "$input" | jq -r '.tool_input.command // ""')
 elif command -v python3 >/dev/null 2>&1; then
   cmd=$(printf '%s' "$input" | python3 -c "import sys,json; print(json.load(sys.stdin).get('tool_input',{}).get('command',''))" 2>/dev/null || echo "")
-elif command -v grep >/dev/null 2>&1 && command -v sed >/dev/null 2>&1; then
-  cmd=$(printf '%s' "$input" | grep -o '"command"[[:space:]]*:[[:space:]]*"[^"]*"' | sed 's/^"command"[[:space:]]*:[[:space:]]*"//;s/"$//')
 else
   exit 0
 fi