fix(delegate-task): make plan agent categories/skills dynamic

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

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

src/agents/dynamic-agent-prompt-builder.ts

@@ -20,6 +20,7 @@ export interface AvailableSkill {
 export interface AvailableCategory {
   name: string
   description: string
+  model?: string
 }
 
 export function categorizeTools(toolNames: string[]): AvailableTool[] {