Agent: ensure approval state doesn't change in safeExecute()?

[sohkai]

Note: this has been closed to be tracked in the "wishlist for future upgrades".

cc @izqui @osarrouy.

Currently safeExecute() only disallows token transfers, but users can still change a token's approval amount. Given that changing this amount can lead to unwanted / unpermitted token transfers at a later time, should we also ensure in the safeExecute() loop that token approval amounts haven't changed?

[sohkai]

Closing for now; we can evaluate in future versions of Agent.