fix: correct argv index in denial block for node -e scripts

For `node -e "..." arg`, process.argv[1] is empty — the actual
argument lands at process.argv[2]. This caused the denial reason
to be undefined when blocking commits with dead exports.

Author: carlos-alm

.claude/hooks/check-dead-exports.sh

@@ -137,7 +137,7 @@ if [ -n "$DEAD_EXPORTS" ]; then
       hookSpecificOutput: {
         hookEventName: 'PreToolUse',
         permissionDecision: 'deny',
-        permissionDecisionReason: process.argv[1]
+        permissionDecisionReason: process.argv[2]
       }
     }));
   " "$REASON"

docs/examples/claude-code-hooks/check-dead-exports.sh

@@ -137,7 +137,7 @@ if [ -n "$DEAD_EXPORTS" ]; then
       hookSpecificOutput: {
         hookEventName: 'PreToolUse',
         permissionDecision: 'deny',
-        permissionDecisionReason: process.argv[1]
+        permissionDecisionReason: process.argv[2]
       }
     }));
   " "$REASON"