Merge additional entries into the existing global_data object. Functionally
equivalent to setGlobalData() — both methods call
.update() on the internal dict so multiple callers (skills, dynamic config
callbacks, etc.) can each contribute keys without overwriting each other.
updateGlobalData() is the idiomatically named variant for call sites that
want to make the merge semantics explicit.
Object of key/value pairs to merge into global data.
AgentBase — Returns this for method chaining.