🐛 fix(memory): require newline after context tag

agent/memory_manager.py

@@ -126,7 +126,10 @@ class StreamingContextScrubber:
                 idx = self._find_boundary_open_tag(buf)
                 if idx == -1:
                     # No open tag — hold back a potential partial open tag
-                    held = self._max_partial_suffix(buf, self._OPEN_TAG)
+                    held = (
+                        self._max_pending_open_suffix(buf)
+                        or self._max_partial_suffix(buf, self._OPEN_TAG)
+                    )
                     if held:
                         self._append_visible(out, buf[:-held])
                         self._buf = buf[-held:]
@@ -179,10 +182,25 @@ class StreamingContextScrubber:
             idx = buf_lower.find(self._OPEN_TAG, search_start)
             if idx == -1:
                 return -1
-            if self._is_block_boundary(buf, idx):
+            if self._is_block_boundary(buf, idx) and self._has_block_opener_suffix(buf, idx):
                 return idx
             search_start = idx + 1
 
+    def _max_pending_open_suffix(self, buf: str) -> int:
+        """Hold a complete boundary tag until the following char confirms it."""
+        if not buf.lower().endswith(self._OPEN_TAG):
+            return 0
+        idx = len(buf) - len(self._OPEN_TAG)
+        if not self._is_block_boundary(buf, idx):
+            return 0
+        return len(self._OPEN_TAG)
+
+    def _has_block_opener_suffix(self, buf: str, idx: int) -> bool:
+        after_idx = idx + len(self._OPEN_TAG)
+        if after_idx >= len(buf):
+            return False
+        return buf[after_idx] in "\r\n"
+
     def _is_block_boundary(self, buf: str, idx: int) -> bool:
         if idx == 0:
             return self._at_block_boundary