fix(memory): preserve unprocessed dream history

nanobot/agent/memory.py

@@ -433,13 +433,33 @@ class MemoryStore:
         ]
 
     def compact_history(self) -> None:
-        """Drop oldest entries if the file exceeds *max_history_entries*."""
+        """Drop oldest processed entries without discarding pending Dream input."""
         if self.max_history_entries <= 0:
             return
         entries = self._read_entries()
         if len(entries) <= self.max_history_entries:
             return
-        kept = entries[-self.max_history_entries:]
+        last_dream_cursor = self.get_last_dream_cursor()
+        first_unprocessed = next(
+            (
+                index
+                for index, entry in enumerate(entries)
+                if (
+                    (cursor := self._valid_cursor(entry.get("cursor"))) is not None
+                    and cursor > last_dream_cursor
+                )
+            ),
+            len(entries),
+        )
+        keep_from = min(len(entries) - self.max_history_entries, first_unprocessed)
+        kept = entries[keep_from:]
+        if len(kept) > self.max_history_entries:
+            logger.warning(
+                "History compaction retained {} unprocessed entries beyond the configured "
+                "limit of {}",
+                len(kept),
+                self.max_history_entries,
+            )
         self._write_entries(kept)
 
     # -- JSONL helpers -------------------------------------------------------