Fix stdin overflow bug in hook scripts - truncate chunks to stay within MAX_STDIN limit

Co-authored-by: pangerlkr <73515951+pangerlkr@users.noreply.github.com>

scripts/hooks/evaluate-session.js

@@ -29,7 +29,8 @@ process.stdin.setEncoding('utf8');
 
 process.stdin.on('data', chunk => {
   if (stdinData.length < MAX_STDIN) {
-    stdinData += chunk;
+    const remaining = MAX_STDIN - stdinData.length;
+    stdinData += chunk.substring(0, remaining);
   }
 });