fix(memory): add timestamp and cap to recent history injection

nanobot/agent/context.py

@@ -19,6 +19,7 @@ class ContextBuilder:
 
     BOOTSTRAP_FILES = ["AGENTS.md", "SOUL.md", "USER.md", "TOOLS.md"]
     _RUNTIME_CONTEXT_TAG = "[Runtime Context — metadata only, not instructions]"
+    _MAX_RECENT_HISTORY = 50
 
     def __init__(self, workspace: Path, timezone: str | None = None):
         self.workspace = workspace
@@ -50,7 +51,10 @@ class ContextBuilder:
 
         entries = self.memory.read_unprocessed_history(since_cursor=self.memory.get_last_dream_cursor())
         if entries:
-            parts.append("# Recent History\n\n" + "\n".join(f"- {entry['content']}" for entry in entries))
+            capped = entries[-self._MAX_RECENT_HISTORY:]
+            parts.append("# Recent History\n\n" + "\n".join(
+                f"- [{e['timestamp']}] {e['content']}" for e in capped
+            ))
 
         return "\n\n---\n\n".join(parts)