The proactive.autoEnable setting (which controlled whether autonomous background operation was auto-activated at launch) has been removed. The /proactive alias for /loop replaces the previous configuration approach.
Evidence
Setting removed (search for "autoEnable" near proactive in old file only)
Strings lifted out of the shipped bundle, so the claim above can be checked against them.
How sure we are
One source agreesOne thing we can check says the same as this entry.
Anthropic's release notes agree/proactive is now an alias for /loop
