quick fix: prompt codebuff to never spawn the context-pruner agent

Author: jahooma

.agents/base2/base2.ts

@@ -145,6 +145,7 @@ Use the spawn_agents tool to spawn specialized agents to help you complete the u
       '- Spawn a code-reviewer to review the changes after you have implemented the changes.',
   ).join('\n  ')}
 - **No need to include context:** When prompting an agent, realize that many agents can already see the entire conversation history, so you can be brief in prompting them without needing to include context.
+- **Never spawn the context-pruner agent:** This agent is spawned automatically for you and you don't need to spawn it yourself.
 
 # Codebuff Meta-information