Summary and caveats section

[tremho]

Summary and Caveats

There is already a general placeholder meant for summary and conclusions, but specific attention should be given to some best practices, including notes on binary sizes from a Rust build.
This will take some notes from Kurtis's white-paper and other materials, specifically pointing to the best practices and caveats surrounding generics and embassy tasks (despite the use of these in many of the book examples).

[tremho]

Included as part of the "Wrap Up" PR (not yet posted)