Why is Mode specific to triggers ?

[K3UL]

I don't understand why the mode is restricted to the trigger type.
For example, why can't I use Agent Mode on a PR to do some automations silently ?

Moreover, you mention in your v1.0 vision that the mode should be auto-detected, and I think this should be an option (mode could have the values agent, tag, review, auto and would default to auto), because otherwise it will just goes further to break/prevent advanced automations.