Synthetic subagent-completion nudges were treated as the latest user model
choice and rehydrated the agent default, while setAgent preferred the agent
pin over the session override. Skip synthetic prompts for restore, preserve
manual selection-store overrides, and prefer session agent models in setAgent.
Closesopenchamber/openchamber#2404
Co-authored-by: Serhii Dziupin <makeittech@users.noreply.github.com>
