Remove tool from context-pruner so it doesn't add a user prompt message.

Author: jahooma

.agents/context-pruner.ts

@@ -10,8 +10,6 @@ const definition: AgentDefinition = {
   displayName: 'Context Pruner',
   model: 'openai/gpt-5-mini',
 
-  toolNames: ['set_messages'],
-
   spawnerPrompt: `Spawn this agent between steps to prune context, starting with old tool results and then old messages.`,
 
   inputSchema: {