fix: add Technically Unsupported section to SCOPE.md (#1295)
## Summary
**Goal of this PR**
Add an **"In-scope — technically not supported"** section to `SCOPE.md`.
This clarifies hardware/UX limitations (e.g., clock support) and is
intended to reduce recurring feature requests on topics already
discussed.
Based on discussions in #287 and #626.
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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? _**< NO >**_
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