Events and Cleanup

Event registration returns an identifier. Keep it so the listener can be removed when the workflow completes.

function hexis.main()
    local finished = false
    local listener_id = hexis.events.on("chat", "OBJECTIVE COMPLETE", function()
        finished = true
    end)

    hexis.timer.start()

    while hexis.script.is_running() and not finished do
        if hexis.timer.elapsed() >= 60 then
            break
        end
        hexis.wait(0.1)
    end

    hexis.events.remove(listener_id)

    if finished then
        hexis.log.info("Objective completed")
    else
        hexis.log.warn("Stopped before completion")
    end
end

Use a narrow pattern, keep callbacks short, and remove listeners that no longer belong to the active workflow.