Finalize `subagentDelegation` recipe

[muenzpraeger]

Summary

https://github.com/trailheadapps/agent-script-recipes/tree/main/force-app/future_recipes/subagentDelegation

Suggested Solution

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Alternative Solutions

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Code of Conduct

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[seanryankeegan]

Renamed from topicDelegation to subagentDelegation as part of the Spring '26 AgentScript terminology update (PR #82), which aligned all recipe names and keywords with the official Agentforce vocabulary (topic → subagent, topic_selector → agent_router).