## Summary
**What is the goal of this PR?**
Added overview and migration guide for ActivityManager changes in #1016.
Thanks for the suggestion, @drbourbon!
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### AI Usage
While CrossPoint doesn't have restrictions on AI tools in contributing,
please be transparent about their usage as it
helps set the right context for reviewers.
Did you use AI tools to help write this code? _**YES, fully written by
Claude 4.6**_
