Updates

vendor/agent-harness/lib/repeat-loop.js

@@ -0,0 +1,45 @@
+/**
+ * Detect and collapse degenerate generation loops. No Bare imports.
+ *
+ * Small Qwen runs with no predict cap will repeat a clause until the idle
+ * timeout. Catch the repeating tail and stop the stream.
+ */
+
+function repeatingUnit(text, minLen, copies) {
+  const s = String(text || '');
+  const min = minLen > 0 ? minLen : 24;
+  const need = copies > 0 ? copies : 3;
+  if (s.length < min * need) return '';
+  const window = s.length > 2400 ? s.slice(-2400) : s;
+  const maxLen = Math.min(180, Math.floor(window.length / need));
+  for (let len = min; len <= maxLen; len++) {
+    const unit = window.slice(-len);
+    if (unit.replace(/\s+/g, '').length < 12) continue;
+    let matched = true;
+    for (let i = 2; i <= need; i++) {
+      if (window.slice(-len * i, -len * (i - 1)) !== unit) {
+        matched = false;
+        break;
+      }
+    }
+    if (matched) return unit;
+  }
+  return '';
+}
+
+function isRepeating(text) {
+  return !!repeatingUnit(text);
+}
+
+function escapeRe(value) {
+  return String(value).replace(/[.*+?^${}()|[\]\\]/g, '\\$&');
+}
+
+function collapseRepeats(text) {
+  const s = String(text || '');
+  const unit = repeatingUnit(s);
+  if (!unit) return s.trim();
+  return s.replace(new RegExp('(?:' + escapeRe(unit) + '){3,}$'), unit).trim();
+}
+
+module.exports = { repeatingUnit, isRepeating, collapseRepeats };