fix(agents): allow Momus and Metis delegation

Keep Momus and Metis read-only for file edits while allowing task-based invocation for planning review workflows.

Ultraworked with [Sisyphus](https://github.com/code-yeongyu/oh-my-openagent)

Co-authored-by: Sisyphus <clio-agent@sisyphuslabs.ai>

src/agents/metis.ts

@@ -296,7 +296,6 @@ const metisRestrictions = createAgentToolRestrictions([
   "write",
   "edit",
   "apply_patch",
-  "task",
 ])
 
 export function createMetisAgent(model: string): AgentConfig {